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Lesson Sequence

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C1 part 1 C1 Lesson 7 Conservation of mass C1 Lesson 10 Carbonates
Year 9

Learning outcomes and Specification referenceEdit

C1.2.1 Calcium carbonate C1 Lesson 8&9 Calcium Carbonate
a Limestone, mainly composed of the compound calcium carbonate (CaCO3), is quarried and can be used as a building material. Know that limestone is calcium carbonate and that it is quarried.
b Calcium carbonate can be decomposed by heating (thermal decomposition) to make calcium oxide and carbon dioxide. Know that, when heated limestone becomes calcium oxide giving off carbon dioxide.
d Calcium oxide reacts with water to produce calcium hydroxide, which is an alkali that can be used in the neutralisation of acids. Know that calcium oxide reacts with water to make calcium hydroxide.
e A solution of calcium hydroxide in water (limewater) reacts with carbon dioxide to produce calcium carbonate. Limewater is used as a test for carbon dioxide. Carbon dioxide turns limewater cloudy. Know that: calcium hydroxide is an alkali that neutralises acids calcium hydroxide dissolves in water to make a solution called limewater limewater reacts with carbon dioxide to make calcium carbonate this reaction is a test for carbon dioxide as the solution goes cloudy.

Full Specification TextEdit

a) Limestone, mainly composed of the compound calcium carbonate (CaCO3), is quarried and can
be used as a building material.

b) Calcium carbonate can be decomposed by heating (thermal decomposition) to make calcium oxide and carbon dioxide.
c) The carbonates of magnesium, copper, zinc, calcium and sodium decompose on heating in a similar way.
d) Calcium oxide reacts with water to produce calcium hydroxide, which is an alkali that can be used in the
neutralisation of acids.
e) A solution of calcium hydroxide in water (limewater) reacts with carbon dioxide to produce calcium
carbonate. Limewater is used as a test for carbon dioxide. Carbon dioxide turns limewater cloudy.

Starter ActivitiesEdit

Activities to introduce new ideasEdit

  • No activities have been added to this lesson plan in this section

Activities to practice applying new knowledgeEdit


  • Worksheet to practice writing word equations and introduce chemical formulae for the limecycleFile:Lime Cycle.doc

Practical activitiesEdit

DemonstrationsEdit

  • Get a large piece of chalk ( same chemical formula as limestone) and roast in a bunsen burner and then add a few drops of water.

Class practicalsEdit

  • 5 step practical . 1. Heat a piece of limestone strongly with a bunsen on a tin lid or held with some nichrome wire for 10 mins to make CaO ( lime or quicklime) 2. Allow to cool. Add water with a pipette a drop at a time until the reaction stops making calcium hydroxide ( slaked lime). 3. Push all the white solid into excess water and filter making calcium hydroxide solution ( limewater). 4. Blow into the clear solution with a straw. It goes cloudy demonstrating the test for carbon dioxide. Tiny bits of calcium carbonate are formed making it cloudy.5. Add universal indicator and test pH ( alkaline)
  • AQA Practical Guide: Chemistry of Limestone Cycle
  • Heat other carbonates eg magnesium and zinc in a boiling tube and have the delivery tube into a test tube of limewater and see how long it takes to turn cloudy

LinksEdit

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References to lessons and resources in commercial schemesEdit

Nelson ThornesEdit

OUPEdit

Harper CollinsEdit

Longman/PearsonEdit

Hodder
Calcium carbonate
Edit

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