Kinetics II

Question 1

Define rate of reaction

Answer 1

The change in concentration of a species divided by the time it takes for the change to occur

Question 2

Is the value for rate of reaction positive or negative?

Answer 2

Positive value

Question 3

What is the unit for rate of reaction?

Answer 3

mol dm⁻³ s⁻¹

Question 4

What are the equations for calculating rate of reaction?

Answer 4

The concentration of the product increases with time

The concentration of the reactant decreases with time, so the negative sign gives it a positive value

Question 5

What is necessary to know before measuring the rate of reaction?

Answer 5

The overall equation, including state symbols

Question 6

What does the method chosen to measure the rate of reaction depend on?

Answer 6

• The states of the reactants and products
• The condition the reaction was carried out under

Question 7

What are the six methods for measuring the rate of reaction?

Answer 7

1. Mesuring the volume of gas evolved
2. Measuring the change in mass of a reaction
3. Monitoring thr change in intensity of colour of a reaction mixture (colorimetry)
4. Measuring the change in concentration of a reactant or product using titration
5. Measuring the change in pH of a solution
6. Measuring the change in electrical conductivity of a reaction mixture