# 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

Save this PDF as:

Size: px
Start display at page:

Download "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"

## Transcription

1 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 provided. Problem Aluminum reacts with copper(ii) chloride, CuCl 2, to form copper metal and aluminum chloride, AlCl 3. Write the balanced equation for this reaction. Solution Step 1: Identify the reactants and products. Aluminum and copper(ii) chloride are the reactants, and aluminum chloride and copper are the products. Step 2: Write a word equation for the reaction. aluminum copper(ii) chloride : aluminum chloride copper Step 3: Write the equation using formulas for the elements and compounds in the word equation. Al CuCl 2 : AlCl 3 Cu Step 4: Balance the equation one element at a time. The same number of each type of atom must appear on both sides. So far, there are three chlorine atoms on the right and only two on the left. To balance the number of chlorine atoms, you must multiply the amount of copper(ii) chloride by 3 and multiply the amount of aluminum chloride by 2. Al 3CuCl 2 : 2AlCl 3 Cu Al 1 2 Cu 3 1 Cl 6 6 This equation gives you two aluminum atoms on the right and only one on the left. So you need to multiply the amount of aluminum by 2. 2Al 3CuCl 2 : 2AlCl 3 Cu Holt Science Spectrum 11 Chemical Reactions

2 Al 2 2 Cu 3 1 Cl 6 6 To balance the equation, multiply the amount of copper produced by 3. 2Al 3CuCl 2 : 2AlCl 3 3Cu Al 2 2 Cu 3 3 Cl 6 6 Practice 1. Combustion in automobile engines takes place when fuel and oxygen are combined and ignited in the cylinders of the engine. However, the air that provides the oxygen for combustion also introduces nitrogen into the engine. The nitrogen reacts with oxygen at the high temperatures present in the engine, producing nitrogen oxide compounds, which are a major component of smog. In one of these reactions, nitric oxide, NO, reacts with oxygen, O 2, to form nitrogen dioxide, NO 2. Write the balanced equation for this reaction. 2. During the centuries following the collapse of the western Roman Empire, marble (calcium carbonate, CaCO 3 ) was taken from the monuments of Rome and heated to form quicklime (calcium oxide, CaO), which was used to make plaster. Carbon dioxide, CO 2, was also produced in this decomposition reaction. Write the balanced equation for this reaction. 3. When a match is lit, sulfur (S 8 ) reacts with oxygen to release energy and form sulfur dioxide, SO 2. Write the balanced equation for this reaction. 4. Zinc reacts with water to produce zinc hydroxide, Zn(OH) 2, and molecular hydrogen gas, H 2. Write the balanced equation for this reaction. 5. Barium, Ba, reacts with sulfur, S 8, to form barium sulfide, BaS. Write the balanced equation for this synthesis reaction. Holt Science Spectrum 12 Chemical Reactions

3 6. Automobile airbags rely on the decomposition of the compound sodium azide (NaN 3 ) to produce the nitrogen gas, N 2, needed to rapidly inflate the bag. Sodium is also produced in the reaction. Write the balanced equation for this decomposition reaction. 7. A useful single-displacement reaction involves thermite, which is a mixture of aluminum and iron oxide, Fe 2 O 3. When the thermite reaches a high temperature, the components react to produce molten iron, aluminum oxide (Al 2 O 3 ), and a great deal of energy. Write the balanced equation for the thermite reaction. 8. Acid indigestion can occur when the stomach produces too much hydrochloric acid, HCl. An old and effective remedy for this involves drinking a solution of baking soda (sodium hydrogen carbonate, NaHCO 3 ), which reacts with the hydrochloric acid to produce sodium chloride (NaCl), water, and carbon dioxide. Write the balanced equation for this reaction. 9. A problem with the remedy given in problem 8 for acid indigestion is that the carbon dioxide produced can cause discomfort. In many modern antacids, the active ingredient is magnesium hydroxide, Mg(OH) 2. When this compound reacts with the hydrochloric acid, a double-displacement reaction occurs that produces only water and magnesium chloride, MgCl 2. Write the balanced equation for this reaction. Problem Write the equation that describes the formation of glucose and oxygen, by means of photosynthesis, from carbon dioxide and water. Solution Step 1: Identify the reactants and products. Carbon dioxide and water, the reactants, form glucose and oxygen, the products. Step 2: Write a word equation for the reaction. carbon dioxide water : glucose oxygen Step 3: Write the equation using formulas for the elements and compounds in the word equation. Some gaseous elements are molecules, not atoms. Oxygen in air is O 2, not O. CO 2 H 2 O : C 6 H 12 O 6 O 2 Holt Science Spectrum 13 Chemical Reactions

4 Step 4: Balance the equation one element at a time. The same number of each type of atom must appear on both sides. So far, there are six carbon atoms on the right and only one on the left. To balance the number of carbon atoms, multiply the amount of carbon dioxide by 6. 6CO 2 H 2 O : C 6 H 12 O 6 O 2 C 6 6 H 2 12 O 13 8 This equation gives you twelve hydrogen atoms on the right and only two on the left. So you need to multiply the amount of water by 6. 6CO 2 6H 2 O : C 6 H 12 O 6 O 2 C 6 6 H O 18 8 To balance the equation, multiply the amount of oxygen produced by 6. 6CO 2 6H 2 O : C 6 H 12 O 6 6O 2 C 6 6 H O Practice 10. Uranium reacts with fluorine gas, F 2, to form uranium(vi) fluoride, UF 6. Write the balanced equation for this synthesis reaction. 11. Iron reacts with chlorine gas, Cl 2, to form iron(iii) chloride, FeCl 3. Write the balanced equation for this synthesis reaction. 12. Aluminum sulfate, Al 2 (SO 4 ) 3, decomposes to form aluminum oxide, Al 2 O 3, and sulfur trioxide, SO 3. Write the balanced equation for this reaction. Holt Science Spectrum 14 Chemical Reactions

5 13. Water is decomposed by electrolysis to form the gaseous products hydrogen, H 2, and oxygen, O 2. Write the balanced equation for this reaction. 14. Potassium chlorate, KClO 3, decomposes to form potassium chloride, KCl, and oxygen gas. Write the balanced equation for this decomposition reaction. 15. Chlorine gas, Cl 2, reacts with potassium bromide, KBr, to form potassium chloride and bromine, Br 2. Write the balanced equation for this singledisplacement reaction. 16. Aluminum reacts with lead nitrate, Pb(NO 3 ) 2, to form lead and aluminum nitrate, Al(NO 3 ) 3. Write the balanced equation for this single-displacement reaction. 17. Ammonium chloride, NH 4 Cl, reacts with calcium hydroxide, Ca(OH) 2, to form calcium chloride, CaCl 2, ammonia, NH 3, and water. Write the balanced equation for this reaction. 18. Zinc reacts with hydrochloric acid, HCl, to form zinc chloride, ZnCl 2, and hydrogen gas. Write the balanced equation for this reaction. 19. Fluorine reacts with sodium chloride, NaCl, to form sodium fluoride, NaF, and chlorine. Write the balanced equation for this single-displacement reaction. (Hint: Remember that both fluorine and chlorine have two atoms per molecule when they are in elemental form.) 20. Calcium oxide, CaO, reacts with sulfur dioxide to form calcium sulfite, CaSO 3. Write the balanced equation for this synthesis reaction. 21. In air, calcium sulfite, CaSO 3, reacts slowly with oxygen to form calcium sulfate, CaSO 4. Write the balanced equation for this reaction. 22. When heated, mercury(ii) oxide, HgO, decomposes to form mercury and oxygen. Through this reaction, Joseph Priestley demonstrated the existence of oxygen in Write the balanced equation for the decomposition of mercury(ii) oxide. Holt Science Spectrum 15 Chemical Reactions

6 Mixed Practice 23. Potassium nitrate, KNO 3, decomposes to form potassium nitrite, KNO 2, and oxygen gas, O 2. Write the balanced equation for this decomposition reaction. 24. Antimony(V) chloride, SbCl 5, reacts with potassium iodide, KI, to form the products potassium chloride, KCl, iodine, I 2, and antimony(iii) chloride, SbCl 3. Write the balanced equation for this reaction. 25. Nitric acid, HNO 3, reacts with hydrogen sulfide, H 2 S, to form nitrogen dioxide, NO 2, water, and sulfur, S. Write the balanced equation for this reaction. 26. Chromium(III) oxide, Cr 2 O 3, reacts with silicon to form chromium metal and silicon dioxide, SiO 2. Write the balanced equation for this reaction. 27. Ammonium dichromate, (NH 4 ) 2 Cr 2 O 7, decomposes to form chromium(iii) oxide, Cr 2 O 3, nitrogen gas, N 2, and water. Write the balanced equation for this decomposition reaction. 28. Iron(II) chloride, FeCl 2, reacts with water at high temperatures to form triiron tetraoxide, Fe 3 O 4, hydrochloric acid, and hydrogen gas. Write the balanced equation for this reaction. 29. Aluminum sulfate, Al 2 (SO 4 ) 3, reacts with calcium hydroxide, Ca(OH) 2, to form aluminum hydroxide, Al(OH) 3, and calcium sulfate, CaSO 4. Write the balanced equation for this double-displacement reaction. 30. Lead chloride, PbCl 2, reacts with sodium chromate, Na 2 CrO 4, to form lead chromate, PbCrO 4, and sodium chloride, NaCl. Write the balanced equation for this double-displacement reaction. 31. Vanadium pentoxide, V 2 O 5, reacts with calcium to form vanadium metal and calcium oxide, CaO. Write the balanced equation for this reaction. Holt Science Spectrum 16 Chemical Reactions

7 TEACHER RESOURCE PAGE Science Skills BALANCING CHEMICAL EQUATIONS 1. No; the equation is not balanced because there are 2 N atoms on the left side and 1 N atoms on the right side, and 4 O atoms on the left side and 2 O atoms on the right side. 2. 2H 2 O 2 : 2H 2 O 3. CH 4 2O 2 : CO 2 2H 2 O 4. 4Fe 3O 2 : 2Fe 2 O 3 5. C 6 H 12 O 6 6O 2 : 6CO 2 6H 2 O 6. The equation is already balanced. RATIOS AND PROPORTIONS 1. 6 cups of water male teachers 3. x 600 Math Skills BALANCING CHEMICAL EQUATIONS 1. 2NO O 2 : 2NO 2 2. CaCO 3 : CaO CO 2 3. S 8 8O 2 : 8SO 2 4. Zn 2H 2 O : Zn(OH) 2 H Ba S 8 : 8BaS 6. 2NaN 3 : 2Na 3N Al Fe 2 O 3 : 2Fe Al 2 O 3 NaHCO 3 HCl : NaCl H 2 O CO 2 Mg(OH) 2 2HCl : MgCl 2 2H 2 O U 3F 2 : UF 6 2Fe 3Cl 2 : 2FeCl 3 Al 2 (SO 4 ) 3 : Al 2 O 3 3SO 3 2H 2 O : 2H 2 O 2 2KClO 3 : 2KCl 3O 2 2KBr Cl 2 : 2KCl Br 2 2Al 3Pb(NO 3 ) 2 : 3Pb 2Al(NO 3 ) 3 2NH 4 Cl Ca(OH) 2 : CaCl 2 2NH 3 2H 2 O Zn 2HCl : ZnCl 2 H 2 2NaCl F 2 : 2NaF Cl 2 CaO SO 2 : CaSO 3 2CaSO 3 O 2 : 2CaSO 4 2HgO : 2Hg O 2 2KNO 3 : 2KNO 2 O 2 SbCl 5 2KI : 2KCl I 2 SbCl 3 2HNO 3 H 2 S : 2NO 2 2H 2 O S 2Cr 2 O 3 3Si : 4Cr 3SiO 2 (NH 4 ) 2 Cr 2 O 7 : Cr 2 O 3 N 2 4H 2 O 3FeCl 2 4H 2 O : Fe 3 O 4 6HCl H 2 Al 2 (SO 4 ) 3 3Ca(OH) 2 : 2Al(OH) 3 3CaSO PbCl 2 Na 2 CrO 4 : PbCrO 4 2NaCl 31. V 2 O 5 5Ca : 2V 5CaO Holt Science Spectrum 89 Chemical Reactions

### 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

### 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.

### 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

### 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

### 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

### 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

### 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

### 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

### 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

### 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?

### 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

### What is a chemical reaction?

Chapter 5 Chemical Reactions and Equations What is a chemical reaction? How do we know a chemical reaction occurs? Writing chemical equations Predicting chemical reactions Representing reactions in aqueous

### 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

### Ch.4 Solutions. Solutions for Practice Problems p Consider the following reaction. 2H 2(g) + O 2(g) 2H 2 O (l)

Solutions for Practice Problems p. 114 Ch.4 Solutions 1. Consider the following reaction. 2H 2(g) + O 2(g) 2H 2 O (l) (a) Write the ratio of H 2 molecules: O 2 molecules: H 2 Omolecules. The ratio is given

### 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,

### 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)

### 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

### 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

### 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

### 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

### 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

### 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

### 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,

### WRITE IN THE CORRECT FORMULA THEN BALANCE THE CHEMICAL EQUATIONS

WRITE IN THE CORRECT FORMULA THEN BALANCE THE CHEMICAL EQUATIONS 1. Hydrogen Oxygen Water METALLIC OXIDE WATER BASE 2. Sodium oxide Water Sodium hydroxide 3. Calcium oxide Water Calcium hydroxide 4. Potassium

### 3. Calculate the number of grams of oxygen produced if 2.50 grams of potassium chlorate are decomposed completely by heating.

UNIT 9 - STOICHIOMETRY Stoichiometry Problems 1 Worksheet 1. When lead (II) sulfide is burned in air, lead (II) oxide and sulfur dioxide are produced. If 0.890 moles of sulfur dioxide were produced, how

### Answers and Solutions to Text Problems

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

### MOLE CONVERSION PROBLEMS. 2. How many moles are present in 34 grams of Cu(OH) 2? [0.35 moles]

MOLE CONVERSION PROBLEMS 1. What is the molar mass of MgO? [40.31 g/mol] 2. How many moles are present in 34 grams of Cu(OH) 2? [0.35 moles] 3. How many moles are present in 2.5 x 10 23 molecules of CH

### 2. Draw the Bohr-Rutherford diagrams for the following Ions: S 2-, Al +3, Li +1, P -3

1. Complete the following table: ATOMIC STRUCTURE Name Symbol # protons # neutrons # electrons Net charge Sodium ion Na +1 +1 Oxygen atom Gold ion +3 C Cl -1 Cesium ion +1 12 +2 16-2 18 +1 10 0 Ba +2 Helium

### 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

### Name Class Date. Chapter: Chemical Equations and Reactions

Assessment Chapter Test B Chapter: Chemical Equations and Reactions PART I In the space provided, write the letter of the term or phrase that best completes each statement or best answers each question

### Quantities in Chemical Reactions

Chapter Quantities in Chemical Reactions Note to teacher: You will notice that there are two different formats for the Sample Problems in the student textbook. Where appropriate, the Sample Problem contains

### Date: October 31, 2016 Objective: Name binary ionic compounds. Add ionic charges to your Periodic Table:

Do Now Date: October 31, 2016 Objective: Name binary ionic compounds. Add ionic charges to your Periodic Table: Quick practice Classify as ionic or covalent: CaCl 2 H 2 O KI NaCl Ca 2+ Ionic compounds

### 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

### 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

### 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

### 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

### 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

### 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

### MODERN CHEMISTRY. 8. What is the formula for aluminum sulfate? 9. What is the formula for barium hydroxide?

MODERN CHEMISTRY Date Name Period Multiple Choice - Identify the choice that best completes the statement or answers the question. Use answer-key worksheet (Page 6) to key in answers to questions. 1. A

### 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;

### 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,

### 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

### CHEMICAL EQUATIONS and REACTION TYPES

31 CHEMICAL EQUATIONS and REACTION TYPES The purpose of this laboratory exercise is to develop skills in writing and balancing chemical equations. The relevance of this exercise is illustrated by a series

### 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

### Combination Reactions 2H 2 + O 2 2H 2 O. 2Na + I 2 2NaI. Ca + Cl 2 CaCl 2. C + O 2 CO 2 or 2C + O 2 2CO 3H 2 + N 2 2NH 3

Combination Reactions Predict the product and write balanced reactions for each of the following. 1. Hydrogen burned in oxygen. 2H 2 + O 2 2H 2 O 2. Sodium plus iodine. 2Na + I 2 2NaI 3. Calcium burned

### 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.

### 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

### 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

### 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.

### 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

### Test 4: Equations and Math of Equations Review

Name: Tuesday, November 27, 2007 Test 4: Equations and Math of Equations Review 1. Given the balanced equation: 2KClO 2KCl + 3O 3 2 Which type of reaction is represented by this equation? 1. synthesis

### 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

### Unit 9 Stoichiometry Notes (The Mole Continues)

Unit 9 Stoichiometry Notes (The Mole Continues) 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

### Chapter 7. Answers to Questions

Chapter 7 Answers to Questions 1. (a) S 2 (b) Ca 2+ (c) I 2. (a) Al 3+ (b) P 3 (c) Sn 2+ 3. (a) cobalt(ii) (b) potassium (c) nitride 4. (a) fluoride (b) mercury(ii) (c) cadmium 5. (a) The sodium ion is

### 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

### 21 st Century Chemistry Multiple Choice Question in Topic 3 Metals Unit 11

21 st Century Chemistry Multiple Choice Question in Topic 3 Metals Unit 11 1. Consider the equation: 2Ca(s) + O 2 (g) 2CaO(s) Which of the following statements are correct? (1) Calcium and oxygen are reactants.

### 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.

### 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

### 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.

### Chemical Equations and Reactions

CHAPTER 8 Chemical Equations and Reactions The evolution of light and heat is an indication that a chemical reaction is taking place. Describing Chemical Reactions SECTION 8-1 OBJECTIVES List three observations

### 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

### FORMULA WRITNG. 17. Sodium Phosphate 18. Iron (III) Chloride. 19. Potassium Carbonate 20. Copper (I) Hypochlorite

FORMULA WRITNG Problem Set 8.1 Name: Hour: Date: Three basic rules in writing formulas: 1. Positive ion first, negative ion second. 2. Total positive charges much equal total negative charge. 3. The parentheses

### 4.3 Reaction Stoichiometry

196 Chapter 4 Stoichiometry of Chemical Reactions 4.3 Reaction Stoichiometry By the end of this section, you will be able to: Explain the concept of stoichiometry as it pertains to chemical reactions Use

### 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

### 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

### B. Elements: We cannot determine how many electrons are lost for the elements b/c their in their valence electrons can change.

Unit 6 Notepack: Chapters 9 &10 Chemical Quantities 9.1 Naming Ions NAME Period: A. ions: Ions made of single. B. Elements: There is a pattern in predicting how many electrons are lost and gained for the

### Oxidation-Reduction Reactions

Chapter 18 Oxidation-Reduction Reactions Note to teacher: You will notice that there are two different formats for the Sample Problems in the student textbook. Where appropriate, the Sample Problem contains

### AP Chemistry Prep - Summer Assignment 2013

AP Chemistry Prep - Summer Assignment 2013 Multiple Choice Identify the choice that best completes the statement or answers the question. 1. Which value has only 4 significant digits? a. 6.930 c. 8450

### Monatomic Ions. A. Monatomic Ions In order to determine the charge of monatomic ions, you can use the periodic table as a guide:

Monatomic Ions Ions are atoms that have either lost or gained electrons. While atoms are neutral, ions are charged particles. A loss of electrons results in a positive ion or cation (pronounced cat-eye-on

### WRITING CHEMICAL FORMULA

WRITING CHEMICAL FORMULA For ionic compounds, the chemical formula must be worked out. You will no longer have the list of ions in the exam (like at GCSE). Instead you must learn some and work out others.

### Chapter 3. Stoichiometry: Ratios of Combination. Insert picture from First page of chapter. Copyright McGraw-Hill 2009 1

Chapter 3 Insert picture from First page of chapter Stoichiometry: Ratios of Combination Copyright McGraw-Hill 2009 1 3.1 Molecular and Formula Masses Molecular mass - (molecular weight) The mass in amu

### Equation Writing. CO 2 + H 2 O H 2 CO 3 reactants products

Equation Writing A chemical equation is a concise shorthand expression which represents the relative amount of reactants and products involved in a chemical reaction. CO 2 + H 2 O H 2 CO 3 reactants products

### CHEM J-2 June /01(a) What is the molarity of the solution formed when 0.50 g of aluminium fluoride is dissolved in ml of water?

CHEM1001 2014-J-2 June 2014 22/01(a) What is the molarity of the solution formed when 0.50 g of aluminium fluoride is dissolved in 800.0 ml of water? 2 The molar mass of AlF 3 is: molar mass = (26.98 (Al)

### 1.24 Calculations and Chemical Reactions

1.24 Calculations and Chemical Reactions Converting quantities between different substances using a balanced equation A balanced chemical equation tells us the number of particles of a substance which

### Formulae, Equations & Formula Mass

St Peter the Apostle High School Chemistry Department Formulae, Equations & Formula Mass N4 & N5 Homework Questions Answer questions as directed by your teacher. National 4 level questions are first followed

### 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

### Chapter 10 Stoichiometry

Chapter 10 Stoichiometry Exercise 1 Show your work. For questions 1-4 use the equation: 2Mg + O 2 2MgO 1. Calculate the number of moles of oxygen needed to reaction with 6 moles of Mg. 2. Calculate the

### Chapter 10 Stoichiometry

Chapter 10 Stoichiometry Exercise 1 Show your work. For questions 1-4 use the equation: 2Mg + O 2 2MgO 1. Calculate the number of moles of oxygen needed to reaction with 6 moles of Mg. 6 mol Mg /1 mol

### Solution. Practice Exercise. Concept Exercise

Example Exercise 8.1 Evidence for a Reaction Which of the following is experimental evidence for a chemical reaction? (a) Pouring vinegar on baking soda gives foamy bubbles. (b) Mixing two solutions produces

### SCIENCE NSPIRED. Open the TI-Nspire TM document Balancing_Chemical_Equations_Practice.tns.

Open the TI-Nspire TM document Balancing_Chemical_Equations_Practice.tns. In this activity you will use ChemBox feature of TI-Nspire TM technology to practice balancing chemical equations. Move to pages

### REACTION PREDICTION PRE-AP CHEMISTRY. Reaction Prediction Pre-AP Chem 05/27/15 K Jones Pg 1

REACTION PREDICTION PRE-AP CHEMISTRY Reaction Prediction Pre-AP Chem 05/27/15 K Jones Pg 1 Reactants Products The arrow means yields or produces (s) = solid (g)= gas (l)= liquid (aq)= aqueous (dissolved

### Ionic and Covalent Bonds

Chapter 6 Inorganic and Organic Compounds: Names and Formulas 6.1 Octet Rule and Ions Octet Rule An octet is 8 valence electrons is associated with the stability of the noble gases does not occur with

### 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

### CHEM 1301 THIRD TEST REVIEW

CHEM 1301 THIRD TEST REVIEW Chemical Equations Express reactions as equations. These: a) must contain the symbols/formulas for substances involved in the reaction (things on left are reactants; things

### 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 +

### 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,

### W1 WORKSHOP ON STOICHIOMETRY

INTRODUCTION W1 WORKSHOP ON STOICHIOMETRY These notes and exercises are designed to introduce you to the basic concepts required to understand a chemical formula or equation. Relative atomic masses of

### HOMEWORK 4A. Definitions. Oxidation-Reduction Reactions. Questions

HOMEWORK 4A Oxidation-Reduction Reactions 1. Indicate whether a reaction will occur or not in each of following. Wtiring a balcnced equation is not necessary. (a) Magnesium metal is added to hydrochloric

### Review. Reviewing Key Terms For each of the following terms, write a sentence that shows your understanding of its meaning. Knowledge/Understanding

Review Reflecting on Chapter 10 Summarize this chapter in the format of your choice. Here are a few ideas to use as guidelines: Give two different definitions for the term oxidation. Give two different

### REDOX REACTIONS AND REDOX EQUATIONS

5 REDOX REACTIONS AND REDOX EQUATIONS DEFINITIONS Most of the reactions and their equations considered so far have been based upon a rearrangement of ions between the components of a mixture. Another very

### Decomposition. Composition

Decomposition 1. Solid ammonium carbonate is heated. 2. Solid calcium carbonate is heated. 3. Solid calcium sulfite is heated in a vacuum. Composition 1. Barium oxide is added to distilled water. 2. Phosphorus

### Q1. The chart shows the processes involved in the manufacture of nitric acid from ammonia.

Chemistry C2 Foundation and Higher Questions Q1. The chart shows the processes involved in the manufacture of nitric acid from ammonia. (a) Complete the word equation for the reaction that takes place

### Naming Compounds Tutorial and Worksheet

Naming Compounds Tutorial and Worksheet Since we use different methods in naming binary covalent (molecular) compounds and ionic compounds, the first step in naming or writing the formula of a compound

### Chemical Reactions. Video 7 Combustion Reactions I can identify and predict the products of combustion

Chemical Reactions Chemical Reactions: Chemical reactions play a significant role in our lives. Considering the abundance of substances around and in us, it isn t surprising that we observe numerous examples

### B. chemical equation - set of symbols and numbers which represent a chemical change. Reactants Products

1 I. Introduction A. chemical reaction any chemical change B. chemical equation set of symbols and numbers which represent a chemical change 1. reactants what you begin with 2. products what you end up

### 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

### AP Review: Predicting Reactions (Question 4) Answers

AP Review: Predicting Reactions (Question 4) Answers For each of the following three reactions, in part (i) write a balanced equation for the reaction and in part (ii) answer the question about the reaction.

### Balancing Chemical Equations Practice

Science Objectives Students will describe what reactants and products in a chemical equation mean. Students will explain the difference between coefficients and subscripts in chemical equations. Students