A(n) _____ is substance that helps in the chemical digestion of food.

enzyme

A(n) enzyme is a substance that helps in the chemical digestion of food.

To find the answer to this question, we can break it down and look for clues. The question is asking for a substance that helps in the chemical digestion of food. Chemical digestion refers to the breakdown of food molecules into smaller, simpler compounds through chemical reactions.

One common substance that aids in chemical digestion is enzymes. Enzymes are biological catalysts that speed up chemical reactions in the body without being consumed. In the context of digestion, enzymes such as amylase, lipase, and protease help break down carbohydrates, fats, and proteins respectively.

So, the answer to the question is enzymes.