Rates of reaction

Question 1

ROR

Answer 1

The rate of a chemical reaction is the change in concentration of a reactant or a product by unit time

Question 2

Order of reaction

Answer 2

Indicates how the concentration of a reactant affects the rate of reaction

Question 3

Half life

Answer 3

The half-life of reactant is the time taken for the concentration of the reactant to fall to half of its original concentration

Question 4

Rate determining step

Answer 4

The rate determining step is the slowest step of a reaction mechanism of a multi step reaction

Question 5

activation energy

Answer 5

The minimum energy required for reaction to take place by the breaking of bonds in the reactants

Question 6

effect of temperature on ROR

Answer 6

•as the temp of a reaction mixture is increased, the ROR INCREASES

• at a higher temp the average energy of the molecules increases

• a greater proportion of molecules have energy GREATER THAN or EQUAL TO the activation energy

• more FREQUENT successful collisions occur

Question 7

factors which affect the rate of chemical reaction

Answer 7

•concentration of reactant
•temperature
•use of a catalyst
•surface area (for solids)
•pressure (for gases only)

Question 8

The simple collision theory

Answer 8

For a chemical reaction to occur molecules must …
•collide with each other
•have energy greater than equal to the activation energy
•must collide in the correct orientation