Question

1. the number placed in front of a chemical symbol or formula that shows how many atoms or molecules of the substance are involved in the reaction is called the: checkbox catalyst checkbox reactant checkbox coefficient checkbox equation

Explanation:

In chemistry, coefficients are the numbers placed in front of chemical symbols or formulas in a chemical equation to balance the number of atoms or molecules of substances involved in the reaction. A reactant is a starting - material in a chemical reaction, a catalyst speeds up a reaction without being consumed, and an equation represents the chemical reaction.

Answer:

coefficient