Question

In a chemical reaction such as photosynthesis,

____ are the substances present before the reaction.

Answer 1

Reactants is ur answer.

Step-by-step explanation:

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

Answer 2

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.