rates of reaction Flashcards
1
Q
How do you measure the rate of a reaction?
A
- measure rate a reactant is used up
- measure rate product is formed
2
Q
What are 2 common practical methods for determining rate of reaction?
A
- collect gas produced
- observed colour change
3
Q
In collision theory, explain sufficient and insufficient energy.
A
If sufficient - they will react.
If insufficient - collision won’t result in chemical change.
4
Q
What are the 3 key factors affecting rate of a reaction?
A
- concentration
- temperature
- surface area
5
Q
Surface area increases as…
A
Particle size decreases.
6
Q
What do catalysts do?
A
- speed up rate of reaction without themselves being altered
- lower activation energy
7
Q
What do enzymes and glucose form?
A
Carbon dioxide and ethanol.
8
Q
What is an exo vs endothermic reaction?
A
Exo - more energy given out than absorbed to make bonds (-)
Endo - more energy absorbed than released to break bonds (+)
9
Q
A
10
Q
What’s the method for effect of surface area?
A
- Measure 5g of large marble chips into conical flask
- Measure 50cm3 of hydrochloric acid into measuring cylinder
- Add hydrochloric acid to conical flask and start timer
- Record volume of co2 produced every 10 seconds until 100cm3 has been collected
- Repeat for medium and small
11
Q
What is activation energy?
A
The minimum energy the colliding particles need in order to react?
12
Q
A
