Unit 7: Electrochemistry
- What is the effect of increasing the temperature on the equilibrium constant for an endothermic reaction?
- A) The equilibrium constant decreases
- B) The equilibrium constant remains the same
- C) The equilibrium constant increases
- D) The equilibrium constant fluctuates
- Answer: C) The equilibrium constant increases
- In a galvanic cell, if the cell potential is positive, what can be said about the cell’s spontaneity?
- A) The cell reaction is non-spontaneous
- B) The cell reaction is at equilibrium
- C) The cell reaction is spontaneous
- D) The cell reaction is impossible
- Answer: C) The cell reaction is spontaneous
- What is the standard cell potential for a cell composed of a zinc electrode and a copper electrode in their standard states?
- A) 0.34 V
- B) 1.10 V
- C) 2.00 V
- D) -1.10 V
- Answer: B) 1.10 V
- The standard reduction potential of which element is defined as zero volts?
- A) Chlorine
- B) Hydrogen
- C) Sodium
- D) Silver
- Answer: B) Hydrogen
- What is the main difference between a galvanic cell and an electrolytic cell?
- A) The type of reaction occurring
- B) The direction of electron flow
- C) The presence of a salt bridge
- D) The type of electrolyte used
- Answer: A) The type of reaction occurring
- In an electrochemical cell, which electrode undergoes reduction?
- A) Anode
- B) Cathode
- C) Salt bridge
- D) Electrode compartment
- Answer: B) Cathode
- What happens to the cell potential of a galvanic cell as the concentration of reactants increases?
- A) It decreases
- B) It remains constant
- C) It increases
- D) It becomes zero
- Answer: C) It increases
- What is the effect of increasing the concentration of reactants on the cell potential, according to the Nernst equation?
- A) The cell potential decreases
- B) The cell potential remains constant
- C) The cell potential increases
- D) The cell potential fluctuates
- Answer: C) The cell potential increases
- Which electrode in a galvanic cell is considered the positive electrode?
- A) Anode
- B) Cathode
- C) Salt bridge
- D) Both electrodes
- Answer: B) Cathode
- What is the standard electrode potential for the reduction of oxygen gas in acidic solution?
- A) +1.23 V
- B) +0.76 V
- C) -0.34 V
- D) +0.80 V
- Answer: A) +1.23 V
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