18.1 - Rates of reactions 2

Question 1

How can you calculate rate of reaction using concentration?

Answer 1

Rate = change in concentration / time

Question 2

What is the rate of reaction proportional to?

Answer 2

The concentration of a particular reactant raised to a power.
The power is the order of reaction for that reactant.

Question 3

What is a zero order reactant?

Answer 3

The concentration of that reactant has no effect on the rate.

Question 4

What is a first order reactant?

Answer 4

The rate depends on the concentration of the reactant raised to the power of 1.
e.g. doubling the concentration (x2) doubles the rate (x2)

Question 5

What is a second order reactant?

Answer 5

The rate depends on the concentration of the reactant raised t the power of two.
e.g. doubling the concentration (x2) increases the rate by a factor of 4 (x4) because 2² = 4

Question 6

What is the rate equation?

Answer 6

The rate equation gives the mathematical relationship between the concentrations of the reactants and the reaction rate.

Question 7

What is the rate constant?

Answer 7

The rate constant k is the proportionality constant. It is the number that mathematically converts between the rate of reaction and concentration and orders.

Question 8

What is the overall order of a reaction?

Answer 8

The overall order of a reaction gives the overall effect of the concentrations of all reactants on the rate of reaction.
Overall order = sum of all orders with respect to each reactant