Name Class Date. Chapter: Chemical Equations and Reactions

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1 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 mix solution A with solution B in a beaker. Which of the following observations does not help you prove that a chemical reaction has occurred? a. The beaker becomes warm. b. You see gas bubble out of solution. c. Solution A, solution B, and the mixture are all yellow. d. None of the above; all help prove that a chemical reaction has occurred. 2. In the reaction described by the word equation sodium water sodium hydroxide hydrogen gas a. sodium hydroxide is a product. b. sodium is a product. c. water is a reactant. d. Both (a) and (c) 3. Which of the following indicates that a chemical equation is balanced? a. The numbers of atoms of each element are the same on both sides of the equation. b. All of the coefficients are the same. c. The numbers of molecules on each side of the equation are equal. d. The sums of the coefficients on each side of the equation are equal. 4. From a complete and correctly written chemical equation, you can obtain the a. chemical formulas of the reactants and products. b. relative amounts of the reactants and products. c. physical states of the reactants and products. d. All of the above 5. To balance a chemical equation, you must a. adjust the subscripts. b. adjust the number of products. c. adjust the number of reactants. d. adjust the coefficients. Modern Chemistry 65 Chapter Test

2 Chapter Test A, continued 6. The formation of a solid product in a chemical reaction is represented by the symbol a. (aq). b. (g). c. (l). d. (s). 7. What symbol indicates a reversible reaction? a. b. c. d. 8. In the expression 3CO 2, the numbers 3 and 2 are, respectively, a. a subscript and a coefficient. b. a coefficient and a subscript. c. two subscripts. d. two coefficients. 9. What is the total number of molecules that is represented by the following chemical equation? NH 4 NO 2 N 2 2H 2 O a. 3 b. 4 c. 8 d Which equation below violates the law of conservation of mass? a. 2H 2 O 2 2H 2 O b. KCl Br 2 KBr Cl 2 c. 2Fe 2 O 3 3C 4Fe 3CO 2 d. Na 2 CO 3 2HCl 2NaCl H 2 O CO Which of the following equations represents the balanced equation for the reaction of iron and oxygen? a. 2Fe O 2 Fe 2 O 3 b. Fe 3O 2 Fe 2 O 3 c. 4Fe 3O 2 2Fe 2 O 3 d. 3Fe 3O 2 2Fe 2 O Which coefficients correctly balance the formula equation below? KClO 3 (s) KCl(s) O 2 (g) a. 1, 1, 1 b. 1, 1, 3 c. 2, 2, 3 d. 2, 1, Which equation is not balanced? a. 2H 2 O 2 2H 2 O b. 4H 2 2O 2 4H 2 O c. H 2 H 2 O 2 H 2 O H 2 O d. 2H 2 O 2 H 2 O 14. In which type of reaction do two or more compounds react to form one product? b. decomposition c. combustion d. single-displacement Modern Chemistry 66 Chapter Test

3 Chapter Test A, continued 15. Which of the following is true regarding single-displacement reactions? a. Only one product is formed. b. There is only one reagent. c. It requires oxygen. d. One element replaces another in a compound. 16. Which of the following is true regarding double-displacement reactions? a. Two products are formed. b. The ions of the two reactants must be exchanged. c. A precipitate may form. d. All of the above 17. A mixture of propane and oxygen react to form carbon dioxide and water. What type of chemical reaction is this? b. decomposition c. double-displacement d. combustion 18. What type of chemical reaction does the following chemical equation represent? 2HCl(aq) Cr(s) H 2 (g) CrCl 2 (aq) a. composition b. single-displacement c. decomposition d. double-displacement 19. Calcium carbonate, CaCO 3, reacts to form calcium oxide, CaO, and carbon dioxide, CO 2. What type of reaction is this? b. replacement c. combustion d. decomposition 20. What type of chemical reaction is represented by the following word equation? iron oxygen iron(ii) oxide b. replacement c. combustion d. double-displacement Modern Chemistry 67 Chapter Test

4 Chapter Test A, continued 21. Metal X replaces the ions of metal Y from solution, but it cannot replace the ions of metal Z from solution. The order these metals should have in the activity series (from top to bottom) is a. x, y, z b. z, x, y c. y, x, z d. z, y, x 22. In a single-displacement reaction, an element in the activity series most likely can replace any element a. above it on the list. b. in the same group. c. below it on the list. d. in any other group. 23. The activity series helps to predict a. the amount of product formed by a chemical reaction. b. whether or not a specific chemical reaction is possible. c. the coefficients needed to balance a chemical equation. d. the amount of energy needed to start a chemical reaction. 24. If calcium is listed above magnesium in the activity series, and magnesium is listed above zinc, which of the following reactions is possible? a. Ca(s) MgCl 2 (aq) b. Zn(s) MgCl 2 (aq) c. Zn(s) CaCl 2 (aq) d. Mg(s) CaCl 2 (aq) 25. You have an unknown metal, X. You conduct two experiments. The results are shown in the table below. Procedure X(s) NaCl(aq) X(s) ZnCl 2 (aq) Result no reaction reaction of metal Which of the following statements is a logical conclusion based on the experimental data? a. The unknown metal is higher on the activity series than both sodium and zinc. b. The unknown metal is higher on the activity series than sodium, but below zinc. c. The unknown metal is higher on the activity series than zinc, but below sodium. d. The unknown metal is below both sodium and zinc on the activity series. Modern Chemistry 68 Chapter Test

5 TEACHER RESOURCE PAGE SiO CI Sn(CrO 4 ) Ba(OH) phosphorus(iii) iodide 18. dinitrogen tetroxide 19. iron(ii) nitrite 20. carbon tetrachloride 21. carbon monoxide 22. copper(ii) carbonate 23. CaCl 2, calcium chloride 24. PbCrO 4, lead(ii) chromate 25. Al 2 (SO 4 ) 3, aluminum sulfate 26. Sn 3 (PO 4 ) 4, tin(iv) phosphate 27. cyanide ion 28. oxide ion 29. hydroxide ion 30. S Cu 32. CO H, 1; O, C, 4; O, N, 3; H, g/mol amu % Cu, 52.73% Cl g 40. CF C 4 H C 2 H 6 8 Chemical Equations and Reactions, pp TEST A 1. c 2. d 3. a 4. d 5. d 6. d 7. a 8. b 9. b 10. b 11. c 12. c 13. d 14. a 15. d 16. d 17. d 18. b 19. d 20. a 21. b 22. c 23. b 24. a 25. c TEST B 1. b 2. a 3. b 4. d 5. a 6. b 7. d 8. a 9. coefficient 10. liquid 11. reversible reaction 12. A X AX 13. AX A X 14. A BX AX B 15. AX BY AY BX 16. metal hydroxides 17. combustion reaction 18. electrolysis 19. activity series 20. chemical equation 21. conservation of mass 22. gaseous 23. heated 24. A word equation and a formula equation are both qualitative. Although they both show the reactants and products of a chemical reaction, they give no information about amounts of reactants or products. A chemical equation, however, does show the relative amounts of the reactants and products in a chemical reaction. 25. Three indications of a chemical reaction are the radiation of heat and light, the production of a gas, and the formation of a precipitate. 26. zinc sulfide oxygen zinc oxide sulfur dioxide 27. sodium iodide chlorine sodium chloride iodine 28. Mg O 2 MgO 29. CaCO 3 CaO CO decomposition reaction 31. single-displacement reaction 32. synthesis reaction 33. double-displacement reaction 34. 2AgNO 3 CuCl 2 2AgCl Cu(NO 3 ) PbO 2 2PbO O Zn(OH) 2 2CH 3 COOH Zn(CH 3 COO) 2 2H 2 O 37. Mg(s) 2H 2 O(g) Mg(OH) 2 (aq) H 2 (g) 38. no reaction 39. Cl 2 (g) MgBr 2 (aq) MgCl 2 (aq) Br 2 (l) Modern Chemistry 226 Answer Key

6 TEACHER RESOURCE PAGE 40. Zn(s) 2HCl(aq) ZnCl 2 (aq) H 2 (g) 41. no reaction 42. Ni(s) CuCl 2 (aq) NiCl 2 (aq) Cu(s) 43. no reaction 44. Mg(s) Co(NO 3 ) 2 (aq) Mg(NO 3 ) 2 (aq) Co(s) 9 Stoichiometry, pp TEST A 1. a 2. b 3. a 4. a 5. d 6. c 7. a 8. d 9. b 10. d 11. a 12. c 13. b 14. a 15. b 16. d 17. a 18. c 19. c 20. b 21. d 22. a 23. d 24. a 25. c TEST B 1. c 2. b 3. d 4. a 5. a 6. a 7. a 8. b 9. given: mass of NH g unknown: mass of N given: mass of H 2 O 500 g unknown: moles of H given: amount of CO 2 20 mol unknown: mass of CO 12. given: amount of H 2 O 50 mol unknown: moles of O given: mass of SO g unknown: mass of S actual yield 14. percentage yield the oretical yield moles of A moles of B 1 mol C 16. 7H6O g C7H6O3 17. limiting reactant or reagent 18. actual yield 19. excess reactant g g FeO mol O mol PbI g KClO g CO g H % mol KCl g KCl % 10 States of Matter, pp TEST A 1. b 2. a 3. c 4. b 5. d 6. b 7. c 8. d 9. a 10. c 11. b 12. a 13. c 14. a 15. b 16. d 17. a 18. c 19. c 20. b 21. b 22. b 23. a 24. a 25. d TEST B 1. a 2. c 3. a 4. c 5. c 6. c 7. a 8. pressure 9. temperature mm 11. V P VP 12. kinetic-molecular theory 13. effusion 14. ideal gas 15. diffusion 16. pressure 17. newton 18. barometer 19. partial pressure 20. decrease 21. absolute zero 22. elastic 23. fluids 24. c 25. d Modern Chemistry 227 Answer Key

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