C6 : Rates Flashcards
What is rate ?
Measure of how fast a reaction goes
Amount of reactants used up */ time
- also amount of products produced
When does a reaction occur?
When particles collide with enough energy to react
What is activation energy (Ea)
This is the minimum amount of energy required in a collision for the particles to react
The more successful particle collisions per second he greater the rate of reaction
5 factors that effect the rate of reaction ?
^ temperature ^ concentration ^ pressure ^ surface area Use a catalyst
How does temperature effect rate of reaction ?
^ temperature =
- increase rate of reaction
- increase number of successful particle collision per second as..
- increase number of reactant particles have the required (Ea)
How does concentration effect rate of reaction ?
^ concentration =
•increase rate of reaction as ..
- increase number of particles so..
- increase number of successful particle collisions per second
How does pressure effect rate of reaction ?
- gases only
^ pressure =
- increase rate of reaction as ..
- increase number of successful particle collisions per Second
How does surface area effect the rate of reaction ?
^ surface area =
- increase rate of reaction as ..
- increase number of particles available for collisions so …
- increases number of successful particles collisions per second
What is a catalyst
A catalyst is a substance that increases the rate of reaction - without being used itself
How does a catalyst effect the rate of reaction
A catalyst
- increases rate of reaction.. by..
- increasing successful particle collisions per second.. by..
- lowering the activation energy by
- providing an alternative reaction pathway
3 advantages of a catalyst?
Saves time
Saves energy
Saves money
3 disadvantages of a catalyst?
Expensive
Can be poisoned or destroyed
Specific to a reaction
