AP BIOLOGY

Detailed explanation-1: -The substance(s) to the left of the arrow in a chemical equation are called reactants.

Detailed explanation-2: -On the left side, the reactant side, there are 2 hydrogen atoms and 2 oxygen atoms. On the right side, the product side, there are 2 hydrogen atoms and only 1 oxygen atom.

Detailed explanation-3: -In a chemical equation, the products are written on the left-hand side and the reactants on the right-hand side with an arrow in between.

Detailed explanation-4: -Synthesis reactions occur when two or more reactants combine in order to form a singular product. In this case, the 4 hydrogen atoms in the 2 hydrogen gas molecules (H2 ) combine with the 2 oxygen atoms in the 1 molecule of oxygen gas (O2 ). In doing this, only one product, water or H2O H 2 O, is formed.