Energetics - (CCEA)Reactions and temperature changes
When a chemical reaction occurs, energy is transferred to, or from, the surroundings. An exothermic reaction releases heat to the surroundings and an endothermic reaction absorbs heat from the surroundings.
Energy is conserved in chemical reactions. The total amount of energy in the universe never changes. When a chemical reaction occurs, energy is transferred to or from the reaction’s immediate surroundings.
in endothermic reactions, energy enters.
in exothermic reactions, energy exits.
Exothermic reactions
An exothermic reaction An exothermic reaction gives out energy, usually in the form of heat. reaction transfers energy to its surroundings. The temperature of its surroundings increases.
Exothermic reactions include:
combustionCombustion is the reaction in which a fuel reacts with oxygen producing oxides and releasing heat. reactions
most neutralisationThe reaction between an acid and a base to form a salt plus water. reactions
