Energy and Reaction Rates

This set of flashcards covers key vocabulary terms and concepts related to chemical reaction rates and energy.

Collision Theory

reactions happen when particles collide with enough energy and the right orientation.

Activation Energy

the minimum amount of energy needed for a reaction to start

Activated Complex

a temporary, unstable arrangement of atoms formed during a collision before products form.

Catalyst

a substance that speeds up a reaction without being used up

Exothermic Reaction

a reaction that releases energy, usually as heat

Endothermic Reaction

a reaction that absorbs energy, usually as heat

Factors Affecting Reaction Rates

1. Temperature 2. Stirring 3. Presence of a catalyst 4. Pressure (gases only).

Heat of Reaction (ΔH)

The difference in energy between the products and reactants; can be positive (endothermic) or negative (exothermic).