10th Electrochemistry

What type of chemistry involves reactions that produce or consume free electrons?

• Thermochemistry

• Biochemistry

• Electrochemistry

• Organic chemistry

What is the definition of an oxidation-reduction (redox) reaction?

• A chemical reaction where one substance loses electrons while another substance gains them.

• A chemical reaction that only involves the transfer of protons.

• A chemical reaction that produces heat without any electron transfer.

• A chemical reaction where substances combine to form a new compound.

What term describes the electrical potential or the "push or pull" on electrons between two reactants in a redox reaction?

• Current

• Resistance

• Voltage

• Amperage

How do batteries prevent half-reactions from spontaneously going to equilibrium and releasing energy as heat?

• By increasing the temperature of the reactants.

• By isolating the half-reactions from each other.

• By adding a catalyst to speed up the heat release.

• By using only non-spontaneous reactions.

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What is voltage a way of expressing in the context of half-reactions?

• The chemical demand for electrons in one half-reaction.

• The tendency to lose electrons in one half-reaction.

• The electrical potential of each half-reaction.

• The overall energy released by a redox reaction.

What are the standard conditions for determining electrical potentials in a galvanic cell?

• 0 degrees Celsius and 0.5 molar solutions.

• 100 degrees Celsius and 2 molar solutions.

• 25 degrees Celsius and 1 molar solutions.

• Room temperature and saturated solutions.

If the standard reduction potential for copper is +0.34 V and the standard reduction potential for zinc is -0.76 V, what is the standard cell potential for a galvanic cell where zinc is oxidized and copper ions are reduced?

• -0.42 V

• +0.42 V

• +1.10 V

• -1.10 V

What is the primary difference between a galvanic cell and an electrolytic cell?

• Galvanic cells require an external power source, while electrolytic cells generate electricity.

• Galvanic cells perform non-spontaneous reactions, while electrolytic cells perform spontaneous reactions.

• Galvanic cells generate electricity from spontaneous redox reactions, while electrolytic cells use electricity to drive non-spontaneous redox reactions.

• Galvanic cells are used for electroplating, while electrolytic cells are used in batteries.