Electrochemistry Quiz

What does electrochemistry primarily study?

• Conversion of electrical energy to chemical energy

• Production of electricity from spontaneous reactions

• Chemical reactions in gases

• Thermodynamics of chemical reactions

What is a spontaneous chemical reaction?

• Happens on its own and releases free energy

• Requires external energy to occur

• Always produces heat

• Involves only solid reactants

What is the purpose of a salt bridge in a Daniel cell?

• To prevent oxidation

• To maintain electrical neutrality

• To connect the two electrodes

• To increase the voltage

What is the oxidation reaction at the anode in a Daniel cell?

• Cu → Cu2+ + 2e-

• Zn2+ + 2e- → Zn

• Zn → Zn2+ + 2e-

• Cu2+ + 2e- → Cu

What does the Nernst equation relate to?

• Rate of reaction

• Mass and volume of reactants

• Cell potential under non-standard conditions

• Temperature and pressure

What is the unit of electrical resistance?

• Siemens

• Ohm

• Volt

• Ampere

What is a strong electrolyte?

• Partially ionizes in solution

• Does not conduct electricity

• Completely ionizes in solution

• Forms weak acids

What does Kohlrausch's law state?

• Limiting molar conductivity is the sum of individual contributions of ions

• All electrolytes behave the same in solution

• Conductivity is independent of concentration

• Electrolytes do not dissociate in solution

What is the Faraday's first law of electrolysis?

• The reaction occurs only at the cathode

• The amount of reaction is independent of current

• The amount of reaction is proportional to the quantity of electricity

• The reaction is always spontaneous

What happens during the electrolysis of copper sulfate?

• Only water is produced

• Copper is deposited at the cathode

• No reaction occurs

• Copper is deposited at the anode