Chemistry - How Fast? Flashcards
What is a catalyst?
A catalyst is a substance that can increase the rate of reaction without being used up itself.
They provide an alternative reaction pathway with a lower activation energy meaning that more particles will have sufficient energy to overcome the energy barrier and react.
What is concentration?
The amount of particles dissolved in a solution.
How do you do the following things?
- Increase the particle speed
- Make there be more particles present
- Particles with more energy
- Lower activation energy
Increase the particle speed - higher temperature Make there be more particles present - higher concentration
Particles with more energy - higher temperature
Lower activation energy - use a catalyst
How does changing the surface area affect the rate of reaction?
The higher the surface area the faster the rate of reaction. Because with higher surface area it is easier to hit more particles.
What has a larger surface area, marble chips or powder?
Marble powder.
How does temperature affect the rate of reaction.
The higher the temperature the quicker the reaction because the particles will have more energy so they will collide with each other more and therefore react quicker.
What is activation energy?
The minimum amount of energy particles need to have a successful collision.
What does increasing the concentration do?
More frequent collisions therefore increased rate of reaction.
How can we measure the rate of reaction?
Measure the rate at which a reactant is used up.
Measure the rate at which a product is formed.
