How can a chemical reaction be slowed down?

There are a few ways to slow down a chemical reaction:

Provide less heat ; adding heat increases particle movement, speeding up a reaction.

Less surface area : a larger surface area often also speeds up the reaction.

Less quantity of the element

the mass of the cathode increases because ions from the solution get reduced to atoms and become part of the cathode.

explanation:

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d.) the average kinetic energy of the gas particles is greater in container b because its particles move faster.