Energy changes and chemical reaction

Chemical bonds contain what form of energy?

In an endothermic reactions; reactants → products + thermal energy.

In an exothermic reaction; reactants + thermal energy → products

Activation energy is the minimum amount of energy needed to start a chemical reaction.

If a reaction has high activation energy, less energy is needed to start the reaction.

The rate of a reaction is the volume at which it occurs

Chemical reactions occur faster if particles collide less often or move slower when they collide.

At higher temperatures, the average speed of particles is greater, particles collide more often, and collisions with more energy are more likely to break chemical bonds.

At higher temperatures, the average speed of particles is decrease.

Increasing the concentration of one or more reactants increases collisions between particles, resulting in a fast reaction rate.

In gases, an increase in pressure pushes gas particles closer together, resulting in less collisions.

A catalyst is a substance that slows, or even stops, a chemical reaction.