Question

value: 4
which of the following represents the number of the molecules, of the type indicated, is present as a reactant or product of the chemical reaction shown?

a. coefficient

b. subscript

c. symbol

d. product

Explanation:

To solve this, we analyze each option:

• Option a: A coefficient in a chemical equation is the number placed in front of a chemical formula, representing the number of molecules (or moles) of that substance involved in the reaction.
• Option b: A subscript indicates the number of atoms of an element in a molecule, not the number of molecules.
• Option c: A symbol (like H for hydrogen) represents an element, not a number of molecules.
• Option d: A product is a substance formed in a reaction, not a number representing molecules.

So the coefficient is the correct term for the number of molecules of a substance in a reaction.

Answer:

a. Coefficient