Question

What statement best represents what a chemical reaction is?

Option 1: A chemical reaction occurs when elements are physically combined to produce new mixtures.
Option 2: A chemical reaction occurs when 4 or more elements combine chemically.
Option 3: A chemical reaction occurs when atoms are rearranged to produce new substances.
Option 4: A chemical reaction occurs when atoms are combined in a solution.

Answer 1

A chemical reaction occurs when atoms are rearranged to produce new substances. It can be represented by a chemical equation with reactants on the left side and products on the right side. The law of conservation of mass states that mass is always conserved in a chemical reaction.

Step-by-step explanation:

A chemical reaction occurs when atoms are rearranged to produce new substances. In a chemical change, the chemical bonds of the substances break, and the atoms that compose them separate and rearrange themselves into new substances with new chemical bonds. This process can be represented by a chemical equation, with reactants on the left side and products on the right side. The law of conservation of mass states that mass is always conserved in a chemical reaction, so a balanced chemical equation must have the same number and type of each atom on both sides of the equation.