Topic 6: Rate of reactions Flashcards
1
Q
how does temperature affect the rate of successful collisions?
A
- if you increase the temperature
- the particles will gain more kinetic energy
- this allows the particles to move faster
- meaning there will be more frequent successful collisions
2
Q
how does catalysts affect the rate of reaction?
A
- speeds up the rate of reaction
- by decreasing the activation energy
- by providing an alternate reaction pathway
- for the reaction to take place
3
Q
how does surface to volume ratio affect the rate of reaction?
A
- increases the rate of reaction
- meaning that the area that is exposed for collision is greater
- meaning the frequency of successful collisions increases
4
Q
how does the concentration affect the rate of reaction?
A
- allows there to be more frequent successful collisions
- when increasing the concentration
- as there are more particles in a given volume
5
Q
what happens to the equilibrium when you increase the temperature of the system?
A
- if i increase the temperature of the system
- the equilibrium will shift to the right
- to oppose the increase in temperature
- the forward reaction is endothermic
- the forward reaction will occur at a faster rate
- the yield of C + D increases
6
Q
what happens when you increase the temperature of a system with the forward reaction being exothermic?
A
- when i increase the temperature of the system
- the equilibrium will shift to the left
- to oppose the increase in temperature
- the reverse reaction is endothermic
- the reverse reaction will occur at a faster rate
- therefore, the yield of A + B increases
7
Q
what is the method to calculate the rate of reaction at a specific time?
A
- draw a tangents which matches the steepness of the curve at the given point
- pick 2 points on the tangent
- draw lines to across to the y-axis and down the x-axis from both points
- find the change in y and the change in x
- use the equation change in y/change in x to find the gradient
- check the units
