Rates of Reaction

Rates Of Reaction

· A chemical reaction involves a collision between particles.

· The particles collide and make new substances

· The particles which react are called the reactants

· The substances which are made are called the products

How do we make the reaction go faster?

There are four things that we can change to make the reaction go faster.

They are

Temperature

Surface area

Concentration

Using a catalyst

Temperature

When we increase the temperature we give the particles energy

This makes them move faster

This means they collide with other particles more often

So the reaction goes faster.

Surface area

If we make the pieces of the reactants smaller we increase the number of particles on the surface which can react.

This makes the reaction faster


The particles on the surface can react

The particles on the surface can react

When cut into smaller pieces the particles on the inside can react

When cut into smaller pieces the particles on the inside can react

Concentration

If we make one reactant more concentrated (like making a drink of orange squash more concentrated)

There are more particles in the same volume to react

So the reaction goes faster.

a) There are less red particles in the same volume so there is less chance of a collision

b) There are more red particles in the same volume so there is more chance of a collision so the reaction goes faster

A catalyst is a chemical which is added to a reaction.

It makes the reaction go faster.

The catalyst does not get used up in the reaction.

It gives the reaction the energy to get started

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~ by haqifaitis on March 31, 2009.

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