Doc Brown's Chemistry AQA GCSE Science-CHEMISTRY 1 Revision Notes

Chemistry Unit 1 C1.2 Limestone and building materials Study Notes

CHEMISTRY UNIT 1 Chemistry 1 for GCSE Science or GCSE Chemistry

PLEASE NOTE NEW revision summaries for the NEW AQA GCSE Chemistry and NEW AQA GCSE Combined Science Trilogy Chemistry courses: Revision for Paper 1 (Topics 1-5 and 8-12) and  Paper 2 (Topics 6-10 and 13-17) STARTING with Y10 in Sept. 2016 onwards, first exams in 2018

REVISION NOTES GUIDE SUMMARY: What do you need to know for the examinations? What do you need to able to do in the exams? In AQA GCSE Science A examinations HT means for higher tier students only. Sorry, but I don't have much time to answer questions, but if you see any apparent errors or wish to comment, please email me. All my notes, learning objectives, comments for exam revision are based on the official AQA GCSE Science A Key Stage 4 syllabus specification.

  • Throughout this unit you will be expected to write word equations for reactions specified.

  • Higher tier (HT) candidates will also be expected to write and balance symbol equations for reactions specified throughout the unit.

limestone cliffsAQA GCSE Science CHEMISTRY Unit C1.2 Limestone and building materials

  • Know that rocks provide essential building materials.

  • Know that limestone is a naturally occurring resource that provides a starting point for the manufacture of cement and concrete.

  • Using your skills, knowledge and understanding you are expected to be able to:

    • consider and evaluate the environmental, social and economic effects of exploiting limestone and producing building materials from it,

    • evaluate the developments in using limestone, cement and concrete as building materials, and their advantages and disadvantages over other materials.

  • useful limestoneYou should know that limestone is needed for buildings and that the positive benefits of using this material should be considered against the negative aspects of quarrying.

  • Your expected knowledge of building materials is limited to limestone, cement and concrete.

  • You are not expected to have knowledge of particular developments, but, information may be supplied in examination questions for you to evaluate.

  • Knowledge of the properties of other building materials is not required, but you may be provided with information about materials such as timber, stone, glass and steels in the examination so that you can make comparisons about their uses.

AQA GCSE Science CHEMISTRY Unit C1.2.1 Calcium carbonate

Limestone Chemistry and Uses (c) doc b

  • a) You should know that limestone is mainly composed of the compound calcium carbonate (CaCO3), is quarried and can be used as a building material.

  • b) Know that calcium carbonate can be decomposed by heating to make calcium oxide and carbon dioxide.

    • You should know this is an example of thermal decomposition, meaning 'breaking down with heat'.

  • c) Know that the carbonates of magnesium, copper, zinc, calcium and sodium decompose on heating in a similar way.

    • Your knowledge and understanding of metal carbonates is limited to metal carbonates decomposing on heating to give carbon dioxide and the metal oxide.

    • You should know that not all carbonates of metals in Group 1 of the periodic table decompose at the temperatures reached by a Bunsen burner flame.

  • d) Calcium oxide reacts with water to produce calcium hydroxide, which is an alkali that can be used in the neutralisation of acids.

    • You do not need to know the common names quicklime and slaked lime for calcium oxide and calcium hydroxide respectively.

  • e) Know that a solution of calcium hydroxide in water (limewater) reacts with carbon dioxide to produce calcium carbonate.

    • Know that limewater is used as a test for carbon dioxide and carbon dioxide turns limewater cloudy (formation of a white precipitate).

      • You should be familiar with using limewater to test for carbon dioxide gas.

  • f) Know that carbonates react with acids to produce carbon dioxide, a salt and water.

    • Know that limestone is damaged by acid rain which reacts with it.

    • Your knowledge of the reaction of carbonates with acids is limited to the reactions of magnesium, copper, zinc, calcium and sodium eg observations, products and equations.

  • g) Know that limestone is heated with clay to make cement.

    • Know that cement is mixed with sand to make mortar and with sand and aggregate to make concrete.

  • Hopefully your practical work to develop skills and understanding has included the following (which should also be revised, helps in understanding 'how science works' and context examination questions):

    • investigating the limestone cycle:

      • decomposition of CaCO3 to give CaO,

      • reaction with water to give Ca(OH)2,

      • addition of more water and filtering to give limewater and use of limewater to test for CO2,

    • thermal decomposition of CaCO3 to show limelight - glowing white hot 'lime'

    • honeycomb demonstration: heat sugar syrup mixture to 150 C and add sodium bicarbonate

    • making concrete blocks in moulds, investigation of variation of content and carrying out strength tests

    • designing and carrying out an investigation of trends in the thermal decomposition of metal carbonates

    • investigation of the reaction of carbonates with acids.

  • Revision notes and quizzes

AQA GCSE Sciences - Revision Notes

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