WRITE THE CORRECT SYMBOLS OR FORMULAS FOR THE WORD EQUA nons AND BALANCE THE EQUA nons.
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1 NAME _ EQUATION WRITING WRITE THE CORRECT SYMBOLS OR FORMULAS FOR THE WORD EQUA nons AND BALANCE THE EQUA nons. l. CALCIUM HYDROXIDE + SULFURIC ACID --> CALCIUM SULFATE + WATER...<:. 2. ANTIMONY + CHLORINE --> ANTIMONY.(ill) Clll..ORIDE 3. CALCIUM CARBONATE + PHOSPHORIC ACID --> CALCIUM PHOSPHATE + WATER + CARBON DIOXIDE 4. SODIUM PEROXIDE + WATER --> SODIUM HYDROXIDE + OXYGEN 5. ALUMINUM + HYDROCHLORIC ACID --> ALUMINUM Clll..ORIDE + HYDROOEN ) 6. SILVER + SULFUR --> SILVER SULFIDE 7. IRON (ill) OXIDE + HYDROOEN --> IRON + WATER 8. NITROGEN + HYDROOEN --> AMMONIA 9. ALUMINUM + COPPER(II)SULFATi: ~ > ALUMINUM SULFATE + COPPER LO. CALCIUM NITRATE + HYDROCHLORIC ACID--> CALCIUM Clll...oRIDE + NITRIC ACID
2 Name Equations w s~ 3 Date Write a balanced chemical equation to represent each of the following chemical reactions. 1. iron + sulfur -+ iron (II) sulfide 2. zinc + copper (II) sulfate -+ zinc sulfate + copper 3. silver nitrate + sodium bromide -+ sodium nitrate + silver bromide 4. potassium chlorate (heated) -+ potassium chloride + oxygen 5. water (electricity) -+ hydrogen + oxygen 6. mercury(ii) oxide (heated) -+ mercury + oxygen 7. potassium iodide + lead(ii) nitrate -+ lead(ii) iodide + potassium nitrate 8. aluminum + oxygen -+ aluminum oxide 9. magnesium chloride + ammonium nitrate -+ magnesium nitrate + ammonium chloride 10. iron(iii) chloride + ammonium hydroxide -+ iron(iii) hydroxide + ammonium chloride 11. sodium peroxide + water -+ sodium hydroxide + oxygen 12. iron (III) oxide + carbon -+ iron + carbon monoxide 13. iron + water -+ hydrogen + iron(iii) oxide 14. iron(iii) chloride + potassium hydroxide -+ potassium chloride + iron(iii) hydroxide 15. aluminum + sulfuric acid -+ aluminum sulfate + hydrogen 16. sodium carbonate + calcium hydroxide -+ sodium hydroxide + calcium carbonate 1984, 1993, Weston Walch, Publisher 37 (continued) (i) Chemistry Problems
3 Name _ Date Class _ Modem Chemistry CHAPTER 8 HOMEWORK 8-1 (pp ) Define. 1. reactants _ 2. products _ 3. cbemicffiequation _ 4. precipitate _ 5. word equation _ GRAPIDC ORGANIZER Complete the chart by listing three signs that suggest that a chemical reaction has taken place. Include an example of each indication. Use additional paper if necessary. Indication of Chemical Reaction Example On a separate sheet of paper, create a chart or checklist to help you remember the characteristics a chemical equation. Use a form that makes sense to you and include examples. 1. In a chemical equation, a coefficient indicates a. the exact amount of substance used as products in a chemical equation. b. the relative number of moles of substance in a reaction. c. the correct formulas of the reactants and products. d. that a precipitate bas formed. 2. Which coefficients would you add to balance the chemical equation Fe + O 2-7 F~03? a. 2,3,1 h. 3,2,1 c. 4,3,2 d. The equation is already balanced. Modem Chemistry Copyright by Holt, Rinehart and Winston, All rights reserved. of
4 Name _ Date Class _ Modern Chemistry CHAPTER 8 HOMEWORK 8-2 (pp ) Define. 1. cauuyst _ 2. reversible reaction _ Write the symbol that corresponds to each explanation. Explanation A reaction is carried out at 20 C. Indicator of result of a reaction Indicator of a gaseous reactant Indicator of a solid precipitate A reactant or product in the solid state Indicates a reversible reaction Indicates that reactants are heated Symbol SKILL BUILDER W' bal d h ical h f h h. I rite ance cnerru equations or eac o t ese c ennca reactions. Methane and oxygen react to form hydrogen carbon dioxide. Methane and chlorine react to form carbon tetrachloride and hydrochloric acid. and Hydrochloric acid and barium hydroxide react to form barium chloride and water. Silicon oxide and hydrofluoric acid react to form silicon tetrafluoride and water. 1. Which sentence is the correct translation for the equation 4Fe(s) + 30ig) -7 2Fe.t03(S)? a. Iron and dioxygen react to form bi-iron trioxide. b. Solid iron and gaseous oxygen react to form solid iron(iii) oxide. c. Solid iron and solid oxygen react to form iron trioxide. d. Iron and oxygen react to form gaseous iron(iii) oxide. 2. Chemical equations must be balanced in order to satisfy a. the law of inverse proportions. b. the Pauli exclusion principle. c. the law of conservation of energy. d. the law of conservation of mass. Modern Chemistry Copyright by Holt, Rinehart and Winston. All rights reserved.
5 Name _ Date Class _ Modern Chemistry CHAPTER 8 HOMEWORK 8-3 (pp ) Complete each sentence. 1. A chemical equation is like an algebraic equation because they both _ 2. The coefficients of a chemical reaction indicate _ 3. A chemical equation shows the smallest numbers of atoms, molecules, or ions that will satisfy 4. The relative masses of the reactants and products of a chemical reaction can be determined from 5. A chemical equation does not give information about _ SKILL BUILDER Calculate the relative masses of the reactants and products in each chemical reaction. Show your work. Use an additional sheet of paper if necessary. Zn + 2HCI ~ ZnCl 2 + H2 2KCI0 3 ~ 2KCI For a chemical equation to be balanced, a. only the number of atoms must be the same in the reactants and the products. b. the coefficients of the products must be greater than the coefficients of the reactants. c. the number and types of atoms must be the same in the products and reactants. d. the number of moles of reactant must be equal to the number of moles of product. 2. According to the reaction 2F~03 + 3C ~ 4Fe + 3C0 2, how many grams of carbon dioxide are produced according to calculations of relative masses? a g b g c g d g Modern Chemistry Copyright by Holt, Rinehart and Winston. All rights reserved.
6 Name Date Class _ Modem Chemistry CHAPTER 8 HOMEWORK 8-4 (pp ) Select the term in Column B that matches the expression in Column A. Column A Column B 1. balanced chemical equation a. 2H2 + O 2-7 2H2O 2. aqueous hydrochloric acid b. (I) 3. unbalanced formula equation c. hydrogen and oxygen yield water 4. liquid state d yield e. HCI (aq) 6. reversible reaction () f. 7. word equation g. H2+ O2-7 H2O GRAPIDC ORGANIZER On a separate sheet of paper, create a flow chart that shows the steps in balancing equation. Include at least five steps. a chemical lllustrate how to perform the steps by writing a balanced chemical equation that shows the following: Potassium chloride and lead nitrate react to form potassium nitrate and lead chloride. 1. Which shows a correctly balanced chemical equation? a. Ca-r 0-7 2CaO b. MgO + HCI -7 MgCI + OHc. H2S04+ NaOH -7 Na2S04 + H20 d. NH 4 N02-7 N2H3 + H20 2. Which shows a correctly balanced chemical equation? a. 2Mg + O2-7 2MgO b. C3Hs + O2-7 CO2 + H20 c. Ca3P04 + H2S04-7 CaS04 + H 3 P04 d. K + H2 + OW -7 KOH + H2 Modem Chemistry Copyright by Holt, Rinehart and Winston. All rights reserved.
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Chem. I Notes Ch. 12, part 2 Using Moles NOTE: Vocabulary terms are in boldface and underlined. Supporting details are in italics. 1 MOLE = 6.02 x 10 23 representative particles (representative particles
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,
Chemistry Diagnostic Questions
Chemistry Diagnostic Questions Answer these 40 multiple choice questions and then check your answers, located at the end of this document. If you correctly answered less than 25 questions, you need to
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Skills Worksheet Problem Solving Mole Concept Suppose you want to carry out a reaction that requires combining one atom of iron with one atom of sulfur. How much iron should you use? How much sulfur? When