Chem - Rates Of Reaction

Question 1

How do you calculate the mean rate of reaction

Answer 1

Quantity of product formed/time taken

Question 2

What are the units of rate of reactions

Answer 2

g/s or cm^3/s

Question 3

What are the five factors which can affect the rate of reaction

Answer 3

1. Presence of a catalyst
2. Pressure of gasses
3. Surface area of solids
4. Concentration of liquids
5. Temperature

Question 4

What is collision theory in terms of temperature

Answer 4

A higher temperature means a higher frequency of collisions within a set time and more particles with the required activation energy for a reaction

Question 5

What is collision theory in terms of surface area

Answer 5

The larger the surface area the more exposed particles there are and so the more frequent collisions within a set time there is

Question 6

What is collision theory in terms of gas pressure

Answer 6

Per unit of space a higher gas pressure will have a larger amount of reactants leading to a higher frequency of collisions in a given time

Question 7

What is collision theory in terms of concentration

Answer 7

Per unit of solution a higher concentration will have a larger amount of reactants leading to a higher frequency of collisions in a given time

Question 8

What is the purpose of a catalyst

Answer 8

To increase the rate of reaction by providing the reactants with a different pathway which requires less activation energy