Kinetics - Factors affecting rate of reaction Flashcards
1
Q
What is the Rate of Reation?
A
Change in concentration of a reactant (or product) per unit time
2
Q
how do you measure the rate of reaction?
A
3
Q
How do you calculate moles?
A
4
Q
How to calculate concentration?
A
5
Q
Effect of temperature on ROR
A
- particles will have increased kinetic energy
- this increases the frequency of collisions so higher number of successful collisions
- a higher proportion have the activation energy.
6
Q
Effect of concentration on the ROR
A
- the more concentrated a solution is, the greater the number of particles in a given solvent
- an increase in concentration causes an increase collision frequency and therefore increases ROR.
7
Q
Effect of pressure on the ROR.
A
- When there is increased pressure, molecules have less space in which they can move
- the number of effective collisions increases due to an increased collision frequency
8
Q
What is catalysis?
A
The process in which the rate of a chemical reaction is increased by adding a catalyst
9
Q
How does a catalyst increase ROR
A
- It provides the reactants with an alternative reaction pathway which is lower in activation energy than the uncatalysed reaction.
- particle collisions need less energy in order for a reaction to occur
10
Q
What are the two types of catalysts
A
- homogeneous - same phase as reactants
- heterogeneous - different phase.
11
Q
effect of SA on the ROR
A
Increased surface area of solid reactants increases the number of particles that are exposed and available to react.
- this increases the frequency of particle collisions
