# Worksheet: Reaction Rates

In this worksheet, we will practice calculating reaction rates using variables such as concentration, pressure, conductivity, and optical absorption.

**Q1: **

Ammonia decomposes into hydrogen and nitrogen at high temperature. The rate of decomposition of ammonia is found to be M/s.

Write a balanced chemical equation for this reaction.

- A
- B
- C
- D
- E

What is the rate of formation of nitrogen?

- A M/s
- B M/s
- C M/s
- D M/s
- E M/s

What is the rate of formation of hydrogen?

- A M/s
- B M/s
- C M/s
- D M/s
- E M/s

**Q2: **

Aqueous hydrogen peroxide () decomposes into oxygen and water. The rate of decomposition of hydrogen peroxide is found to be M/h.

Write a balanced chemical equation for this reaction.

- A
- B
- C
- D
- E

What is the rate of formation of water?

- A M/h
- B M/h
- C M/h
- D M/h
- E M/h

What is the rate of formation of oxygen?

- A M/h
- B M/h
- C M/h
- D M/h
- E M/h

**Q5: **

A reaction begins at a time and is monitored over a period of time, , by measuring the reactant concentration, , at fixed time intervals. How is the average rate of reaction for this time period calculated from a graph of against ?

- ABy calculating the total area under the graph between and
- BBy calculating the gradient of the tangent at
- CBy fitting a polynomial function to the curve and evaluating the derivative of this function at
- DBy calculating the gradient of the tangent at
- EBy dividing the change in between and by

**Q6: **

A reaction begins at a time and is monitored over a period of time, , by measuring the reactant concentration, , at fixed time intervals. How is the instantaneous rate at calculated from a graph of against ?

- ABy dividing the change in between and by
- BBy calculating the total area under the graph between and
- CBy calculating the gradient of the tangent at
- DBy fitting a polynomial function to the curve and evaluating the derivative of this function at
- EBy calculating the gradient of the tangent at