8.1-8.3: Rate of Reactions, (Factors), graphs

________ occurs when there are many fine particles in the air.

When a(n) ________ is used, the rate of reaction will increase.

________ need to have sufficient energy to react when they collide.

Increasing the ________ of a solid increases the collision rate.

There are three things that can effect the ________.

Methane gas mixed with air in coal mines can also form a(n) ________.

Increasing the ________ increases the rate of reaction.

________ (including enzymes) create alternative reaction pathways which have a lower activation energy.

A physical change affects the forces between particles. The particles and their chemical properties remain the same. A chemical affects the chemical properties of the substance.

The minimum amount of energy required for a reaction to occur.

Particles must collide at the correct orientation with sufficient energy to react

Increase the temperature.

• Increase the concentration.

• Increase surface area to volume ratio. - Add a catalyst.

• Increase the pressure (for gases).

Increasing the surface area of reactants increases the rate of reaction because there are more exposed particles so more frequent successful collisions.

A biological catalyst that increases the rate of reactions in living cells without being used up.

Rate of reaction = Amount of reactant used or product formed/ Time (s)

g/s and cm3/s and mol/s