Question

In a chemical reaction such as photosynthesis,
____ are the substances present before the reaction.

Answer 1

The answer is "reactants", or at least that is the generally accepted answer. A chemical equation will have two parts:

Reactants <------> Products

The double headed arrow represents a forward and reverse reaction but basic equations only have an arrow pointing towards the "Products" side.

Answer 2

Answer:

Reactants is ur answer.

Explanation:

before the react is preaent, the reactants have to be present.