Thursday
April 24, 2014

Homework Help: chemistry

Posted by university on Wednesday, April 24, 2013 at 2:41pm.

Part A
Identify the anode and cathode, and indicate the direction of Na+ ion and NO3 - ion flow from the salt bridge.

1) Al is the anode and Co is the cathode; Na+ ions flow into half-cell compartment (A) and NO3 - ions flow into half-cell compartment (B).

2) Co is the anode and Al is the cathode; Na+ ions flow into half-cell compartment (A) and NO3 - ions flow into half-cell compartment (B).

3) Co is the anode and Al is the cathode; NO3 - ions flow into half-cell compartment (A) and Na+ ions flow into half-cell compartment (B).

4) Al is the anode and Co is the cathode; NO3 - ions flow into half-cell compartment (A) and Na+ ions flow into half-cell compartment (B).

Part B
Identify the anode and cathode, and indicate the direction of ion flow to and from each electrode.

1) Al is the anode and Co is the cathode; Co2+ ions flow to the cathode and Al3+ ions flow from the anode.

2) Al is the anode and Co is the cathode; Al3+ ions flow to the anode and Co2+ ions flow from the cathode.

3) Co is the anode and Al is the cathode; Co2+ ions flow to the anode and Al3+ ions flow from the cathode.

4) Co is the anode and Al is the cathode; Al3+ ions flow to the cathode and Co2+ ions flow from the anode

Part C
What is the balanced equation for the cell reaction?

1) 2 Al(s) + 3 Co2+(aq) → 2 Al3+(aq) + 3 Co(s)

2) 2 Al3+(aq) + 3 Co2+(aq) → 2 Al(s) + 3 Co(s)

3) 2 Al(s) + 3 Co(s) → 2 Al3+(aq) + 3 Co2+(aq)

4) 2 Al3+(aq) + 3 Co(s) → 2 Al(s) + 3 Co2+(aq)

Part D
What is the shorthand notation for the cell?

1) Co(s) | Co2+(aq) || Al(s) | Al3+(aq)

2) Al(s) | Al3+(aq) || Co2+(aq) | Co(s)

3) Al(s) | Al3+(aq) || Co(s) | Co2+(aq)

4) Co(s) | Co2+(aq) || Al3+(aq)| Al(s)

Part E
What is the quantitative change in the cell voltage on increasing the ion concentration in the anode compartment by a factor of 10?

1) -0.03 V

2) +0.02 V

3) -0.02 V

4) +0.03 V

Part F
What is the quantitative change in the cell voltage on increasing the ion concentration in the cathode compartment by a factor of 10?

1) -0.02 V

2) +0.03 V

3) +0.02 V

4) -0.03 V

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