Which term describes substances that will be combined in a chemical equation?

Which term describes substances that will be combined in a chemical equation?

• A. Reactant
• B. Product
• C. Physical Change
• D. Metal

Answer: (A)

In a chemical equation, the substances that will be combined are called reactants. They are the starting materials that participate in the reaction and appear on the left side of the arrow. They transform to form new substances called products, which appear on the right side. For example, in H2 + O2 -> H2O, H2 and O2 are reactants, and H2O is the product. The other terms don’t describe the starting materials: a metal is a type of substance, and a physical change refers to a change in form or state without forming new substances.

In a chemical equation, the substances that will be combined are called reactants. They are the starting materials that participate in the reaction and appear on the left side of the arrow. They transform to form new substances called products, which appear on the right side. For example, in H2 + O2 -> H2O, H2 and O2 are reactants, and H2O is the product. The other terms don’t describe the starting materials: a metal is a type of substance, and a physical change refers to a change in form or state without forming new substances.