Topic 6 Test Review Flashcards
1
Q
unit for rate of reaction
A
mol dm⁻³ s⁻¹
2
Q
Forms of measuring rate of reaction
A
- collecting gas
- mass loss
- colour change
- obscured cross
- iodine clock
- pH
- temperature change
3
Q
Rates
A
- average rate
- instantaneous rate
- initial rate
4
Q
what are catalysts?
A
substances that increase the rate of chemical reactions without being used up
5
Q
what do catalysts do?
A
provide an alternative pathway with a lower activation energy (increasing the proportion of particles with activation energy)
6
Q
collision theory
A
reactions occur as a result of two particles colliding at their activation energy and correct orientation
7
Q
types of catalysts
A
homogeneous; heterogeneous
8
Q
methods of speeding up a reaction
A
- increase temperature
- adding a catalyst
- breaking up the substance, increases surface area (solids)
- decrease size of container (gas)
- increase concentration of substance
9
Q
effects of changing the temperature of reactions
A
- increased frequency of collisions
- increased number of particles with enough energy to overcome activation energy
10
Q
Activation energy
A
minimum energy required for colliding particles to react
