Which statement best describes the use of a catalyst in a fuel cell? it reduces waste. it lowers energy requirements. it reduces toxic exhaust. it increases reaction rates.

Option (d) is the correct answer.

Explanation:

A catalyst is a substance that helps in increasing the rate of a chemical reaction without itself getting consumed in the reaction.

Basically, a catalyst decreases the activation energy gap so that molecules with less energy can also participate in the reaction. Hence, rate of reaction increases due to which products are obtained quickly.

Thus, we can conclude that the statement, it increases reaction rates increases reaction rates.

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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answer; i believe the correct answer is (solid gold);