Reaction Rates Flashcards
1
Q
How does increasing temp change the Boltzmann distribution curve?
A
RIGHT + lower
- Particles on avg. have more kinetic energy + will move faster
2
Q
Conditions for a reaction to occur:
A
- collide in right DIRECTIONS -> facing right way
- have AE -> particles need this much energy to break the bonds to start the reaction
3
Q
What affects RR?
A
- concentration = closer
- pressure = closer
- catalysts = Lower AE
- temperature = more E
4
Q
Methods to measure RR?
A
- vol of gas produced
- loss of mass as gas produced
- change pH
- temp
- analyse samples at regular intervals by titration
5
Q
How to calculate RR?
A
GRADIENT at tangent of curve
dy/dx. change/unit time
6
Q
How do catalysts increase RR?
A
provide alternate REACTION PATHWAY with lower AE
7
Q
Homogeneous catalyst
A
Catalyst SAME state as reactants
8
Q
Heterogeneous catalyst
A
Catalyst DIFFERENT state to reactants
9
Q
How does a homogeneous catalyst work?
A
Reactants –>INTERMEDIATE COMPOUNDS –> products
= lower AE than to make product directly
*enthalpy profile has 2 humps
