EVERYDAY SCIENCE

Detailed explanation-1: -Chemical reactions that absorb (or use) energy overall are called endothermic. In endothermic reactions, more energy is absorbed when the bonds in the reactants are broken than is released when new bonds are formed in the products.

Detailed explanation-2: -Endothermic reactions are chemical reactions in which the reactants absorb heat energy from the surroundings to form products.

Detailed explanation-3: -Exothermic and endothermic reactions can be thought of as having energy as either a product of the reaction or a reactant. Exothermic reactions give off energy, so energy is a product. Endothermic reactions require energy, so energy is a reactant.

Detailed explanation-4: -All chemical reactions, including exothermic reactions, need activation energy to get started. Activation energy is needed so reactants can move together, overcome forces of repulsion, and start breaking bonds.

Detailed explanation-5: -The given statement that is “all chemical reactions are endothermic” is false because some of the chemical reactions release heat. An endothermic reaction describes the absorption of heat, and an exothermic reaction describes the release of heat.