Rate of Reaction
By Mia Mavropoulos 9A
The question
Chemical Reactions
Catalyst
A Catalysts is a substance that is used to increase the rate of reaction without being used up. They do this by lowering the activation energy. With a catalyst, more collisions result in a reaction, so the rate of reaction increases. Different reactions need different catalysts.
What factors affect the rate of reaction?
Temperature (heat/energy) because the more energy the faster they move so there are more collisions between the molecules
Concentration (amount) because if you increase concentration... The reaction will happen faster.
Surface area... For example if you are stuck in the middle of a crowd, it'll be hard to get out... But if the people are spread apart, it'll be easy to move around.
Measuring rates
Collision
For a chemical reaction to occur, the reactant particles must collide. Collisions with too little energy do not produce a reaction. You need enough energy for a reaction to occur. The least amount of energy needed for particles to react is called the activation energy.