Answers and Solutions to Text Problems

Size: px
Start display at page:

Download "Answers and Solutions to Text Problems"

Transcription

1 Chapter 6 Answers and Solutions 6 Answers and Solutions to Text Problems 6.1 A chemical change occurs when the atoms of the initial substances rearrange to form new substances. Chemical change is indicated by a change in properties of the reactants. For example, a rusting nail, souring milk, and a burning match are all chemical changes. a. physical: the shape changes, but not the substance. b. chemical: new substances form c. physical: water evaporates forming gaseous water d. chemical: the composition of the substances change to give new substances e. physical: water freezes f. chemical: new substances form 6.2 a. physical b. chemical c. physical d. chemical e. chemical f. physical 6.3 a. On the reactant side, there are two nitrogen atoms and four oxygen atoms. On the product side, there are two nitrogen atoms (2NO) and four oxygen atoms (2NO + O 2 ) b. On the reactant side, there are five carbon atoms (5C), two sulfur atoms (2SO 2 ), and four oxygen atoms (2SO 2 ). On the product side, there are five carbon atoms, two sulfur atoms, and four oxygen atoms c. On the reactant side, there are four carbon atoms, four hydrogen atoms, and ten oxygen atoms. On the product side, there are four carbon atoms, four hydrogen atoms, and ten oxygen atoms. d. On the reactant side, there are two nitrogen atoms, eight hydrogen atoms, and four oxygen atoms. On the product side, there are two nitrogen atoms, eight hydrogen atoms, and four oxygen atoms 6.4 a. On the reactant side, there are one carbon atom, four hydrogen atoms, and four oxygen atoms. On the product side, there are one carbon atom, four hydrogen atoms, and four oxygen atoms. b. On the reactant side, there are four phosphorus atoms, and ten oxygen atoms. On the product side, there are four phosphorus atoms, and ten oxygen atoms c. On the reactant side, there are ten nitrogen atoms, twelve hydrogen atoms, and six oxygen atoms. On the product side, there are ten nitrogen atoms, twelve hydrogen atoms, and six oxygen atoms. d. On the reactant side, there are six carbon atoms, eighteen oxygen atoms, and twelve hydrogen atoms. On the product side, there are six carbon atoms, eighteen oxygen atoms, and twelve hydrogen atoms 6.5 An equation is balanced when there are equal numbers of atoms of each element on the reactant as on the product side. a. not balanced b. balanced c. not balanced d. balanced 6.6 a. balanced b. balanced c. not balanced d. not balanced 6.7 a. There are two sodium atoms and two chlorine atoms on each side of the equation. b. There are three chlorine atoms, one phosphorus atom, and six hydrogen atoms on each side of the equation. c. There are four phosphorus atoms, sixteen oxygen atoms, and twelve hydrogen atoms on each side of the equation.

2 Chemical Reactions 6.8 a. There are four nitrogen atoms and six oxygen atoms. b. There are two aluminum atoms, three oxygen atoms, six hydrogen atoms, and six chlorine atoms. c. There are five carbon atoms, twelve hydrogen atoms, and sixteen oxygen atoms. 6.9 Place coefficients in front of formulas until you make the atoms of each element equal on each side of the equation. Try starting with the formula that has subscripts. a. N 2 + O 2 2NO b. 2HgO 2Hg + O 2 c. 4Fe + 3O 2 2Fe 2 O 3 d. 2Na + Cl 2 2NaCl e. 2Cu 2 O + O 2 4CuO 6.10 a. 2Al + 3Cl 2 2AlCl 3 b. P 4 + 5O 2 P 4 O 10 c. C 4 H 8 + 6O 2 4CO H 2 O d. Sb 2 S 3 + 6HCl 2SbCl 3 + 3H 2 S e. Fe 2 O 3 + 3C 2Fe + 3 CO 6.11 a. There are two NO 3 in the product. Balance by placing a 2 before AgNO 3. Mg + 2 AgNO 3 Mg(NO 3 ) Ag b. CuCO 3 CuO + CO 2 c. Start with the formula Al 2 (SO 4 ) 3. Balance the Al by writing 2 Al and balance the SO 4 2- by writing 3CuSO 4 + Al + 3CuSO 4 3Cu + Al 2 (SO 4 ) 3 d. Pb(NO 3 ) NaCl PbCl 2 + 2NaNO 3 e. 2 Al + 6 HCl 2 AlCl H a. Zn + H 2 SO 4 ZnSO 4 + H 2 b. 2Al + 3H 2 SO 4 Al 2 (SO 4 ) 3 + 3H 2 c. K 2 SO 4 + BaCl 2 BaSO 4 + 2KCl d. CaCO 3 CaO + CO 2 e. Al 2 (SO 4 ) 3 + 6KOH 2Al(OH) 3 + 3K 2 SO a. Decomposition. A single reactant splits into two simpler substances (elements). b. This is a single replacement reaction. I 2 in BaI 2 is replaced by Br a. Two elements unite to form a compound. b. The components in two reactants exchange places a. combination and combustion b. single replacement c. decomposition d. double replacement e. combustion f. decomposition g. double replacement h. combination and combustion 6.16 a. double replacement b. combination c. combustion d. double replacement e. combination and combustion f. single replacement g. decomposition h. double replacement 6.17 a. Combine the reactants to form a large compound: Mg + Cl 2 MgCl 2 b. Split the reactant to give simpler substances: 2 HBr H 2 + Br 2 c. Replace the Zn with Mg: Mg + Zn(NO 3 ) 2 Mg(NO 3 ) 2 + Zn d. Switch metals placing K + with NO 3 and Pb 2+ with S 2 : K 2 S + Pb(NO 3 ) 2 2KNO 3 + PbS e. Write the products CO 2 and H 2 O and balance: 2 C 2 H O 2 4 CO H 2 O

3 Chapter 6 Answers and Solutions 6.18 a. Ca + S CaS b. PbO 2 Pb + O 2 c. 2KI + Cl 2 2KCl + I 2 d. CuCl 2 + Na 2 S CuS + 2NaCl e. C 2 H 4 + 3O 2 2CO 2 + 2H 2 O 6.19 a. oxidation b. reduction c. oxidation d. reduction 6.20 a. oxidation b. reduction c. reduction d. oxidation 6.21 a. Zinc(Zn) is oxidized because it loses electrons to form Zn 2+ ; chlorine (Cl 2 ) is reduced b. Bromide ion (2Br - ) is oxidized to Br 0 2 ; chlorine (Cl 2 ) is reduced to 2 Cl - (gains electrons) c. Oxide ion (O 2-) is oxidized to O 0 2 (loses electrons); lead (II) ion Pb 2+ is reduced d. Sn 2+ ion is oxidized to Sn 4+ (loses electrons) ; Fe 3+ ion is reduced to Fe 2+ ( gains electrons) 6.22 a. Lithium is oxidized and fluorine is reduced b. Iodide ion is oxidized and chlorine is reduced c. Zinc is oxidized and copper (II) ion is reduced d. Iron is oxidized and copper (II) ion is reduced 6.23 a. Fe 3+ + e - Fe 2+ is a reduction. b. Fe 2+ Fe 3+ + e is an oxidation For chlorine to become chloride ion, each chlorine atom must gain an electron: Cl 2 + 2e 2Cl Thus the reaction is a reduction Because the linoleic acid adds hydrogen, the acid has been reduced a. Because the reaction of succinic acid involves the loss of hydrogen, the acid is oxidized. b. Because the reaction of the coenzyme FAD involves the addition of hydrogen, the coenzyme is reduced. c. Because an oxidation always accompanies a reduction, one would expect the reaction of succinic acid to occur along with the FAD reaction. d. Energy reactants products Reaction progress 6.28 a. The heat of reaction is the heat energy that is given off (or used up) during a reaction as a result of reactant(s) bonds being broken and product(s) bonds being formed. b. In an exothermic reaction, energy is given off because the products are lower in energy than the reactants. In an endothermic reaction, energy is absorbed in forming products with a higher energy than the reactants. c. Because energy is absorbed during an endothermic reaction, the products have a higher energy than the reactants. d. Energy products Energy of activation reactants Reaction progress

4 Chemical Reactions 6.29 a. exothermic; heat loss b. endothermic; heat gain c. exothermic; heat loss 6.30 a. The reaction is exothermic. b. The reaction is endothermic. c. The reaction is endothermic a. exothermic b. endothermic c. exothermic 6.32 a. The reaction is exothermic. b. The reaction is exothermic. c. The reaction is endothermic a. The rate of a reaction relates the speed at which reactants are transformed into products. b. Because more reactants will have the energy necessary to proceed to products, (the activation energy), at room temperature than at refrigerator temperatures, the rate of formation of mold will be higher at room temperature a. A catalyst provides an alternate reaction pathway with a lower activation energy, and thus more reactants will have the energy necessary to form products. This results in an increased rate of reaction. b. The use of pure oxygen increases the amount of reactant present, increasing the rate of oxygenation of hemoglobin in blood a. Addition of a reactant increases the reaction rate. b. Increasing the temperature increases the number of collisions with the energy of activation. The rate of reaction will be increased. c. Addition of a catalyst increases the reaction rate. d. Removal of reactant decreases the reaction rate a. Addition of a reactant increases the reaction rate. b. Lowering the temperature decreases the number of reactant molecules with the energy necessary for reaction to occur, (activation energy). The rate of reaction will be decreased. c. Removing reactant decreases the reaction rate. d. Addition of a catalyst increases the reaction rate In a reversible reaction, the forward reaction converts reactants to products and a reverse reaction converts products back to reactants again A reversible reaction reaches equilibrium when the rate of the forward reaction is equal to the rate of the reverse reaction, and the amounts of each species present remain constant a. Addition of a reactant pushes the reaction toward the product side. b. Addition of heat to an exothermic reaction pushes the reaction toward the reactant side. c. Removal of a product pulls the reaction toward the product side. d. Removal of a reactant pulls the reaction toward the reactant side a. Removal of a reactant pulls the reaction toward the reactant side in an attempt to reestablish b. Removing heat from an exothermic reaction pulls the reaction toward the product side in an attempt to re-establish c. Addition of a product pushes the reaction toward the reactant side in an attempt to reestablish d. Addition of a reactant pushes the reaction toward the product side in an attempt to reestablish

5 Chapter 6 Answers and Solutions 6.41 a. Addition of a reactant pushes the reaction toward the product side. b. Addition of a product pushes the reaction toward the reactant side. c. Addition of heat to an endothermic reaction pushes the reaction toward the product side. d. Removal of heat from an endothermic reaction pulls the reaction to the reactant side a. Addition of heat to an endothermic reaction pushes the reaction toward the product side in an attempt to re-establish b. Removal of heat from an endothermic reaction shifts the reaction toward the reactant side in an attempt to re-establish c. Removal of CO, which is a product, shifts the reaction toward the product side in an attempt to re-establish d. Addition of a reactant pushes the reaction toward the product side in an attempt to reestablish 6.43 As gaseous carbon dioxide escapes into the atmosphere, product is removed from the reaction system. According to LeChatelier s principle, the reaction will shift toward the product side in an attempt to re-establish However, the soda is open to the atmosphere and will continue to lose its carbonation More reactants must be consumed for the forward reaction s rate to increase. Because we obtain the reactant oxygen by breathing, our breathing rate must also increase a. 2Al + 3Cl 2 2AlCl 3 combination b. 2Fe + 3H 2 SO 4 Fe 2 (SO 4 ) H 2 single replacement c. 2AgNO 3 + H 2 S Ag 2 S + 2 HNO 3 double replacement d. Cl 2 + 2KI 2KCl + I 2 single replacement 6.46 a. 2NI 3 N 2 + 3I 2 decomposition b. 3Mg + N 2 Mg 3 N 2 combination c. 3Na 2 SO 4 + 2Al(OH) 3 Al 2 (SO 4 ) 3 + 6NaOH double replacement d. 2Fe + 6HCl 2FeCl 3 + 3H 2 single replacement 6.47 a. C 4 H O 2 4 CO H 2 O b. C 5 H O 2 5 CO H 2 O c. C 6 H 12 O O 2 6 CO H 2 O 6.48 a. 2C 2 H 6 + 7O 2 4CO 2 + 6H 2 O b. 2C 6 H 6 + 9O 2 6CO 2 + 6H 2 O c. 2C 3 H 8 O 3 + 7O 2 6CO 2 + 8H 2 O 6.49 a. Zn e Zn reduction b. Al Al e oxidation c. Pb Pb e oxidation d. Cl 2 + 2e 2Cl - reduction 6.50 a. S + Cl 2 SCl 2 b. Cl 2 + 2NaBr Br 2 + 2NaCl c. 2Al + Fe 2 O 3 Al 2 O 3 + 2Fe d. 2CuO + C 2Cu + CO a. S S e S oxidized; Cl 2 + 2e 2Cl Cl 2 reduced b. Cl 2 + 2e 2Cl Cl 2 reduced; 2Br Br 2 + 2e Br oxidized c. Al Al e Al oxidized; Fe e Fe Fe 3+ reduced d. Cu e Cu Cu 2+ reduced; C C e C oxidized

6 Chemical Reactions 6.52 Although gas will burn in the atmosphere, (as we have all seen in the lab and when using a gas stove), the activation energy must be provided to initiate the reaction. The energy provided by a lit match or by a spark is sufficient to initiate the combustion of gas N 2 (g) + 2O 2 (g) + heat 2NO 2 (g) a. Addition of heat will push the reaction to the right, which favors the formation of product, NO 2. b. Removal of N 2 will pull the reaction to the left, forming more reactants. c. Addition of O 2 will push the reaction to the right, forming more NO 2 product. d. Removal of NO 2 would pull the reaction to the right, which forms more NO 2 product. e. Removing heat favors the reaction to the left, which forms more reactants A high activation energy would be difficult to attain, except for just a few of the reactants present, and the reaction would therefore be slow An increase in hemoglobin molecules pushes the reaction towards the products, which provides more oxygenated hemoglobin in the blood C 2 H 6 O + 3O 2 2CO 2 + 3H 2 O a. Addition of reactant(s) would increase the rate of reaction. b. Addition of a catalyst would also increase the rate of reaction.

Balancing Equations Notes

Balancing Equations Notes . Unit 9 Chemical Equations and Reactions What is a Chemical Equation? A Chemical Equation is a written representation of the process that occurs in a chemical reaction. A chemical equation is written

More information

Balancing Equations Notes

Balancing Equations Notes Unit 7 Chemical Equations and Reactions What is a Chemical Equation? A Chemical Equation is a written representation of the process that occurs in a chemical reaction. A chemical equation is written with

More information

Do Now CHEMICAL REACTIONS. Chemical Reaction. chemical reaction. Chemical Equations. Evidence

Do Now CHEMICAL REACTIONS. Chemical Reaction. chemical reaction. Chemical Equations. Evidence Do Now CHEMICAL REACTIONS What are some signs that a chemical change may have taken place? Where are the reactants and products in a reaction? What do they represent? Describe the law of conservation of

More information

Reaction Type & Balancing Review Questions

Reaction Type & Balancing Review Questions Reaction Type & Balancing Review Questions There are 20 questions sets in this review. The corresponding answers can be found in the second half of this document. 1. Match the term with its proper description.

More information

CHM1 Review for Exam 9

CHM1 Review for Exam 9 Topics 1. Reaction Types a. Combustion b. Synthesis c. Decomposition d. Single replacement i. Metal activity series ii. Nonmetal activity series e. Double replacement i. Precipitates and solubility rules

More information

AP Chem Unit 1 Assignment 3 Chemical Equations

AP Chem Unit 1 Assignment 3 Chemical Equations Symbols used in chemical equations: Symbol Meaning + used to separate one reactant or product from another used to separate the reactants from the products - it is pronounced "yields" or "produces" when

More information

Ch 8 Notes: Chemical Equations and Reactions

Ch 8 Notes: Chemical Equations and Reactions Name: Ch 8 Notes: Chemical Equations and Reactions I. Chemical Equations A properly written chemical equation can summarize any chemical change. The following requirements will help you write and read

More information

The formation of a gas is evidence of. 1. A chemical change. 2. A physical change. 3. No change in energy 4. Both (1) and (2)

The formation of a gas is evidence of. 1. A chemical change. 2. A physical change. 3. No change in energy 4. Both (1) and (2) Chapter 8 Review The formation of a gas is evidence of 1. A chemical change. 2. A physical change. 3. No change in energy 4. Both (1) and (2) The formation of a gas is evidence of 1. A chemical change.

More information

2. In a double displacement reaction, 3. In the chemical equation, H 2 O 2 H 2 + O 2, the H 2 O 2 is a

2. In a double displacement reaction, 3. In the chemical equation, H 2 O 2 H 2 + O 2, the H 2 O 2 is a What are the missing coefficients for the skeleton equation below? Al 2 (SO 4 ) 3 + KOH Al(OH) 3 + K 2 SO 4 2. In a double displacement reaction, A. 1,6,2,3 B. 2,12,4,6 C. 1,3,2,3 D. 4,6,2,3 E. 2,3,1,1

More information

Balancing Chemical Equations Worksheet

Balancing Chemical Equations Worksheet Balancing Chemical Equations Worksheet Student Instructions 1. Identify the reactants and products and write a word equation. 2. Write the correct chemical formula for each of the reactants and the products.

More information

Chapter 5 Chemical Quantities and Reactions

Chapter 5 Chemical Quantities and Reactions Chapter 5 Chemical Quantities and Reactions 1 Avogadro's Number Small particles such as atoms, molecules, and ions are counted using the mole. 1 mole = 6.02 x 10 23 items Avogadro s number 602 000 000

More information

Chapter 8 Chemical Equations and Reactions

Chapter 8 Chemical Equations and Reactions Chapter 8 Chemical Equations and Reactions 1 Section 8.1 Objectives: List 3 observations that suggest that a chemical reaction has taken place. List 3 requirements for a correctly written chemical reaction.

More information

Steps to Predicting the Products of Chemical Reactions. CP Chemistry

Steps to Predicting the Products of Chemical Reactions. CP Chemistry Steps to Predicting the Products of Chemical Reactions CP Chemistry TYPES OF REACTIONS REVIEW 2 NaNO 3 + PbO Pb(NO 3 ) 2 + Na 2 O C 2 H 4 O 2 + 2 O 2 2 CO 2 + 2 H 2 O ZnSO 4 + Li 2 CO 3 ZnCO 3 + Li 2 SO

More information

Potassium + Chlorine. K(s) + Cl 2 (g) 2 KCl(s)

Potassium + Chlorine. K(s) + Cl 2 (g) 2 KCl(s) Types of Reactions Consider for a moment the number of possible chemical reactions. Because there are millions of chemical compounds, it is logical to expect that there are millions of possible chemical

More information

Name Class Date. Step 3: Write the equation using formulas for the elements and compounds in the word equation. Al CuCl 2 : AlCl 3 Cu

Name Class Date. Step 3: Write the equation using formulas for the elements and compounds in the word equation. Al CuCl 2 : AlCl 3 Cu Skills Worksheet Math Skills Balancing Chemical Equations After you study each sample problem and solution, work out the practice problems on a separate sheet of paper. Write your answers in the spaces

More information

CHEMICAL REACTIONS. Chemistry 51 Chapter 6

CHEMICAL REACTIONS. Chemistry 51 Chapter 6 CHEMICAL REACTIONS A chemical reaction is a rearrangement of atoms in which some of the original bonds are broken and new bonds are formed to give different chemical structures. In a chemical reaction,

More information

Types of Chemical Reactions (rxns.)

Types of Chemical Reactions (rxns.) Types of Chemical Reactions (rxns.) Chemical reactions occur when bonds (between the electrons of atoms) are formed or broken Chemical reactions involve l changes in the chemical composition of matter

More information

Identify the letter of the choice that best completes the statement or answers the question.

Identify the letter of the choice that best completes the statement or answers the question. Chemistry Test - Chapter 10 Chemical Equations Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. 1. When balancing a chemical equation, insert

More information

Chapter 9. Answers to Questions

Chapter 9. Answers to Questions Chapter 9 Answers to Questions 1. Word equation: Silicon Tetrachloride + Water Silicon Dioxide + Hydrogen Chloride Formulas: Next, the chemical formulas are needed. As these are all covalent compounds,

More information

Chemistry Continuing Practice Packet

Chemistry Continuing Practice Packet Chemistry Continuing Practice Packet Mrs. Andrechek Webberville High School The best way to learn and remember chemistry is to practice. Check out the following websites: http://www.chemistrylecturenotes.com

More information

Chemical Reactions and Equations. Chapter 8

Chemical Reactions and Equations. Chapter 8 Chemical Reactions and Equations Chapter 8 Describing Chemical Reactions A chemical reaction is the process by which one or more substances are changed into different substances Reactants Products When

More information

Chapter 8 Review and Study Guide

Chapter 8 Review and Study Guide Name: Class: Date: Chapter 8 Review and Study Guide Multiple Choice Identify the choice that best completes the statement or answers the question. 1. Knowledge about what products are produced in a chemical

More information

CP Chapter 12 Stoichiometry

CP Chapter 12 Stoichiometry CP Chapter 12 Stoichiometry What is Stoichiometry? ( STOY-KEE-AHM-EH-TREE) Stoichiometry is the part of chemistry that studies amounts of reactants and products that are involved in reactions. Chemists

More information

Chapter 7: Chemical Equations. Name: Date: Period:

Chapter 7: Chemical Equations. Name: Date: Period: Chapter 7: Chemical Equations Name: Date: Period: 7-1 What is a chemical reaction? Read pages 232-237 a) Explain what a chemical reaction is. b) Distinguish between evidence that suggests a chemical reaction

More information

Types of Reactions. CK12 Editor. Say Thanks to the Authors Click (No sign in required)

Types of Reactions. CK12 Editor. Say Thanks to the Authors Click  (No sign in required) Types of Reactions CK12 Editor Say Thanks to the Authors Click http://www.ck12.org/saythanks (No sign in required) To access a customizable version of this book, as well as other interactive content, visit

More information

Answers to Practice Problems 6.1, p Answers to Practice Problems 6.2, p. 227

Answers to Practice Problems 6.1, p Answers to Practice Problems 6.2, p. 227 Answers to Practice Problems 6.1, p. 226 1. This is a synthesis reaction (between a metal and a non-metal). The balanced chemical equation is: 2Li + Cl 2 2LiCl. 2. This is a synthesis reaction (between

More information

CP Chapter 11 Notes Reactions and Equations

CP Chapter 11 Notes Reactions and Equations CP Chapter 11 Notes Reactions and Equations Evidence of Chemical Reactions How can you tell a reaction has taken place? Temperature change Color change Gas/bubbles Appearance of a (precipitate) Chemical

More information

Chemistry Continuing Practice Packet

Chemistry Continuing Practice Packet Chemistry Continuing Practice Packet Mrs. Andrechek Webberville High School The best way to learn and remember chemistry is to practice. Check out the following apps: - Mahjong Chem - Formulas Lite - Atoms

More information

Bal Bharati Public School, Pitampura

Bal Bharati Public School, Pitampura Bal Bharati Public School, Pitampura CLASS X CHEMISTRY ASSIGNM Chemical Reactions and Equations Science Notes TERM I 2013-2014 What is a Reaction? Reaction is a term used for depicting a change or transformation

More information

Tutorial 7 HEATS OF REACTION

Tutorial 7 HEATS OF REACTION T-54 Tutorial 7 HEATS OF REACTION In a chemical reaction bonds are broken in the reactants and new bonds formed in the products. Energy is required to break bonds and energy is released when bonds are

More information

Types of Chemical Reactions

Types of Chemical Reactions Why? Types of Chemical Reactions Do atoms rearrange in predictable patterns during chemical reactions? Recognizing patterns allows us to predict future behavior. Weather experts use patterns to predict

More information

Steps for balancing a chemical equation

Steps for balancing a chemical equation The Chemical Equation: A Chemical Recipe Dr. Gergens - SD Mesa College A. Learn the meaning of these arrows. B. The chemical equation is the shorthand notation for a chemical reaction. A chemical equation

More information

Ch. 9 Chemical Reactions

Ch. 9 Chemical Reactions Ch. 9 Chemical Reactions I. Intro to Reactions (p. 282 285) I II III IV V Chemical Reaction Chemical change Atoms of one or more substances (reactants) are rearranged into new substances (products) Signs

More information

Unit 8: Chemical Reactions and Equations

Unit 8: Chemical Reactions and Equations 1 Chemical Reactions Unit 8: Chemical Reactions and Equations What are chemical reactions and how do they occur? How are chemical reactions classified? How are products of chemical reactions predicted?

More information

Chemical Bonds & Reactions

Chemical Bonds & Reactions Chemical Bonds & Reactions Chemical Bond A force of attraction that holds two atoms together Has a significant effect on chemical and physical properties of compounds involves the valence electrons Valence

More information

STOICHOMETRY UNIT Determine the mass of carbon present in a sample of glucose weighing 5.4 g.

STOICHOMETRY UNIT Determine the mass of carbon present in a sample of glucose weighing 5.4 g. PERCENTAGE COMPOSITION STOICHOMETRY UNIT 3 1. A sample of magnesium weighing 2.246 g burns in oxygen to form 3.724 g of magnesium oxide. What are the percentages of magnesium and oxygen in magnesium oxide?

More information

Chapter 5. Chemical Reactions and Equations. Introduction. Chapter 5 Topics. 5.1 What is a Chemical Reaction

Chapter 5. Chemical Reactions and Equations. Introduction. Chapter 5 Topics. 5.1 What is a Chemical Reaction Introduction Chapter 5 Chemical Reactions and Equations Chemical reactions occur all around us. How do we make sense of these changes? What patterns can we find? 1 2 Copyright The McGraw-Hill Companies,

More information

CHEMICAL REACTIONS. When sodium bicarbonate, e.g. baking soda, is combined with an acid, a gas is produced

CHEMICAL REACTIONS. When sodium bicarbonate, e.g. baking soda, is combined with an acid, a gas is produced CHEMICAL REACTIONS OBJECTIVES 1. To study reactions between ions in aqueous solutions 2. To observe exothermic and endothermic reactions 3. To study oxidation-reduction reactions 4. To practice balancing

More information

Section 7.1 Describing Reactions (pages )

Section 7.1 Describing Reactions (pages ) Section 7.1 Describing Reactions (pages 192 198) This section discusses the use of chemical equations and how to balance them. It also demonstrates the use of calculations in chemistry. Reading Strategy

More information

5. Which of the following reactions is a nonredox decomposition reaction? A) 2CuO 2Cu + O2 B) 2KClO3 2KCl + 3 O2 C) CaCO3 CaO + CO2 D) SO2 + H2O H2SO3

5. Which of the following reactions is a nonredox decomposition reaction? A) 2CuO 2Cu + O2 B) 2KClO3 2KCl + 3 O2 C) CaCO3 CaO + CO2 D) SO2 + H2O H2SO3 CHEM 120 Online Course Chapter 9. Date: 1. Which of the following general reaction types is characterized by there being a single reactant? A) combination B) decomposition C) single-replacement D) double-replacement

More information

1. Sb + Cl 2 SbCl Mg + O 2 MgO _. 3. CaCl 2 Ca + Cl NaClO 3 NaCl + O Fe + HCl FeCl 2 + H CuO + H 2 Cu + H 2 O

1. Sb + Cl 2 SbCl Mg + O 2 MgO _. 3. CaCl 2 Ca + Cl NaClO 3 NaCl + O Fe + HCl FeCl 2 + H CuO + H 2 Cu + H 2 O Year 11 Chemistry Balancing Equations 1. Sb + Cl 2 SbCl 3 2. Mg + O 2 MgO _ 3. CaCl 2 Ca + Cl 2 4. NaClO 3 NaCl + O 2 5. Fe + HCl FeCl 2 + H 2 6. CuO + H 2 Cu + H 2 O 7. Al + H 2 SO 4 Al 2 (SO 4 ) 3 +

More information

Chapter 8 - Chemical Equations and Reactions

Chapter 8 - Chemical Equations and Reactions Chapter 8 - Chemical Equations and Reactions 8-1 Describing Chemical Reactions I. Introduction A. Reactants 1. Original substances entering into a chemical rxn B. Products 1. The resulting substances from

More information

David A. Katz Chemist, Educator, Science Communicator, and Consultant Department of Chemistry, Pima Community College

David A. Katz Chemist, Educator, Science Communicator, and Consultant Department of Chemistry, Pima Community College WRITING CHEMICAL EQUATIONS 2004, 2002, 1989 by David A. Katz. All rights reserved. Permission for classroom used provided original copyright is included. David A. Katz Chemist, Educator, Science Communicator,

More information

Chemistry 51 Chapter 6 CHEMICAL REACTIONS

Chemistry 51 Chapter 6 CHEMICAL REACTIONS CHEMICAL REACTIONS A chemical reaction is a rearrangement of atoms in which some of the original bonds are broken and new bonds are formed to give different chemical structures. In a chemical reaction,

More information

Unit 10A Stoichiometry Notes

Unit 10A Stoichiometry Notes Unit 10A Stoichiometry Notes Stoichiometry is a big word for a process that chemist s use to calculate amounts in reactions. It makes use of the coefficient ratio set up by balanced reaction equations

More information

USEFUL DEFINITIONS. A substance which cannot be split into anything simpler by chemical means.

USEFUL DEFINITIONS. A substance which cannot be split into anything simpler by chemical means. Formulae and equations 1 USEFUL DEFINITIONS Element Atom A substance which cannot be split into anything simpler by chemical means. The smallest part of an element that can take part in a chemical reaction.

More information

Part I: Parts and Meaning of a Chemical Equation:

Part I: Parts and Meaning of a Chemical Equation: Chemical Equations Name: Period: Date: Part I: Parts and Meaning of a Chemical Equation: 1) = process by which one or more substances are changed into one or more different substances (atoms are rearranged)

More information

USEFUL DEFINITIONS. A substance which cannot be split into anything simpler by chemical means.

USEFUL DEFINITIONS. A substance which cannot be split into anything simpler by chemical means. 1 USEFUL DEFINITIONS Element Atom Molecule A substance which cannot be split into anything simpler by chemical means. The smallest part of an element that can take part in a chemical reaction. The smallest

More information

Writing and Balancing Chemical Equations

Writing and Balancing Chemical Equations Name Writing and Balancing Chemical Equations Period When a substance undergoes a chemical reaction, chemical bonds are broken and new bonds are formed. This results in one or more new substances, often

More information

Balancing Chemical Equations

Balancing Chemical Equations Balancing Chemical Equations 1. sodium carbonate + calcium hydroxide sodium hydroxide + calcium carbonate Na 2 CO 3 + Ca(OH) 2 2 NaOH + CaCO 3 2. carbon dioxide + water carbonic acid CO 2 + H 2 O H 2 CO

More information

All Reactants All Products

All Reactants All Products 6.1: Describing Chemical Reactions page 225 Chemists use word equations to describe a wide variety of chemical reactions, simple and complicated, that occur everyday. In a chemical reaction, one or more

More information

(3) AgCl(s) Ag + (aq) + Cl (aq) (4) 2 HgO(s) 2 Hg( ) + O 2. A(g) + B(g) AB(g) 2 SO 2 (g) + O 2 (g) 2 SO 3 (g)

(3) AgCl(s) Ag + (aq) + Cl (aq) (4) 2 HgO(s) 2 Hg( ) + O 2. A(g) + B(g) AB(g) 2 SO 2 (g) + O 2 (g) 2 SO 3 (g) 1. Given the reaction at equilibrium: H 2 + Cl 2 2 HCl As the pressure s at constant temperature, the number of moles of HCl (1) s (3) remains the same (2) s 2. The Haber process is represented by the

More information

Classifying Chemical Reactions Chapter 7

Classifying Chemical Reactions Chapter 7 Classifying Chemical Reactions Chapter 7 Classifying Chemical Reactions Chemical reactions can be divided into five categories: I. Combination Reactions II. Decomposition Reactions III. Single-Replacement

More information

Unit 6: Reactions and Stoichiometry (Link to Prentice Hall Text: Chapters 7, 8 & 9)

Unit 6: Reactions and Stoichiometry (Link to Prentice Hall Text: Chapters 7, 8 & 9) R e a c t i o n s a n d S t o i c h i o m e t r y N o t e s P a g e 1 Unit 6: Reactions and Stoichiometry (Link to Prentice Hall Text: Chapters 7, 8 & 9) Name: Date Due Assignments Page Number: Problem

More information

Monday, October 15th. Today: Chapter Frequency: BB Pearson Education, Inc. Chapter 6, Section 1 1

Monday, October 15th. Today: Chapter Frequency: BB Pearson Education, Inc. Chapter 6, Section 1 1 Today: Chapter 6.1-6.4 Monday, October 15th Frequency: BB 2013 Pearson Education, Inc. Chapter 6, Section 1 1 Chemical Change- Section 6.1 A chemical change occurs when a substance is converted into one

More information

Balancing Chemical Equations

Balancing Chemical Equations Balancing Chemical Equations Aluminum reacts with copper(ii) chloride, CuCl 2, to form copper metal and aluminum chloride, AlCl 3 1. Identify the reactants and products. Aluminum and copper(ii) chloride

More information

Easy Examples: Hd 10 + Bu 8 HdBu. Introduction. (l) or (aq)? Introduction. Symbols. Yields or Produces. Balancing. (l) or (aq)?

Easy Examples: Hd 10 + Bu 8 HdBu. Introduction. (l) or (aq)? Introduction. Symbols. Yields or Produces. Balancing. (l) or (aq)? Chemical Equations Chemical Equations Like a recipe: Introduction Reactants Products 2H 2 (g) + O 2 (g) 2H 2 O(l) Symbols (s) (l) (aq) (g) Introduction Yields or Produces solid liquid aqueous gas (l) or

More information

Chemistry 20 Lesson 4 Chemical equations

Chemistry 20 Lesson 4 Chemical equations Chemistry 20 Lesson 4 Chemical equations I. Identifying chemical reactions In a chemical change, the compounds and/or elements we start off with are called the reactants, and the compounds and/or elements

More information

Chemical Equations. What is a chemical equation? How do you balance a chemical equation? How do you identify the type of chemical equation?

Chemical Equations. What is a chemical equation? How do you balance a chemical equation? How do you identify the type of chemical equation? Chemical Equations What is a chemical equation? How do you balance a chemical equation? How do you identify the type of chemical equation? Chemical Equations A chemical equation is written as an expression

More information

Chemical Reactions & Balancing Chemical Equations

Chemical Reactions & Balancing Chemical Equations Chemical Reactions & Balancing Chemical Equations Chemical Reactions A chemical reaction occurs when one or more materials turn into something different A balanced chemical equation describes what happens

More information

PS-4.2 Explain how the process of covalent bonding provides chemical stability through the sharing of electrons.

PS-4.2 Explain how the process of covalent bonding provides chemical stability through the sharing of electrons. PS-4.1 Explain the role of bonding in achieving chemical stability. All of the noble gases are chemically stable A noble gas electron configuration (an outside energy level with 2 or 8 electrons) is chemically

More information

Tutorial 5 NET IONIC EQUATIONS

Tutorial 5 NET IONIC EQUATIONS T-33 Tutorial 5 NET IONIC EQUATIONS The efficiency and extent of a chemical reaction is very much dependent upon the physical state (solid, liquid, gas, or solution) of reactants and products. Not surprisingly,

More information

Chapter 5 Chemical Quantities and Reactions. Collection Terms. 5.1 The Mole. A Mole of a Compound. A Mole of Atoms.

Chapter 5 Chemical Quantities and Reactions. Collection Terms. 5.1 The Mole. A Mole of a Compound. A Mole of Atoms. Chapter 5 Chemical Quantities and Reactions 5.1 The Mole Collection Terms A collection term states a specific number of items. 1 dozen donuts = 12 donuts 1 ream of paper = 500 sheets 1 case = 24 cans 1

More information

Chapter 6 Notes Science 10 Name:

Chapter 6 Notes Science 10 Name: 6.1 Types of Chemical Reactions a) Synthesis (A + B AB) Synthesis reactions are also known as reactions. When this occurs two or more reactants (usually elements) join to form a. A + B AB, where A and

More information

Unit 2. Molar Mass Worksheet

Unit 2. Molar Mass Worksheet Unit 2 Molar Mass Worksheet Calculate the molar masses of the following chemicals: 1) Cl 2 8) UF 6 2) KOH 9) SO 2 3) BeCl 2 10) H 3 PO 4 4) FeCl 3 11) (NH 4 ) 2 SO 4 5) BF 3 12) CH 3 COOH 6) CCl 2 F 2

More information

[Mg] +2 [ S ] -2. HONORS Chemical Bonds and the Chemical Reactions Study Guide KEY

[Mg] +2 [ S ] -2. HONORS Chemical Bonds and the Chemical Reactions Study Guide KEY HONORS Chemical Bonds and the Chemical Reactions Study Guide KEY Complete the following problems to help prepare for the test. Objective 1: Students will know ionic and covalent bonding. 1. Which subatomic

More information

Types of Chemical. Types of Reactions. Chapter 8 Chemical Reactions. Reactions. Synthesis Reactions. Synthesis Reactions. Synthesis Reactions

Types of Chemical. Types of Reactions. Chapter 8 Chemical Reactions. Reactions. Synthesis Reactions. Synthesis Reactions. Synthesis Reactions Chapter 8 Chemical Reactions Types of Chemical Reactions Types of Reactions There are six types of chemical reactions that you will learn about in this lesson: 1. Synthesis reactions 2. Decomposition reactions

More information

Chemical Equations and Chemical Reactions. Chapter 8.1

Chemical Equations and Chemical Reactions. Chapter 8.1 Chemical Equations and Chemical Reactions Chapter 8.1 Objectives List observations that suggest that a chemical reaction has taken place List the requirements for a correctly written chemical equation.

More information

SNC2D Chemistry Review

SNC2D Chemistry Review SNC2D Chemistry Review Name: Draw the Bohr-Rutherford diagram for each of the following atoms and determine the valence charge of their ions: Sodium: Aluminum: Sulfur: Fluorine: From your periodic table/chemistry

More information

Chemistry Themed. Types of Reactions

Chemistry Themed. Types of Reactions Chemistry Themed Types of Reactions 1 2 Chemistry in the Community-2015-2016 Types of Reactions Date In-Class Assignment Homework T 10/20 TEST on Reactivity of Metals and Redox None W 10/21 Late Start

More information

Practice Reaction Type and Predicting the Products

Practice Reaction Type and Predicting the Products Practice Reaction Type and Predicting the Products For each of the following: The first one is an example. a. Determine the TYPE of reaction by looking at your Reaction Type Sheets and write the type in

More information

Worksheet # 11. 4. When heated, nickel (II) carbonate undergoes a decomposition reaction. Write a balanced equation to describe this reaction

Worksheet # 11. 4. When heated, nickel (II) carbonate undergoes a decomposition reaction. Write a balanced equation to describe this reaction Worksheet # 11 1. A solution of sodium chloride is mixed with a solution of lead (II) nitrate. A precipitate of lead (II) chloride results, leaving a solution of sodium nitrated. Determine the class of

More information

13 Chemical Reactions

13 Chemical Reactions www.ck12.org 275 CHAPTER 13 Chemical Reactions CHAPTER OUTLINE 13.1 CHEMICAL REACTIONS AND EQUATIONS 13.2 BALANCING CHEMICAL EQUATIONS 13.3 TYPES OF REACTIONS CHAPTER 13. CHEMICAL REACTIONS 276 www.ck12.org

More information

Valence Electrons HELIUM ATOM LITHIUM ATOM. Helium has two valence electrons. Lithium has one valence electron

Valence Electrons HELIUM ATOM LITHIUM ATOM. Helium has two valence electrons. Lithium has one valence electron Valence Electrons LITHIUM ATOM HELIUM ATOM Lithium has one valence electron Helium has two valence electrons Oxidation Numbers 1+ + 3+ 4+ 3- - 1-0 Transistion metals - variable oxidation numbers Oxidation

More information

Unit 6. Naming Binary Compounds. Naming Binary Ionic Compounds - Type 1 1. The cation is always written first, then the anion.

Unit 6. Naming Binary Compounds. Naming Binary Ionic Compounds - Type 1 1. The cation is always written first, then the anion. Unit 6 Chemical Nomenclature and Chemical Reactions Naming Binary Compounds A binary compound is To properly name the binary compound you must first decide if it is ionic or covalent. How do you determine

More information

Oxidation-Reduction Reactions

Oxidation-Reduction Reactions Oxidation-Reduction Reactions What is an Oxidation-Reduction, or Redox, reaction? Oxidation-reduction reactions, or redox reactions, are technically defined as any chemical reaction in which the oxidation

More information

Types of Chemical Reactions Pre-Lab Assignment

Types of Chemical Reactions Pre-Lab Assignment Types of Chemical Reactions Pre-Lab Assignment Name Period Date The pre-lab is due at the beginning of the laboratory period 1. Read the entire procedure before beginning this pre-lab assignment. What

More information

Moles. Moles. Moles. Moles. Balancing Eqns. Balancing. Balancing Eqns. Symbols Yields or Produces. Like a recipe:

Moles. Moles. Moles. Moles. Balancing Eqns. Balancing. Balancing Eqns. Symbols Yields or Produces. Like a recipe: Like a recipe: Balancing Eqns Reactants Products 2H 2 (g) + O 2 (g) 2H 2 O(l) coefficients subscripts Balancing Eqns Balancing Symbols (s) (l) (aq) (g) or Yields or Produces solid liquid (pure liquid)

More information

Chemistry AS90171 Describe chemical reactions

Chemistry AS90171 Describe chemical reactions Chemistry AS90171 Describe chemical reactions This achievement standard involves the description of chemical reactions, including the carrying out of calculations. Achievement Merit Excellence Describe

More information

Chapter 8: Chemical Equations and Reactions

Chapter 8: Chemical Equations and Reactions Chapter 8: Chemical Equations and Reactions I. Describing Chemical Reactions A. A chemical reaction is the process by which one or more substances are changed into one or more different substances. A chemical

More information

Stoichiometry Review

Stoichiometry Review Stoichiometry Review There are 20 problems in this review set. Answers, including problem set-up, can be found in the second half of this document. 1. N 2 (g) + 3H 2 (g) --------> 2NH 3 (g) a. nitrogen

More information

Chemistry Final Exam Review

Chemistry Final Exam Review Name: Date: Block: Chemistry Final Exam Review 2012-2013 Unit 1: Measurement, Numbers, Scientific Notation, Conversions, Dimensional Analysis 1. Write 0.000008732 in scientific notation 8.732x10-6 2. Write

More information

SCH 4C1 Unit 2 Problem Set Questions taken from Frank Mustoe et all, "Chemistry 11", McGraw-Hill Ryerson, 2001

SCH 4C1 Unit 2 Problem Set Questions taken from Frank Mustoe et all, Chemistry 11, McGraw-Hill Ryerson, 2001 SCH 4C1 Unit 2 Problem Set Questions taken from Frank Mustoe et all, "Chemistry 11", McGraw-Hill Ryerson, 2001 1. A small pin contains 0.0178 mol of iron. How many atoms of iron are in the pin? 2. A sample

More information

Chapter 7 Chemical Reactions. Chemical & Physical Changes

Chapter 7 Chemical Reactions. Chemical & Physical Changes Chapter 7 Chemical Reactions Chemical & Physical Changes In a physical change, the chemical composition of the substance remains constant. Examples of physical changes are the melting of ice or the boiling

More information

Redox and Electrochemistry

Redox and Electrochemistry Name: Thursday, May 08, 2008 Redox and Electrochemistry 1. A diagram of a chemical cell and an equation are shown below. When the switch is closed, electrons will flow from 1. the Pb(s) to the Cu(s) 2+

More information

Problem Set #10 - Answers

Problem Set #10 - Answers Problem Set #10 - Answers BIG IDEAS Fill in the blanks or circle the correct response in brackets. 1) When a reaction occurs, the stuff you start with is called the _reactants_ and the stuff you end up

More information

1. Given the balanced equations representing two chemical reactions:

1. Given the balanced equations representing two chemical reactions: Name: 1. Given the balanced equations representing two chemical reactions: Cl2 + 2NaBr 2NaCl + Br 2 2NaCl 2Na + Cl2 Which type of chemical reactions are represented by these equations? A) single replacement

More information

2. DECOMPOSITION REACTION ( A couple have a heated argument and break up )

2. DECOMPOSITION REACTION ( A couple have a heated argument and break up ) TYPES OF CHEMICAL REACTIONS Most reactions can be classified into one of five categories by examining the types of reactants and products involved in the reaction. Knowing the types of reactions can help

More information

No Brain Too Small. Credits: Four

No Brain Too Small. Credits: Four No Brain Too Small Level 1 Science 2015 90944 Demonstrate understanding of aspects of acids and bases Credits: Four Achievement Achievement with Merit Achievement with Excellence Demonstrate understanding

More information

Name Class Date. Chapter: Chemical Equations and Reactions

Name Class Date. Chapter: Chemical Equations and Reactions Assessment Chapter Test A Chapter: Chemical Equations and Reactions In the space provided, write the letter of the term or phrase that best completes each statement or best answers each question. 1. You

More information

11.2 Types of Chemical Reactions> Chapter 11 Chemical Reactions Types of Chemical Reactions Describing Chemical Reactions

11.2 Types of Chemical Reactions> Chapter 11 Chemical Reactions Types of Chemical Reactions Describing Chemical Reactions Chapter 11 Chemical 11.1 Describing Chemical 11.2 Types of Chemical 11.3 in Aqueous Solution 1 CHEMISTRY & YOU What happens to the wax when you burn a candle? When you burn a candle, a chemical reaction

More information

Understanding Chemical Equations

Understanding Chemical Equations Connections Understanding Chemical Equations Have you ever... Seen the result of mixing baking soda and vinegar? Used friction to light a match? Seen a car eaten through by rust? Chemical equations model

More information

OXIDATION REDUCTION REACTIONS

OXIDATION REDUCTION REACTIONS OXIDATION REDUCTION REACTIONS Oxidation reduction (redox) reactions are reactions that involve transfer of electrons from one species to another. As an example: Net ionic equation: Fe (s) + CuSO 4 (aq)

More information

Experiment 17-Chemical Reactions Lab

Experiment 17-Chemical Reactions Lab Since the Middle Ages, when ancient physicians attempted to find a magical substance that would cure all diseases, humans have been fascinated with chemical reactions. In order to effectively describe

More information

Subscripts and Coefficients Give Different Information

Subscripts and Coefficients Give Different Information Chapter 3: Stoichiometry Goal is to understand and become proficient at working with: 1. Chemical equations (Balancing REVIEW) 2. Some simple patterns of reactivity 3. Formula weights (REVIEW) 4. Avogadro's

More information

Write chemical equations for the following reactions: Reactants Products Unbalanced. Water H 2 O. and

Write chemical equations for the following reactions: Reactants Products Unbalanced. Water H 2 O. and Chemical Equations 17.2 Chemical symbols provide us with a shorth method of writing the name of an element. Chemical formulas do the same for compounds. But what about chemical reactions? To write out,

More information

Chemical reactions. Classifications Reactions in solution Ionic equations

Chemical reactions. Classifications Reactions in solution Ionic equations Chemical reactions Classifications Reactions in solution Ionic equations Learning objectives Distinguish between chemical and physical change Write and balance chemical equations Describe concepts of oxidation

More information

CHAPTER 9 CALCULATIONS FROM CHEMICAL EQUATIONS SOLUTIONS TO REVIEW QUESTIONS. = 2 mol PH 3. a g b = 0.4 g PH. = 12 mol H 2 O.

CHAPTER 9 CALCULATIONS FROM CHEMICAL EQUATIONS SOLUTIONS TO REVIEW QUESTIONS. = 2 mol PH 3. a g b = 0.4 g PH. = 12 mol H 2 O. HEINS09-095-117v4.qxd 1/30/06 1:58 PM Page 95 CHAPTER 9 CALCULATIONS FROM CHEMICAL EQUATIONS SOLUTIONS TO REVIEW QUESTIONS 1. A e ratio is the ratio between the e amounts of two atoms and/or ecules involved

More information

Chapter 5 Chemical Reactions and Equations

Chapter 5 Chemical Reactions and Equations Chapter 5 Chemical Reactions and Equations 5.1 (a) single-displacement reaction; (b) anhydrous; (c) molecular equation; (d) decomposition reaction; (e) balanced equation; (f) reactant; (g) spectator ion;

More information

Chemical Reactions Chapter 8 Assignment & Problem Set

Chemical Reactions Chapter 8 Assignment & Problem Set Chemical Reactions Name Warm-Ups (Show your work for credit) Date 1. Date 2. Date 3. Date 4. Date 5. Date 6. Date 7. Date 8. Chemical Reactions 2 Study Guide: Things You Must Know Vocabulary (know the

More information