Chapter 14 Study Questions Name: Sci Class: Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. 1. Balancing a chemical equation so that the same number of atoms of each element is found in both the reactants and the products is an illustration of a. activation energy. c. the law of conservation of mass. b. the law of conservation of energy. d. a double-replacement reaction. 2. Which of the following is the correct chemical formula for calcium chloride? a. CaCl c. Ca 2 Cl b. CaCl 2 d. Ca 2 Cl 2 3. In which type of reaction do ions in two compounds switch places? a. synthesis c. single-replacement b. decomposition d. double-replacement 4. Which of the following is an example of the use of activation energy? a. plugging in an iron c. holding a lit match to paper b. playing basketball d. eating 5. Enzymes in your body act as catalysts. Thus, the role of enzymes is to a. increase the rate of chemical reactions. c. help you breathe. b. decrease the rate of chemical reactions. d. inhibit chemical reactions. 6. Which of the following is an example of a diatomic element? a. NaCl c. Mg b. O 2 d. CaCl 2 7. Which of the following is an example of a single-replacement reaction? a. Fe + 2HCl FeCl 2 + H 2 c. 2H 2 O 2 2H 2 O + O 2 b. 2Mg + O 2 2MgO d. NaOH + HCl NaCl + H 2 O 8. Which of the following is NOT an example of a chemical reaction? a. milk turning sour c. a match burning b. food being digested d. ice melting 9. How many atoms are represented in the formula CaCO 3? a. three c. five b. four d. six 10. Which of the following usually increases the rate of a reaction? a. decreasing the concentration of the reactants b. grinding a solid reactant into a powder c. lowering the temperature. d. adding an inhibitor. 11. A catalyst a. slows the rate of a reaction. b. increases the energy given off by a reaction. c. lowers the activation energy of a reaction. d. is permanently changed when used in a reaction. 12. Which of the following is NOT a clue that a chemical reaction is taking place? a. a substance bends c. a precipitate forms b. change in color d. bubbles form 13. When the substances that make up baking powder are mixed with water, carbon dioxide gas is formed. This is an example of a. a physical reaction. c. a change of state. b. a chemical reaction. d. a nuclear reaction.
14. The new substances produced in a chemical reaction have a. the same properties as the original substances. b. different physical properties from the original substances. c. different chemical properties from the original substances. d. different physical and chemical properties from the original substances. 15. Which of the following is an example of a chemical reaction? a. Coal burns. c. Bones bleach. b. A pencil breaks. d. Ice melts. 16. For a chemical reaction to occur, a. chemical bonds must break. c. new bonds must form. b. atoms must rearrange. d. All of the above 17. A shorthand method of identifying an element is a chemical a. symbol. c. reaction. b. change. d. formula. 18. A shorthand notation for a compound or a diatomic element using chemical symbols and numbers is a chemical a. symbol. c. reaction. b. formula. d. change. 19. A indicates the chemical makeup of a substance by showing how many of each kind of atom is present in a molecule. a. chemical symbol c. chemical reaction b. chemical formula d. chemical change 20. Which of the following is the chemical formula for the diatomic element oxygen? a. O c. O 2 b. O 1 d. 2O 21. Which of the following is the chemical formula for carbon dioxide? a. Co c. Co 2 b. CO 2 d. C2O 22. Which of the following is the chemical formula for dinitrogen monoxide? a. ON c. 2NO b. NO 2 d. N 2 O 23. Which is the proper order for the first five prefixes used in chemical names? a. mono-, tri-, di-, tetra-, penta- c. mono-, di-, tri-, tetra-, pentab. uno-, di-, tri, quatro-, penta- d. uno-, di-, tri-, tetra-, penta- 24. The names of compounds use prefixes. a. covalent c. metallic b. ionic d. atomic 25. The suffix -ide can be used in the names of which type of compound? a. covalent c. metallic b. ionic d. both (a) and (b) 26. If the name of a compound contains the name of a metal and a nonmetal, the compound is probably a. covalent. c. metallic. b. ionic. d. nonmetallic. 27. A shorthand description of a chemical reaction using chemical formulas and symbols is a chemical a. formula. c. change. b. symbol. d. equation. 28. In a chemical equation, a. reactants appear before the arrow. b. products appear after the arrow. c. a plus sign separates the formulas of two or more reactants or products. d. All of the above
29. The starting materials in a chemical reaction are a. reactants. c. yields. b. products. d. symbols. 30. The substances formed from a chemical reaction are a. symbols. c. yields. b. products. d. reactants. 31. One advantage of using chemical equations is that they are understood a. worldwide and require no translation. b. in most parts of the world and require very little translation. c. only by chemists. d. None of the above 32. What separates the formulas of the reactants from the formulas of the products? a. a plus sign c. a yields sign b. an arrow d. both (b) and (c) Determine the balanced equation for each of the following: 33. H 2 + O 2 H 2 O a. H 2 + O 2 H 2 O 2 c. 2H 2 + O 2 2H 2 O b. H 2 + O 2 2H 2 O d. H 2 + 2O 2 2H 2 O 34. F 2 + KCl KF + Cl 2 a. F 2 + KCl KF + Cl 2 c. F 2 + 2KCl KF + Cl 2 b. F 2 + KCl 2 KF 2 + Cl 2 d. F 2 + 2KCl 2KF + Cl 2 35. Al + HCl AlCl 3 + H 2 a. Al + HCl AlCl 3 + H 2 c. Al + 3HCl AlCl 3 + 3H 2 b. 2Al + 6HCl 2AlCl 3 + 3H 2 d. Al + 3HCl AlCl 3 + H 2 36. C 2 H 6 O + O 2 CO 2 + H 2 O a. C 2 H 6 O + O 2 CO 2 + H 2 O c. C 2 H 6 O + 3O 2 2CO 2 + 3H 2 O b. C 2 H 6 O + 3O 2 2CO 2 + H 2 O d. 2C 2 H 6 O + 3O 2 2CO 2 + 3H 2 O 37. The law of conservation of mass means that a chemical equation must show the same a. kind of atom on both sides of the arrow. b. number of atoms on both sides of the arrow. c. number and kind of atom on both sides of the arrow. d. None of the above 38. A reaction in which two or more substances combine to form a single compound is a a. synthesis reaction. c. single-replacement reaction. b. decomposition reaction. d. double-replacement reaction. 39. A reaction in which a single compound breaks down to form two or more simpler substances is a a. synthesis reaction. c. double-replacement reaction. b. decomposition reaction. d. single-replacement reaction. 40. A reaction in which an element takes the place of another element that is part of a compound is a a. synthesis reaction. c. single-replacement reaction. b. decomposition reaction. d. double-replacement reaction. 41. How many atoms of oxygen are there in Al 2 (SO 4 ) 3? a. 12 c. 4 b. 7 d. 15 42. The equation below is an example of which type of chemical reaction? 2Na + Cl 2 2NaCl
43. The equation below is an example of which type of chemical reaction? H 2 CO 3 H 2 O + CO 2 44. The equation below is an example of which type of chemical reaction? Zn + 2HCl ZnCl 2 + H 2 45. The equation below is an example of which type of chemical reaction? NaCl + AgF NaF + AgCl 46. A chemical reaction in which energy is released or removed is a. exothermic. c. a synthesis reaction. b. endothermic. d. a decomposition reaction. 47. A chemical reaction in which energy is absorbed is a. exothermic. c. a single-replacement reaction. b. endothermic. d. a double-replacement reaction. 48. Which of the following is an example of an exothermic reaction? a. Light energy is released in light sticks. b. Electrical energy is released in the dry cells of a flashlight. c. Light and thermal energy are released in a campfire. d. all of the above 49. Which reaction requires a continuous supply of energy? a. an exothermic reaction c. a synthesis reaction b. an endothermic reaction d. a decomposition reaction 50. Which reaction can continue to occur once it has begun? a. an exothermic reaction c. a synthesis reaction b. an endothermic reaction d. a decomposition reaction 51. Three light sticks are placed in water baths of varying temperatures. At which temperature would the light stick glow the brightest? a. 0 C c. 30 C b. 20 C d. 40 C 52. Increasing the concentration the number of reactant particles present and the distance between them. a. increases; increases c. decreases; increases b. increases; decreases d. decreases; decreases 53. When reactant particles collide more often, a. the reaction rate remains the same. c. the reaction rate increases. b. the reaction rate decreases. d. None of the above 54. Which of the following samples of baking soda would react the fastest with vinegar? a. powder c. small crystal b. small cube d. They all react at the same rate. Examine the graphs below and answer the questions that follow.
55. What is indicated by A in Graph 1? a. energy absorbed c. activation energy b. energy given off d. total energy 56. What is indicated by B in Graph 1? a. energy given off c. activation energy b. energy absorbed d. total energy 57. What type of reaction is shown in Graph 1? a. substitution reaction c. endothermic reaction b. synthesis reaction d. exothermic reaction 58. What is indicated by A in Graph 2? a. energy given off c. activation energy b. energy absorbed d. none of the above 59. What is indicated by B in Graph 2? a. energy given off c. activation energy b. energy absorbed d. none of the above 60. What type of reaction is shown in Graph 2? a. single-replacement reaction c. endothermic reaction b. double-replacement reaction d. exothermic reaction 61. Which graph illustrates the type of reaction that occurs when wood burns? a. Graph 1 b. Graph 2 62. Which of the following would react the fastest with water? a. an effervescent tablet b. an effervescent tablet cut in half c. an effervescent tablet cut into fourths d. an effervescent tablet crushed into a powder 63. A substance that speeds up a reaction without being permanently changed is called a(n) a. reactant. c. inhibitor. b. catalyst. d. concentrate. 64. A substance that slows down or stops a chemical reaction is called a(n) a. product. c. inhibitor. b. catalyst. d. concentrate. 65. Which of the following is an example of an inhibitor? a. a preservative added to food c. steam b. a car's catalytic converter d. light 66. The total mass of the reactants must equal a. the net charge. c. the total mass of the catalysts. b. the total mass of the products. d. the mass of the precipitate.
67. Which of the following is NOT an example of the law of conservation of mass? a. The mass is the same before and after a reaction takes place. b. A chemical equation is balanced. c. The same number and kind of atom are on both sides of the arrow in a chemical equation. d. The reactants are different from the products. 68. Which of the following is the chemical formula for sulfur dioxide? a. 2SO c. S 2 O b. SO 2 d. S2O 69. Which of the following would NOT provide activation energy for a reaction? a. the friction of striking a match c. a beam of light b. an electric spark in a car's engine d. a vacuum 70. The minimum amount of energy needed for substances to react is called a. activation energy. c. exothermic energy. b. catalytic energy. d. endothermic energy. 71. Why must hydrogen peroxide be stored in a dark bottle to maintain its freshness? a. to block thermal energy c. to decompose the contents b. to block light energy d. none of the above 72. Which of the following is an example of a catalyst? a. most poisons c. enzymes in your body b. a dark container d. preservatives in food 73. A reaction will occur only if the particles of a. products collide. c. both products and reactants collide. b. reactants collide. d. None of the above 74. Which of the following is the formula for carbon tetrachloride? a. CCl 3 c. CCl 7 b. CCl 4 d. CCl 10 75. Which of the following is the formula for sodium fluoride? a. SF c. NaF b. SFl d. NaFl 76. Which of the following is a correct way to refer to H 2 O? a. hydrogen oxide c. hydrogen dioxide b. dihydrogen monoxide d. hydrogen peroxide 77. How many nitrogen atoms are in the chemical formula Ca(NO 3 ) 2? a. 1 c. 3 b. 2 d. 6 78. Which of the following is the chemical formula for carbon monoxide? a. Co c. Co 1 b. CO d. CO 10 79. When calcium bromide reacts with chlorine, bromine and calcium chloride are produced. Which of the following equations describes this reaction? a. CaBr 2 + Cl 2 Br 2 + CaCl 2 c. CaBr 2 + Cl 2 Br 2 + 2CaCl 2 b. 2CaBr 2 + Cl 2 Br 2 + 2CaCl 2 d. 2CaBr + Cl 2 Br 2 + 2CaCl Short Answer 80. Does the energy diagram below show an exothermic or an endothermic reaction? How can you tell?
81. Classify each of the following reactions: a. Fe + O 2 Fe 2 O 3 b. Al + CuSO 4 Al 2 (SO 4 ) 3 + Cu c. Ba(CN) 2 + H 2 SO 4 BaSO 4 + HCN 82. Use the energy diagram below to answer the questions that follow. a. Which letter represents the energy of the products? b. Which letter represents the activation energy of the reaction? c. Is energy given off or absorbed by this reaction? The graphs below show an exothermic and an endothermic reaction. Examine the graphs and answer the questions that follow. 83. What does A represent in the reactions above? 84. Which graph represents an endothermic reaction? Explain your answer. 85. Which graph represents an exothermic reaction? Explain your answer.