Rocks and Rocks and builidingbuiliding

1.2 Limestone and it’s uses1.2 Limestone and it’s uses

Learning objectivesLearning objectives

Know some of the different uses of Know some of the different uses of limestonelimestone

Understand what happens during Understand what happens during the thermal decomposition of the thermal decomposition of limestonelimestone

What are they made of?What are they made of?

Uses of Uses of LimestoneLimestone

Making glass

Improving soil fertility

And even the tourist trade…

Making concrete

Buildings

Calcium CarbonateCalcium Carbonate

Formed from tiny animals from Formed from tiny animals from millions of years agomillions of years ago

Can be quarried from groundCan be quarried from ground Cut into blocksCut into blocks

Used as building materialUsed as building material Powered limestonePowered limestone

Heated with powdered clay – cementHeated with powdered clay – cement Can be used to make concreteCan be used to make concrete

GlassGlass

Powdered limestonePowdered limestone Heated with sand and sodaHeated with sand and soda Produces glassProduces glass LiquidLiquid Flows over 100’s of yearsFlows over 100’s of years

Or does it?Or does it?

Uses of limestoneUses of limestone

Produce an A4 Produce an A4 advert for limestoneadvert for limestone

Powerpoint or wordPowerpoint or word Must include:Must include:

Where limestone Where limestone comes fromcomes from

The chemical nameThe chemical name 3 uses and how it is 3 uses and how it is

usedused

Limestone!!!

It’s great!!!

Blah Blah Blah etc etc etc

What is it etc

What’s it for etc

Heating limestoneHeating limestone

Limestone – Calcium carbonate CaCOLimestone – Calcium carbonate CaCO33 Which atoms?Which atoms?

Heat strongly – breaks down into Heat strongly – breaks down into quicklime (CaO)quicklime (CaO) Releases carbon dioxideReleases carbon dioxide Thermal decompositionThermal decomposition

Lime KilnLime KilnCalcium carbonateCalcium carbonate calcium oxide + calcium oxide +

carbon dioxidecarbon dioxideLimestoneLimestone QuicklimeQuicklime

Lime kilnLime kiln

Key pointsKey points

Limestone is mainly made of calcium Limestone is mainly made of calcium carbonatecarbonate

Limestone is widely used in buildingLimestone is widely used in building Limestone breaks down when you Limestone breaks down when you

heat it strongly (thermal heat it strongly (thermal decomposition) to make quicklime decomposition) to make quicklime and carbon dioxideand carbon dioxide