Unit 10: Electrochemistry

11. What is the primary function of an electrochemical cell?

a) To measure temperature
b) To convert chemical energy into electrical energy
c) To perform spectroscopic analysis
d) To separate mixtures
Answer: b) To convert chemical energy into electrical energy

12. In an electrochemical cell, the anode is the electrode where:

a) Reduction occurs
b) Oxidation occurs
c) Electrical energy is converted into chemical energy
d) The cell potential is zero
Answer: b) Oxidation occurs

13. The electrode where reduction occurs is called:

a) The anode
b) The cathode
c) The electrolyte
d) The salt bridge
Answer: b) The cathode

14. In a galvanic cell, the salt bridge:

a) Facilitates the flow of electrons
b) Maintains electrical neutrality by allowing ions to flow
c) Provides a path for the electrons to move
d) Increases the reaction rate
Answer: b) Maintains electrical neutrality by allowing ions to flow

15. What does the standard electrode potential (E°) represent?

a) The potential difference between two electrodes in a galvanic cell
b) The amount of energy released in a reaction
c) The voltage when all reactants and products are in their standard states
d) The concentration of ions in the solution
Answer: c) The voltage when all reactants and products are in their standard states

16. The cell potential (E_cell) of a galvanic cell is calculated using:

a) E_cell = E_cathode – E_anode
b) E_cell = E_anode + E_cathode
c) E_cell = E_cathode – E_anode
d) E_cell = E_anode – E_cathode
Answer: b) E_cell = E_cathode – E_anode

17. The Nernst equation relates the cell potential to:

a) Temperature and pressure
b) Concentrations of reactants and products
c) The electrode material
d) The reaction rate
Answer: b) Concentrations of reactants and products

18. In a concentration cell, the driving force for the reaction is:

a) A difference in electrode material
b) A difference in temperature
c) A difference in concentration of ions
d) A difference in pressure
Answer: c) A difference in concentration of ions

19. The standard reduction potential for the hydrogen electrode is defined as:

a) 0 V
b) 1 V
c) 2 V
d) 0.5 V
Answer: a) 0 V

20. A voltaic cell and a galvanic cell are:

a) Different names for the same type of cell
b) Different types of electrochemical cells with no similarities
c) Cells that only work at high temperatures
d) Used to measure the rate of chemical reactions
Answer: a) Different names for the same type of cell