Collision theory Flashcards
What does collision theory state? What is the general idea?
The rate of reaction depends on how often and how hard the reacting particles collide with each other
The basic idea is that particles have to collide in order to react and they have to collide hard enough (with enough energy)
More collisions [ ] the rate of reaction
The effects of temperature, [ ] and surface area on the rate of reaction can be explained in terms of how often the [ ] particles collide [ ]
increases
concentration
reacting
successfully
[ ] temperature increases collisions. Why?
Higher
When the temp is increased the particles all move quicker. If they’re moving quicker, they’re going to collide more often
Higher [ ] (or pressure) increases collisions
concentration
Why does increasing the concentration increase collisions?
If a solution is more concentrated git means there are more particles of react between the water molecules which makes collisions between the water molecules which makes collisions between the important particles more likely
Why does increasing the Pressure increase collisions?
In a gas, increasing pressure means the particles are more squashed up together so there will be more frequent collisions
Larger surface area increase collisions. Why?
This means the particles around it in the solution will have more area to work on, so there’ll be more frequent collisions
Faster collisions increases the…
rate of reaction
Increasing the temperature causes [ ]
faster collisions
Higher temp also increase the [ ] of the collisions, because it makes all the particles [ ]
energy
move faster
What is the activation energy?
Reactions only happen is the particles collide with enough energy. The minimum amount of energy need b the particles to react = activation energy
At a higher temp there’ll be [ ] colliding with enough [ ] to make the reaction happen
more particles
energy
