Energy

Exothermic Reactions – when energy is lost to the surroundings during a reaction.

Energy Profile for an Exothermic Reaction – the graph shows the variation in energy during the course of a chemical reaction where heat is released.

Endothermic Reactions – when energy is absorbed by the products from the surroundings during a reaction.

Activation Energy (Ea) – the initial energy that is required for a reaction to begin

Calorimeter – determines the amount of heat generated in a chemical reaction by the rise in temperature of the reaction chamber and the water jacket around the reaction vessel.

Bond Energy – the amount of energy needed or released to break or form a bond. Bond breaking is endothermic. Bond forming is exothermic.

ΔH = Total bond energy of all bonds broken – Total bond energy of all bonds formed