Rates of Reaction and Energy Changes

Rate of reaction

Describes how rapidly the reactants are consumed or the product is formed.

Collision Theory

Explains why different reactions occur at different rates and suggests ways to change the rate of a reaction.

Activation energy

The minimum amount of energy that particles must collide with to react.

Kinetic energy of the particles

The energy associated with the motion of particles.

Catalyst

Substances that speed up the rate of a reaction without being consumed in the reaction.

Surface area to volume ratio

The ratio that affects the rate of reaction in solids.

Pressure of reacting gases

A factor that influences the rate of reaction in gaseous systems.

Enzymes

Biological catalysts made from proteins that speed up reactions in living organisms.

Rate Graphs

Graphical representations used to measure the rate of reactions over time.

Factors affecting the rate of reaction

• Nature of reactants

• Temperature

• Concentration of reactants

• Surface area

• Presence of a catalyst

factors affecting the collision of particles

-Number of particles per unit volume

-Frequency of collisions

-Activation energy

-Kinetic energy of the particles