The presence of an appropriate enzyme affects only the

Answer;

-The rate of the reaction;

The presence of an enzyme affects only the rate of the reaction.

Explanation;

-Enzymes are biological catalysts. Catalysts lower the activation energy for reactions. The lower the activation energy for a reaction, the faster the rate. Thus enzymes speed up reactions by lowering activation energy.

-Additionally, the rate of a chemical reaction increases as the substrate concentration increases. Enzymes can greatly speed up the rate of a reaction. However, enzymes become saturated when the substrate concentration is high.

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sodium i think the chemical element of atomic number 11, a soft silver-white reactive metal of the alkali metal group.