June 2016 Chemistry Regents #78-81

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Questions 1-5 Questions 6-10 Questions 11-15 Questions 16-20 Questions 21-25 Questions 26-30 Questions 31-35 Questions 36-40 Questions 41-45 Questions 46-50

Question 51 Questions 52-53 Questions 54-55 Questions 56-58 Questions 59-60 Questions 61-62 Questions 63-65 Questions 66-69  Questions 70-71  Questions 72-74  Questions 75-77  Questions 78-81  Questions 82-85

 

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Question 78-81

 

 

Base your answers to questions 78 through 81 on the information below and on your knowledge of chemistry.

A student develops the list shown below that includes laboratory equipment and materials for constructing a voltaic cell.

Laboratory Equipment and Materials  

• a strip of zinc  

• a strip of copper  

• a 250-mL beaker containing 150 ml. of 0.1 M zinc nitrate  

 • a 250-mL beaker containing 150 ml. of 0.1 M copper(ll) nitrate

• wires

• a voltmeter  

•a switch  

• a salt bridge

78 State the purpose of the salt bridge in the voltaic cell. [l]

Answer--> ion flow

79 Complete and balance the half-reaction equation in your answer booklet for the oxidation of the Zn(s) that occurs in the voltaic cell. [I]

Zn-->_____  + ______

Answer--> Zn-->Zn2+  +  2e-

80 Compare the activities of the two metals used by the student for constructing the voltaic cell. [l]

Answer--> zinc is more active than copper

81 Identify one item of laboratory equipment required to build an electrolytic cell that is not included in the list. [1]

Answer--> battery or power source

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on to Questions 82-85

 

Questions 1-5 Questions 6-10 Questions 11-15 Questions 16-20 Questions 21-25 Questions 26-30 Questions 31-35 Questions 36-40 Questions 41-45 Questions 46-50

Question 51 Questions 52-53 Questions 54-55 Questions 56-58 Questions 59-60 Questions 61-62 Questions 63-65 Questions 66-69  Questions 70-71  Questions 72-74  Questions 75-77  Questions 78-81  Questions 82-85
 

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