Loading please wait

The smart way to improve grades

Comprehensive & curriculum aligned

Try an activity or get started for free

Explain the Industrial Uses of Thermal Decomposition

In this worksheet, students will explain the industrial uses of thermal decomposition reactions.

'Explain the Industrial Uses of Thermal Decomposition ' worksheet

Key stage:  KS 3

Year:  Year 9 Science worksheets

Curriculum topic:   Chemistry: Chemical Reactions

Curriculum subtopic:   Types of Chemical Reactions

Difficulty level:  

Worksheet Overview

Some compounds decompose (or break down) when they are heated to sufficiently high temperatures.
These reactions are called thermal decomposition reactions.


Thermal decomposition reactions are endothermic since energy is required to break the chemical bonds and separate the constituent elements, and so requires energy to be supplied to the reactants in the form of heat.


Calcium carbonate is the chemical name for limestone. Limestone is a type of sedimentary rock.




Calcium carbonate decomposes on an industrial scale into calcium oxide and carbon dioxide when heated above 825oC in a lime kiln. The chemical reaction is as follows:


Calcium carbonate (limestone)    ⇔  Calcium oxide (quicklime) + carbon dioxide

                CaCO3     ⇔         CaO + CO2


Another name for calcium oxide is quicklime. Quicklime is very important in industry. The main use of quicklime is in the steel making process, paper making and cement making. 


This reaction is a reversible reaction - this is because the quicklime is not stable and, when cooled, will spontaneously react with CO2 from the air until it is completely converted back to calcium carbonate unless slaked with water.


Ready to try some questions now?

What is EdPlace?

We're your National Curriculum aligned online education content provider helping each child succeed in English, maths and science from year 1 to GCSE. With an EdPlace account you’ll be able to track and measure progress, helping each child achieve their best. We build confidence and attainment by personalising each child’s learning at a level that suits them.

Get started

Try an activity or get started for free

  • National Tutoring Awards 2023 Shortlisted / Parents
    National Tutoring Awards 2023 Shortlisted
  • Private-Tutoring-WINNER-EducationInvestor-Awards / Parents
    Winner - Private Tutoring
  • Bett Awards Finalist / Parents
  • Winner - Best for Home Learning / Parents
    Winner - Best for Home Learning / Parents