Assessment Chapter Test A

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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.

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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 3CO2, 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?

NH4NO2 N2 2H2O

a. 3

b. 4

c. 8

d. 16

______10. Which equation below violates the law of conservation of mass?

a. 2H2 O2 2H2O b. KCl Br2 KBr Cl2 c. 2Fe2O3 3C 4Fe 3CO2 d. Na2CO3 2HCl 2NaCl H2O CO2

______11. Which of the following equations represents the balanced equation for

the reaction of iron and oxygen?

a. 2Fe O2 Fe2O3 b. Fe 3O2 Fe2O3 c. 4Fe 3O2 2Fe2O3 d. 3Fe 3O2 2Fe2O3

______12. Which coefficients correctly balance the formula equation below?

KClO3(s) KCl(s) O2(g)

a. 1, 1, 1

b. 1, 1, 3

c. 2, 2, 3

d. 2, 1, 1

______13. Which equation is not balanced?

a. 2H2 O2 2H2O b. 4H2 2O2 4H2O c. H2 H2 O2 H2O H2O d. 2H2 O2 H2O

______14. In which type of reaction do two or more compounds react to form one product? a. synthesis b. decomposition c. combustion d. single-displacement

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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? a. synthesis b. decomposition c. double-displacement d. combustion

______18. What type of chemical reaction does the following chemical equation represent?

2HCl(aq) Cr(s) H2(g) CrCl2(aq)

a. composition b. single-displacement c. decomposition d. double-displacement

______19. Calcium carbonate, CaCO3, reacts to form calcium oxide, CaO, and carbon dioxide, CO2. What type of reaction is this? a. synthesis b. replacement c. combustion d. decomposition

______20. What type of chemical reaction is represented by the following word equation?

iron oxygen iron(II) oxide

a. synthesis b. replacement c. combustion d. double-displacement

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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) MgCl2(aq) b. Zn(s) MgCl2(aq) c. Zn(s) CaCl2(aq) d. Mg(s) CaCl2(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) ZnCl2(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.

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TPErAiCnHt ER RESOURCE PAGE

10. 1 11. 2 12. 4 13. SiO2 14. CI4 15. Sn(CrO4)2 16. Ba(OH)2 17. phosphorus(III) iodide

18. dinitrogen tetroxide

19. iron(II) nitrite

20. carbon tetrachloride

21. carbon monoxide

22. copper(II) carbonate

23. CaCl2, calcium chloride 24. PbCrO4, lead(II) chromate 25. Al2(SO4)3, aluminum sulfate 26. Sn3(PO4)4, tin(IV) phosphate 27. cyanide ion

28. oxide ion

29. hydroxide ion 30. S2 31. Cu 32. CO32 33. H, 1; O, 1 34. C, 4; O, 2 35. N, 3; H, 1 36. 323.5 g/mol

37. 134.45 amu

38. 47.27% Cu, 52.73% Cl

39. 43.2 g

40. CF4 41. C4H10 42. C2H6

8 Chemical Equations and Reactions,

pp. 65?73

TEST A 1. c 3. a 5. d 7. a 9. b 11. c 13. d 15. d 17. d 19. d 21. b 23. b 25. c

2. d 4. d 6. d 8. b 10. b 12. c 14. a 16. d 18. b 20. a 22. c 24. a

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 equa-

tion 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 rela-

tive amounts of the reactants and

products in a chemical reaction.

25. Three indications of a chemical reac-

tion are the radiation of heat and light,

the production of a gas, and the forma-

tion of a precipitate.

26. zinc sulfide oxygen

zinc oxide sulfur dioxide

27. sodium iodide chlorine

sodium chloride iodine

28. Mg O2 MgO 29. CaCO3 CaO CO2 30. decomposition reaction

31. single-displacement reaction

32. synthesis reaction

33. double-displacement reaction

34. 2AgNO3 CuCl2 2AgCl Cu(NO3)2

35. 2PbO2 2PbO O2 36. Zn(OH)2 2CH3COOH

Zn(CH3COO)2 2H2O 37. Mg(s) 2H2O(g) Mg(OH)2(aq)

H2(g) 38. no reaction

39. Cl2(g) MgBr2(aq) MgCl2(aq) Br2(l)

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