1. { Unit 7 Exam Review Chemical Reactions

2. Which of the following is a real-world example of a chemical reaction?  Cutting your hair  Mowing your lawn  The metal on your car turning into rust  Ripping a piece of paper

3. Which of the following is a real-world example of a chemical reaction?  Cutting your hair  Mowing your lawn  The metal on your car turning into rust  Ripping a piece of paper

4. 2Al 2 O 3 + 3C → 3CO 2 + 4Al What are the products of the above reaction?

5. 2Al 2 O 3 + 3C → 3CO 2 + 4Al What are the products of the above reaction?

6. N 2 + 3H 2 2NH 3 + Heat In the synthesis of ammonia (NH 3 ), which direction would be favored if hydrogen is added to the system?

7. N 2 + 3H 2 2NH 3 + Heat In the synthesis of ammonia (NH 3 ), which direction would be favored if hydrogen is added to the system? Forward

8. How many oxygen atoms are in 2Al 2 O 3 ?

9. 6 – O Atoms

10. What is the energy of the reactants on the potential energy curve above for the forward reaction?

11. 50kJ

12. What type of reaction is the following chemical reaction? MgCl 2 + 2HBr → MgBr 2 + 2HCl

13. What type of reaction is the following chemical reaction? MgCl 2 + 2HBr → MgBr 2 + 2HCl Double Replacement

14. Which metals would be replaced in a solution made from one of their compounds if a piece of calcium metal were added?   Only potassium, sodium, and lithium   All of the metals in the activity series   All of the metals except potassium, sodium, and lithium   None of the metals

15. Which metals would be replaced in a solution made from one of their compounds if a piece of calcium metal were added?   Only potassium, sodium, and lithium   All of the metals in the activity series   All of the metals except potassium, sodium, and lithium   None of the metals

16. How many grams are in 4.5 moles of sodium fluoride, NaF?

17. 189.0g NaF

18. What is the activation energy, E a, of the potential energy curve above for the reverse reaction?

19. 150kJ

20. The elements Br, I, N, Cl, H, O, and F form what type of molecule?

21. Diatomic

22. What are the coefficients that will balance the skeleton equation below? AlCl 3 + NaOH → Al(OH) 3 + NaCl

23. What are the coefficients that will balance the skeleton equation below? AlCl 3 + NaOH → Al(OH) 3 + NaCl 1, 3, 1, 3

24. What type of reaction is the following chemical reaction? 2Li 2 O → 4Li + O 2

25. What type of reaction is the following chemical reaction? 2Li 2 O → 4Li + O 2 Decomposition

26. You have a mixture that contains solutions of both sodium and aluminum compounds. You wish to ‘recover’ the aluminum but not the sodium. What other metal should you add to this mixture?

27. Li, Ca, or Mg

28. Chemical equations must be balanced to satisfy _______________.   The law of definite proportions   The law of multiple proportions   The law of conservation of mass   The law of destroying mass.

29. Chemical equations must be balanced to satisfy _______________.   The law of definite proportions   The law of multiple proportions   The law of conservation of mass   The law of destroying mass.

30. What type of reaction is the following chemical reaction? Mg(s) + 2HCl(aq) → MgCl 2 (aq) + H 2 (g)

31. What type of reaction is the following chemical reaction? Mg(s) + 2HCl(aq) → MgCl 2 (aq) + H 2 (g) Single Replacement

32. What are the coefficients that will balance the skeleton equation below? N 2 + H 2 → NH 3

33. What are the coefficients that will balance the skeleton equation below? N 2 + H 2 → NH 3 1, 3, 2

34. If a chemical reaction takes 10 seconds to occur at 30°C, would you expect the reaction to be faster or slower when the temperature is increased 45°C.

35. Faster

36. What are the missing coefficients for the skeleton equation below? Cr + Fe(NO 3 ) 2 → Fe + Cr(NO 3 ) 3

37. What are the missing coefficients for the skeleton equation below? Cr + Fe(NO 3 ) 2 → Fe + Cr(NO 3 ) 3 2, 3, 3, 2

38. Which of the following is not an exothermic reaction?   A test tube that feels hot after two substances have been mixed.   4Fe(s) + 3O 2 (g) → 2Fe 2 O 3 (s) + energy   A test tube that feels cold after two substances have been mixed.   The burning of wood to produce a hot flame.

39. Which of the following is not an exothermic reaction?   A test tube that feels hot after two substances have been mixed.   4Fe(s) + 3O 2 (g) → 2Fe 2 O 3 (s) + energy   A test tube that feels cold after two substances have been mixed.   The burning of wood to produce a hot flame.

40. What is the molar mass of carbon dioxide, CO 2 ?

41. 44.0g/mol

42. Why does powdered limestone react faster than a single piece of limestone of equal mass when both are placed in acid?

43. More Surface Area

44. How does a catalyst affect the rate of a reaction?   It lowers the enthalpy   It raises the enthalpy   It raises the activation energy   It lowers the activation energy

45. How does a catalyst affect the rate of a reaction?   It lowers the enthalpy   It raises the enthalpy   It raises the activation energy   It lowers the activation energy

46. How many moles are in 98.3 grams of aluminum hydroxide, Al(OH) 3 ?

47. 1.26 mol

48. What type of reaction is the following chemical reaction? CH 4 + 2O 2 → CO 2 + 2H 2 O

49. What type of reaction is the following chemical reaction? CH 4 + 2O 2 → CO 2 + 2H 2 O Complete Combustion

50. Translate the word equation “magnesium reacts with chlorine to produce magnesium chloride”.

51. Mg + Cl 2  MgCl 2

52. What is the change in enthalpy, ∆H, on the potential energy curve above for the forward reaction?

53. 50kJ

54. What is the molar mass of Zn(C 2 H 3 O 2 ) 2 ?

55. 183 g/mol

56. 2Al 2 O 3 + 3C → 3CO 2 + 4Al What are the coefficients in the above reaction?

57. 2Al 2 O 3 + 3C → 3CO 2 + 4Al What are the coefficients in the above reaction?

58. What symbol takes the place of the word “yields” is in an equation?

59. 

60. What does the symbol: represent in a chemical equation?

61. What does the symbol: represent in a chemical equation? Catalyst was used

62. Numbers are placed in front of reactants or products to show the ratio in which they either combine or form. What are these numbers called?

63. Coefficients

64. What is the molar mass of Ca(OH) 2 ?

65. 74g/mol

66. When a chemical hot pack is activated, it becomes hot to the touch. What is happening in terms of energy?

67. Exothermic Reaction – release of energy

68. What is the energy of the products on the potential energy curve above for the reverse reaction?

69. 50kJ

70. What type of reaction is the following chemical reaction? 2Fe + 3Cl 2 → 2FeCl 3

71. What type of reaction is the following chemical reaction? 2Fe + 3Cl 2 → 2FeCl 3 Synthesis

72. This reaction shows that:   Copper is more reactive than silver   Silver is more reactive than copper   The nitrate ion would rather combine with copper than silver   The nitrate ion would rather combine with silver than copper

73. This reaction shows that:   Copper is more reactive than silver   Silver is more reactive than copper   The nitrate ion would rather combine with copper than silver   The nitrate ion would rather combine with silver than copper

74. After the above reaction takes place, the copper nitrate solution is poured off and placed in a beaker. Which of the following metals could NOT then be used to remove the copper from the nitrate solution?   Potassium   Sodium   Magnesium   Mercury

75. After the above reaction takes place, the copper nitrate solution is poured off and placed in a beaker. Which of the following metals could NOT then be used to remove the copper from the nitrate solution?   Potassium   Sodium   Magnesium   Mercury

76. In a chemical reaction, what is the relationship between the total mass of the reactants and the total mass of the products?

77. Must be equal (same mass)

78. Translate the following statement: Hydrogen reacts with oxygen to produce water.

79. Translate the following statement: Hydrogen reacts with oxygen to produce water. H 2 + O 2  H 2 O

80. How many atoms of each element are in 2Ca 3 (PO 4 ) 2 ?

81. Ca – 6 P – 4 O - 16

82. What products will form when Al is reacted with K(NO 3 )?

83. No Reaction

84. N 2 + 3H 2 2NH 3 + Heat In the synthesis of ammonia (NH 3 ), which direction would be favored if the temperature was raised?

85. N 2 + 3H 2 2NH 3 + Heat In the synthesis of ammonia (NH 3 ), which direction would be favored if the temperature was raised?Reverse

86. 2Al 2 O 3 + 3C → 3CO 2 + 4Al What are the reactants of the above reaction?

87. 2Al 2 O 3 + 3C → 3CO 2 + 4Al What are the reactants of the above reaction?

88. Is the forward reaction endothermic or exothermic?

90. Which of the following is not evidence that a chemical reaction has occurred?   A color change   A precipitate being formed   Water is formed   Transfer of energy

91. Which of the following is not evidence that a chemical reaction has occurred?   A color change   A precipitate being formed   Water is formed   Transfer of energy