2.2 Rates of Reaction Flashcards
1
Q
5 influences on rate
A
- concentration
- temperature
- pressure
- surface area
- catalyst
2
Q
Practical methods to measure rates
A
- volume of gas produced using gas syringe
- change in mass
- colour change
- precipitate formation
3
Q
Influence of temp on RoR
A
- increased KE or particles increases chance of successful collision, resulting in greater rate of reaction
4
Q
Influence of concentration on RoR
A
- increased number of molecules per unit volume resist in increased chance of collision, so an increased chance of successful collision
5
Q
Influence of pressure on RoR
A
- increased number of molecules per unit volume so an increased chance of successful collision
6
Q
Influence of surface area on RoR
A
- increased SA results in increased sites for collision and so increased chance of success
7
Q
Influence of catalyst on RoR
A
- provides an alternate reaction route with a lower activation energy
8
Q
Draw a Boltzmann graph for normal, increased, and decreased temp
A
9
Q
What does areas under graph of Boltzman curve signify?
A
Number of particles
10
Q
What enables a reaction to be successful?
A
- reactant particles collide with correct orientation and with energy greater than or equal to the activation energy
11
Q
Define rate of reaction
A
- change in quantity of reactant or product over time
12
Q
Equation for rate
A
Rate = change in conc
———————
Time
13
Q
Key features of a Boltzman graph
A
- highest peak shows most probable energy at that temp
- mean energy of all particles is slightly higher than probable energy
- no particles with energy value of zero
14
Q
Temperature on Boltzman
A
- peak shift to the right
- area under does not change
15
Q
Rate equation (iodine clock)
A
Rate = 1
———
Time
