Topic 6: Chemical kinetics

Question 1

Rate of reaction

Answer 1

increase in the concentration of one of the products per unit time or decrease in the concentration of one of the reactants per unit time

measured in mol dm^-3 s^-1

Question 2

How to measure rate of reaction

Answer 2

measure the change in concentration, measure mass or volume change when a gas is evolved, absorption using spectrometer when there is a colour change, pH changes when there is a change in acidity and electrical conductivity when there is a change in ionic concentration

Question 3

How to find rate of reaction at a single point in time using graph

Answer 3

find the gradient of the graph at that point in time

Question 4

what is maxwell boltzmann distribution

Answer 4

moving particles in gas or liquid dont travel at same velocity, the distribution shows the different kinetic energies of particles (the faster the move the more kinetic energy)

y axis - number of particles
x - axis - kinetic energy

temperature increases kinetic energy (however area under curve remains the same)

Question 5

Collision theory

Answer 5

1. particles must collide
2. particles must collide with correct geometry so reactive parts come in contact
3. particles must have sufficient energy, higher than activation energy