EVERYDAY SCIENCE

Detailed explanation-1: -When molecular hydrogen (H2) and oxygen (O2) are combined and allowed to react together, energy is released and the molecules of hydrogen and oxygen can combine to form either water or hydrogen peroxide.

Detailed explanation-2: -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.

Detailed explanation-3: -In cellular respiration, glucose and oxygen are used to produce ATP, with carbon dioxide as a by-product. Therefore, oxygen is a reactant in cellular respiration.

Detailed explanation-4: -There are two oxygen atoms in the reactants and two atoms of oxygen in the product. The law of conservation of matter has been satisfied.