Chem 2 Lab Questions: 1. As the reaction in an electrochemical cell proceeds, th

Question

Chem 2 Lab Questions:

1. As the reaction in an electrochemical cell proceeds, the cell voltage _______.

a. becomes infinite b. increases c. remains constant d. decreases

2. The value calculated for Ecell   depends on (select 2 correct answers)

a. temperature b. he concentrations of non-spectator ions in the half-cells c. the concentrations of spectator ions in the half-cells d. the densities of the two metal electrodes

3. There are 2 half-cells in a galvanic cell. The half-cell with the ________ reduction potential will be the cathodic cell (where the cathode is located).

   a. more positive b. more negative c. zero d. none of the above

4. The unit which is associated with electrical potential is the

a. joule b. ampere,aka amp c. coulomb d. volt

5. The direction of electron transfer in an electrochemical cell is from the reduction half cell to the oxidation half cell.

   True/false

6. The half cell containing the anode is where _______ occurs in a galvanic cell.

   a. both oxidation and reduction b. neutralization c. reduction d. oxidation

7. The function of the salt bridge is to allow unrestricted ion flow between the half-cells of the galvanic cell

   True/false

8. There is no measurable voltage if the electrical circuit consists of only a single half-cell.

True/false

9. If an oxidation reduction reaction is attempted in a single beaker, instead of with the oxidation and reduction sites physically seperated (e.g., in seperate beakers),

a. oxidation and reduction can occur, but it will be impossible to measure the current or voltage of the electron transfer

b. oxidation can occur, but reduction can not

c. reduction can occur, but oxidation can not

d. neither oxidation nor reduction can occur

10. By convention, half-reactions are listed in tables as reductions, so the corresponding voltages are reduction potentials.

True/false

Explanation / Answer

1.d because concentration of ions decreases

2.a,b using Nernst equaion

3.a..reduction potential is the measure of the oxidising abiity

4.d..potential is measured in terms of volt

5.True. .. direction is opposite to the flow of electron s

6.d

7.true

8.true

9.a

10.true

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