Chapter 8 Practice Test

Transcription

1 Name Class Date Assessment Chapter 8 Practice Test 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 69 Chapter Test

2 Name Class Date 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 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 70 Chapter Test

3 Name Class Date 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 71 Chapter Test

4 Name Class Date 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 72 Chapter Test

5 Name Class Date Write a formula equation for each word equation in the space provided. 26. magnesium + oxygen magnesium oxide 27. calcium carbonate calcium oxide + carbon dioxide On the line to the left, identify each chemical equation as a synthesis, decomposition, single-displacement, or double-displacement reaction H 2 O(l) 2H 2 (g) + O 2 (g) 29. Cl 2 (g) + 2KBr(aq) 2KBr(aq) + Br 2 (l) 30. CaO(s) + H 2 O(l) Ca(OH) 2 (s) 31. HCl(aq) + NaOH(aq) NaCl(aq) + H 2 O(l) Balance the following formula equations in the space provided. 32. AgNO 3 + CuCl 2 AgCl + Cu(NO 3 ) PbO 2 PbO + O Zn(OH) 2 + CH 3 COOH Zn(CH 3 COO) 2 + H 2 O Modern Chemistry 73 Chapter Test

6 Name Class Date Chapter Test B, continued PART V Using the activity series table, predict whether each of the following reactions will occur. Write no reaction for those that will not occur. For the reactions that will occur, write the products and balance the equations in the space provided. 35. Mg(s) + steam 36. Pt(s) + O 2 (g) 37. Cl 2 (g) + MgBr 2 (aq) 38. Zn(s) + HCl(aq) 39. Cr(s) + H 2 O(l) 40. Ni(s) + CuCl 2 (aq) 41. Ni(s) + H 2 O(l) 42.Mg(s) + Co(NO 3 ) 2 (aq) Modern Chemistry 74 Chapter Test

7 Name Class Date Metals Li React with cold F 2 Rb H 2O and acids, replacing Cl 2 K hydrogen. React Br 2 Ba with oxygen, l 2 Sr forming oxides. Ca Na Mg React with steam Al (but not cold water) Mn and acids, replacing Zn hydrogen. React Cr with oxygen, Fe forming oxides. Cd Co Do not react with water. Ni React with acids, replacing Sn hydrogen. React with Pb oxygen, forming oxides. H 2 React with oxygen, Sb forming oxides. Bi Cu Hg Ag Fairly unreactive, Pt forming oxides only Au indirectly. Activity Series of the Elements Halogens Modern Chemistry 65 Chapter Test