Factors Affecting Rate

What factors affect rate

Surface Area, Concentration, Pressure, Temperature

Repeatable

I do it lots and get the same results

Reproducable

Others do it lots and get the same results

Collision Theory

Many reacting particles, more frequent collisions

Concentration

Higher concentration, faster rate of reaction.

Surface Area

Larger surface area, faster rate of reaction.

Pressure

Increased pressure, faster rate of reaction.

How is pressure caused?

Gas particles colliding with container walls

Temperature

Increased temperature, faster rate of reaction.

GRAPHS: Fast (steep gradient)

Many reacting particles, very frequent collisions

GRAPHS: Slower (less steep gradient)

Fewer reacting particles, less frequent collisions.

When does a reaction stop?

When one reactant has been used up so there are no more collisions.