Reactivity 2.2 + 2.3 - The rate of chemical change Flashcards
(24 cards)
Unit for rate of reaction
mol dm^-3 s^-1
What is the gradient of the tangent indicative of in a reaction diagram
Rate of reaction
Relationship between absolute temperature and average kinetic energy
Proportional
What are the two conditions in collision theory
- Must collide with energy equal to or greater than activation energy
- Must collide with correct orientation
4 factors that increase reaction rate
- Increased temp
- Increased concentration
- Increased pressure
- Smaller particle size
General rate expression
The order of reaction are experimentally determined. They are NOT the coefficients.
How does a catalyst affect rate constant k
Increases it
Do catalysts appear in the rate determining step
yes
Where do catalysts appear in the full reaction?
In the reactant of the rate determining and the product of one of the later steps
Where do catalysts appear in the over reaction?
nowhere
molecularity meaning
Molecularity refers to the number of reactant particles in an elementary step
Why are termolecular steps rare
low probability of 3 collisions in right orientation
Which step is the rate determining step
The slower step
What if the slower step is step 2
Rearange fuckery
How does the increase in temp affect k
increase exponentially
Arrhenius equation units
Weird way to calculate activation energy
Kc calculation
product/reactants couldnt be bothered to type the exponent stuff
What is Q
its the reaction quotient measured regardless of equilibrium
What factor changes Kc
Temperature
What are the three factors that affect equilbrium
- Temperature
- Concentration
- Pressure - affected by volume
alternate formula for gibbs free energy (non standard)
When does the equilibrium lean towards the pure product
for spontaneous reactions
When does Q = K in terms of gibbs free energy
when gibbs free is at a minimum
