GCSE Chemistry

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Author:
ghoran
ID:
146069
Filename:
GCSE Chemistry
Updated:
2012-04-06 11:47:58
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GJH JBH
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GJH JBH
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  1. label the diagram
    • A = HEAT
    • B = CAO
    • C = CaCO3 (heat) ==> CaO + CO2

    • D = CaCO3
    • E= Ca(OH)2
    • F = CaO + (a tiny bit of ) H2O => Ca(OH)2
    • G = calcium carbonate (heat) => calcium oxide + carbon dioxide
    • H = calcium oxide + (a tiny bit of) water => calcium hydroxide
    • I = Ca(OH)2
    • J = Ca(OH)2 + (a lot of) H2O => Ca(OH)2
    • K = calcium hydroxide + water => calcium hydroxide
    • L = add carbon dioxide
    • M = Ca(OH)2+CO2 ===> CaCO3 + H2O
  2. limestone is made up of a compound called ..... ....... which has the chemical formula ....... . Chalk and marble are other forms of calcium carbonate . All these forms of calcium carbonate were made from the shells of sea creatures that died millions of years ago . the shells were ..... and heated underground to form rock . The different forms have been squashed and heated gto different amounts , which makes thier physical properties slightly different , but chemically they still ....... the same
    • calium carbonate
    • CaCO3
    • Compacted
    • react
  3. calcium carbonate decomposes when ....... to form calcium oxide and carbon dioxide . This type of chemical reaction is called ...... decomposition . The word equation for the thermal decomposition of calcium carbonate is --------------------------------------------------------
    the balanced symbol equation is ----------------------------------------------
    many other metal carbonates thermall decompose
    • heated
    • thermally
    • calcium carbonate (heat) ====> calcium oxide + carbon dioxide
    • CaCO3(heat) =====> CaO + CO2
  4. Calcium oxide reacts vigorously with .... to form calcium hydroxide . This reaction gives out a lot of heat energy , so it is an ...... reaction . the word equation is ----------------------------------------------- the balanced symbol equation is ------------------------------------------------
    • water
    • exothermic
    • calcium oxide + water => calcium hydroxide
    • CaO + H2O ===> Ca(OH)2
  5. If more water is added to calcium hydroxide a solution of calcium hydroxide is made . the solution is commonly known as ....... . Limewater is used a a test for carbon dioxide as it goes cloudy when carbon dioxide gas is bubbled through it . The limewater goes cloudy because carbon dioxide reacts calcium hydroxide to make calcium carbonate ( which is ..... in water and it is this that makes the water .....) . water is also made in th reaction . The word equation for the reaction is .............................................................
    the balanced symbol equation is ...................................................................................
    • limewater
    • insoluble
    • cloudy
    • calcium hydroxide + carbon dioxide ==> calcium carbonate + water
    • Ca(OH)2 + CO2 ====> CaCO3 + H2O

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