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Thermal Decomposition of Calcium Carbonate

In this worksheet, students examine how calcium carbonate is decomposed with heat and the use of related materials in construction.

'Thermal Decomposition of Calcium Carbonate' worksheet

Key stage:  KS 4

Curriculum topic:  Chemistry: Chemical and Allied Industries

Curriculum subtopic:  Carbon Compounds

Difficulty level:  

down

Worksheet Overview

QUESTION 1 of 10

Materials dug out of the Earth are used for constructing buildings. Limestone, marble and granite are mined from quarries. Brick, concrete, cement, glass, iron and other metals also come from the ground, but they need to be processed before being used. Clay is used to make bricks; limestone and clay make cement; sand is manufactured to make glass and metals are extracted from their ores.


Limestone is chemically called calcium carbonate. It decomposes (breaks down) when heated. The word equation for the thermal decomposition of limestone is:


 

 

The reaction can be written in chemical symbols as well:



Cement is made by adding clay to heated limestone. Sand and gravel are mixed with cement and water to make concrete.

Cement can also be mixed with sand and water to make mortar, which is used to stick bricks together when building.

To make reinforced concrete, normal concrete is poured around steel rods. Concrete on its own is strong when squashed (compressed), but weaker when pulled. Steel rods or mesh in reinforced concrete increase its strength under tension (pulling).

 


Quarries are sources of a lot of materials, but also create environmental problems. The landscape is damaged and there is a lot of noise and dust pollution from machinery and explosives used, as well as lorries that transport the materials.

Select two materials that need processing before being used in construction.
cement

marble

limestone

brick

What is the common name for calcium carbonate?

What do we call the places that extract materials from the ground?
power plants

factories

clinics

quarries

What is added to limestone to make cement?

What is the gas produced from the thermal decomposition of calcium carbonate?

oxygen

hydrogen

carbon dioxide

nitrogen

What is the chemical formula of calcium oxide?
CO2

CaO

COa

What do you make when mixing cement with sand and water?
concrete

mortar

clay

What is the metallic material used in reinforced concrete?

 

iron

aluminium

steel

copper

What do we call a squashing or pushing force?

tension

detention

compression

formation

What type of environmental pollution is created by quarries? Select two boxes.
chemical

noise

dust

radioactive

  • Question 1
Select two materials that need processing before being used in construction.
CORRECT ANSWER
cement
brick
EDDIE SAYS
Bricks and cement need processing before being used in construction, they are not naturally occurring materials.
  • Question 2

What is the common name for calcium carbonate?

CORRECT ANSWER
limestone
EDDIE SAYS
The common name for calcium carbonate is limestone.
  • Question 3
What do we call the places that extract materials from the ground?
CORRECT ANSWER
quarries
EDDIE SAYS
Materials are extracted from the ground in quarries.
  • Question 4
What is added to limestone to make cement?
CORRECT ANSWER
clay
EDDIE SAYS
Clay is added to limestone to make cement.
  • Question 5

What is the gas produced from the thermal decomposition of calcium carbonate?

CORRECT ANSWER
carbon dioxide
EDDIE SAYS
Carbon dioxide is the gas produced from the thermal decomposition of calcium carbonate.
  • Question 6
What is the chemical formula of calcium oxide?
CORRECT ANSWER
CaO
EDDIE SAYS
The chemical formula of calcium oxide is CaO.
  • Question 7
What do you make when mixing cement with sand and water?
CORRECT ANSWER
mortar
EDDIE SAYS
Mortar is made when mixing cement with sand and water.
  • Question 8

What is the metallic material used in reinforced concrete?

 

CORRECT ANSWER
steel
EDDIE SAYS
Steel is used in reinforced concrete.
  • Question 9
What do we call a squashing or pushing force?

CORRECT ANSWER
compression
EDDIE SAYS
A squashing or pushing force is called compression.
  • Question 10
What type of environmental pollution is created by quarries? Select two boxes.
CORRECT ANSWER
noise
dust
EDDIE SAYS
Dust and noise pollution are created by quarries.
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