chemistry

Question 1  (0.9 points)

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Consider the following electrochemical cell:

Cu(s) | CuSO4(aq) || KCl(aq) | Cl2(g) | C(graphite).





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Question 2  (0.7 points)

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What is the E°cell for the cell that forms from the following half
reactions?

Fe3+(aq) + e- ---> Fe2+(aq)

Zn2+(aq) + 2e- ---> Zn(s)

e. 1.53 V  

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Question 3  (0.7 points)

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Which one of the following statements is true?

e. A fuel cell does not require a continuous supply of reactants.  

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Question 4  (0.9 points)

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Calculate the cell potential for the reaction

Zn(s) + 2 Cr+3(aq)[0.010 M] ---> 3 Zn+2(aq)[0.020 M] + 2 Cr(s)

given, Cr+3(aq) + 3e- ---> Cr(s) . . . . . . . Eo = -0.74 V

Zn+2(aq) + 2e- ---> Zn(s) . . . . . . .Eo = -0.76 V

e. -0.02 V  

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Question 5  (1 point)

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The following cell was observed to have an emf of 2.29 volts at 25.0oC
:

Zn(s) | Zn2+(aq,0.112 M) || Cl-(aq) | Cl2(g; 0.472 atm) | Pt(s) .

Use tables of standard reduction potentials in Silberberg to calculate
the concentration of chloride ion in the cathode compartment, [Cl-] / M
. Your answer should be dimensionless (no units) and be given to 2
significant figures.

Scientific notation should be entered as 6.2e-3 for 6.2 x 10-3.

Answer



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Question 6  (0.9 points)

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Which of the following statements are FALSE?

Go < 0 for

b. Go < 0 for

c. The cell potential for

Co|Co2+(0.1 M)||Fe3+(0.5 M)|Fe2+(1.5 M)|Pt

d. The cell potential for

Co|Co2+(0.25 M)||Fe3+(0.5 M)|Fe2+(1.0 M)|Pt

e. The cell potential for

Cu|Cu2+(2.0 M)||Cl2(2.0 atm)|Cl-(2.0 M)|Pt

is less than 1.02 V.  

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Question 8  (0.9 points)

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A certain metal crystallizes in a structure that has 4 atoms per unit
cell, and the unit cell is a cube. How is the lattice described for this
metal?

e. ) tetragonal  

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Question 9  (0.7 points)

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Which has the highest melting point?

e. ) they all exhibit the same melting point  

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Question 10  (0.8 points)

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Which of the species listed below can form hydrogen bonds with water
molecules?

e. CCl4 (carbon tetrachloride)  

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Question 11  (0.8 points)

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Which of the following has the smallest bond angles?

d. ) SO42-  

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Question 12  (0.8 points)

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Select the false statements from the following:

e. The nitrate ion, NO3-, is AB3E.  



Bonus questions:

Chlorine gas can oxidize zinc metal

Write half-reactions involved

Write the cell diagram for this process

Mark anode and cathode. Which reaction occurs at anode? Which at
cathode?

In an experiment, chlorine is formed in reaction of potassium
permanganate with concentrated hydrochloric acid. Write equation for the
reaction; balance it showing all steps of balancing.

In an experiment, chlorine is formed in reaction of potassium
permanganate with concentrated hydrochloric acid. Write equation for the
reaction; balance it showing all steps of balancing.Bottom of Form