Electrochem RG quiz

Electrons always flow from

• cathode to anode

• anode to cathode

Oxidation occurs at the

• anode

• cathode

Electrons are gained at the

• anode

• cathode

Which substance is reduced in the following reaction? 
NaOH + Li --> LiOH + Na

• Li
• Na
• O
• H

Consider the following reaction:
Zn_(s) + Cu⁺²_(aq) → Zn⁺²_(aq) + Cu_(s)
Identify the reactant that loses electrons

• Zn
• Cu⁺²

What is a galvanic (voltaic) cell?

• It is a cell that destroys electrons on one side and creates electrons on the other side.

• It is a cell that contains only one metal bar and one aqueous ion solution.

• It is a type of battery that drives a redox reaction when electricity is applied.

• It is a type of battery that generates an electrical current from redox reactions.

What is a half-reaction?

• It is a reaction at equilibrium where half of the substances are reactants and half of the substances are products.

• It is the reaction that occurs when the switch of a galvanic cell is open.

• It shows EITHER the reduction component or the oxidation component of a redox reaction.

• It shows BOTH the reduction and oxidation components of a redox reaction.

If E° is positive, ∆G° must be (positive/negative) and K must be (greater/less) than 1.

NO CALCULATOR:)

• negative, less

• negative, greater

• positive, less

• positive, greater

What is the oxidation number of Fe in Fe₂O₃?

• +1
• +3
• +2
• +6

What is oxidation number of P in K₃PO₄?

• +1

• +5

• +4

• +3