Rates of Reaction Flashcards
How would you calculate the rate of a reaction?
Amount of reactant used divided by the time taken.
Why does something with a high pressure have a higher rate of reaction?
The particles are pushed together therefore there will be more collisions.
What does a catalyst do to the rate of a chemical reaction?
Speeds it up.
What do catalyst’s do in a reaction?
Lower the activation energy.
What happens when you increase the temperature of a reactant?
As the temp increases the particles gain more energy and move faster. This means a higher frequency of collisions. More successful high energy collisions or more collisions greater than the activation barrier.
What happens when you increase the concentration of a reactant?
As you increase concentration the rate of reaction increases because there’s more particles in a given volume. Therefore the frequency of collisions increases.
What is meant by ‘concentration’?
Same total number of particles in given volume of space.
What is ‘collision theory’?
Two chemicals collide with enough energy to cause a reaction.
Name 4 factors which effect the rate of a reaction.
- Temperature
- Concentration of solutions
- Pressure of gasses
- Surface area of solids
- Catalyst
What is the ‘activation energy’?
The minimum amount of energy needed for the particles to react.
When do reactions occur?
When particles collide with eachother.
