The Chemistry Workshop      Ungrouped Chemistry Homework for Friday, 5/8 to Friday, 5/22

Friday, 5/8 and over the weekend--Read 9-3 and answer these questions.

Study the explanation & sample calculation at the top of page 323 and this reaction: 

C₆H₁₂O₆  + 6 O₂  =>  6 CO₂  + 6 H₂O     DH = -2870 kj

48. (a) How many kilojoules  are released when 10 moles of carbon dioxide are made?

      (b) How many kilojoules  are released when 2 moles of carbon dioxide are made?

      (c) How many kilojoules  are released when 8 moles of water are made?

Study sample problem 9B before answering question 49.

49. (a) Calculate the energy liberated when 250 grams of glucose undergoes cellular respiration.

Complete these 9-3 review questions found on page 324:  #1, #2, #3, #4,  #5 abcd, #6abcd, #8 abcd, #9 abcd

Monday, 5/11--Read 9-4 and answer these questions.

50. (a) What is a combustion reaction?     

(b) Give an example of a combustion reaction--Write a balanced chemical equation.

51. (a) What is an oxidation reaction?     

(b) Give an example of an oxidation reaction--Write a balanced chemical equation.

52. What is the main difference between an oxidation reaction and a combustion reaction?

53. Are all combustion reactions also oxidation reactions? EXPLAIN.

54. Are all oxidation reactions also combustion reactions?  EXPLAIN.

55. What is a synthesis reaction?      (b) Give an example of a synthesis reaction--Write a balanced chemical equation.

56. Are polymerization reactions also synthesis reactions?  EXPLAIN.

57. (a) What is a decomposition reaction?     

(b) Give an example of a decomposition reaction--Write a balanced chemical equation.

Tuesday, 5/12--Read 9-4 and answer these questions.

***NOTE-Displacement Reactions are commonly called SINGLE Replacement Reactions***

58. (a) What is a displacement reaction?     

(b) Give an example of a displacement reaction--Write a balanced chemical equation.

59. Explain what is happening during a displacement reaction.

60. (a) What is an activity series?     (b) Why do you need one for single replacement reactions?

61. How do you use an activity series to help you with displacement reactions?

62. Look at the reaction at the bottom of page 327. 

Explain why potassium was able to replace hydrogen in this reaction.

63. In an activity series, where are the most active elements?

64. Based on the information on page 327, re-write these sentences, filling in the blanks as you go:

(a) A _____ active element will replace a ________ active element in solution.

(b) In general, an element can replace those _______ it from compounds

65. Use the information on page 328 to complete this sentence:  In general, an element can displace _____________.

66. Study Sample Problem 9c and Use the activity series on page 327 to predict if the reaction will occur or not:

(a) Will Ba(s) + Al(NO₃)₃(aq) react?                        (b) Will Mg(s) + HNO₃(aq) react?

(c) Will Zn(s) + Al(NO₃)₃(aq) react?                        (c) Will Ba(s) + KNO₃(aq) react?

Wednesday, 5/13--Read 9-4 and answer these questions.

***NOTE-Double Displacement Reactions are commonly called Double Replacement Reactions***

67. (a) What is a displacement reaction?     

(b) Give an example of a displacement reaction--Write a balanced chemical equation.

68. Look at the reaction between lead ions and iodide ions in the middle of page 329.

      a) In the upper equation, the potassium ions and nitrate ions are not written.  Explain why.

      b) What happens to ionic compounds when they dissolve in water?

      c) Explain why this type of reaction is called a double displacement reaction.

      d) Explain what "KNO₃(aq)" stands for.

69. (a) What is a "total ionic equation"?      (b) Give an example of a total ionic equation   

(c) Do total ionic equations need to be balanced?

70. (a) What are "spectator ions"?    

(b) How can you tell when looking at a total ionic equation which ions are spectator ions?

71. What are the spectator ions in this total ionic equation? 

Ag⁺(aq)  + NO₃^-(aq)  + Na⁺(aq)  +  Cl^-(aq) => AgCl(s) +  Na⁺(aq)  + NO₃^-(aq) 

72. (a) What is a "net ionic equation"?     (b) How do you get a net ionic equation?

73. Consider this chemical reaction:

            AgNO₃(aq) + Na₂SO₄(aq) => Ag₂SO₄(s) + NaNO₃(aq)

(a) Balance it.

(b) Write the total ionic equation.

(c) Write the net ionic equation.

Thursday, 5/14--Chapter 9-4 Review.  Answer these section review questions found on page 330:

#1, #3, #4, #5abc, #6abc, #7abcd, #8abcde, 9abcd.

Friday, 5/15--General Chapter 9 Review, part 1.

1.  Define or describe the "Key terms" on page 335.

2.  Complete the "Term Review" on page 336.  **In order to receive credit, you must re-write the statement given and fill in the blank with the correct answer.**

Monday, 5/18--General Chapter 9 Review, part 2.

Complete questions 1-10 in the "Concept & Skills Review" found on pages 336 & 337.           

Tuesday, 5/19--General Chapter 9 Review, part 3.

Complete questions 11-21 in the "Concept & Skills Review" found on page 337.

Wednesday, 5/20--General Chapter 9 Review, part 4.

Complete questions 22-32 in the "Concept & Skills Review" found on page 338.

Thursday, 5/21--General Chapter 9 Review, part 5.

Complete questions 33-43 in the "Concept & Skills Review" found on page 339.

Enjoy your 3-day Holiday Weekend -- You've earned it!  

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