Send the link below via email or IMCopy
Present to your audienceStart remote presentation
- Invited audience members will follow you as you navigate and present
- People invited to a presentation do not need a Prezi account
- This link expires 10 minutes after you close the presentation
- A maximum of 30 users can follow your presentation
- Learn more about this feature in our knowledge base article
Do you really want to delete this prezi?
Neither you, nor the coeditors you shared it with will be able to recover it again.
Make your likes visible on Facebook?
Connect your Facebook account to Prezi and let your likes appear on your timeline.
You can change this under Settings & Account at any time.
IGCSE Chemistry - Rate of Reaction
Transcript of IGCSE Chemistry - Rate of Reaction
When there is a bigger surface area there is more chance of particles colliding so with small particles the reaction rate is faster.
Increasing surface area increases the rate of a reaction. Collision Theory Particles only react when they collide.
However, not all collisions cause a reaction to occur. The particles must possess a certain minimum energy before they will react when they collide.
The minimum energy required for a reaction to occur is called the ACTIVATION ENERGY. Changing Concentration Increasing the concentration of a solution means that there are more particles per unit volume. As there are more particles in the same volume there are more collisions between particles.
Increasing the concentration of a solution increases the rate of reaction. Changing Temperature When the temperature is increased the particles gain energy so are moving faster and collide more often. They also collide with more energy. At a higher temperature there are many more particles with energy greater than the ACTIVATION ENERGY so there are far more successful collisions.
Increasing the temperature increases the rate of a reaction. Adding A Catalyst A catalyst speeds up a chemical reaction but is not used up itself.
Catalysts work by lowering the ACTIVATION ENERGY for a reaction so there are many more successful collisions.
Catalysts are widely used in industry to reduce costs. Rate of Reaction