Thermal Decomposition

    Cards (20)

    • Reactants
      Should be on the left side of a word equation
    • Thermal decomposition
      A decomposition reaction that requires heating to occur
    • Decomposition reaction
      A substance is broken down into more than 1 product
    • Thermal decomposition reaction

      • Requires heating to occur
    • Thermal decomposition of metal carbonates
      Metal carbonate --> Metal oxide + Carbon dioxide
    • Thermal decomposition of metal carbonates
      • Calcium carbonate --> Calcium oxide + Carbon dioxide
      • Lead carbonate --> Lead oxide + Carbon dioxide
      • Copper carbonate --> Copper oxide + Carbon dioxide
      • Zinc carbonate --> Zinc oxide + Carbon dioxide
    • Testing for carbon dioxide
      Bubble carbon dioxide into limewater, it gets cloudy
    • In a decomposition reaction, a substance breaks down to make simpler compounds and elements. Copper carbonate decomposes to make copper oxide and carbon dioxide gas. You can use limewater to test for the gas.
    • Demonstration: Thermal decomposition reactions
    • Metal is a type of variable
    • A graph should be used to display the results
    • Independent variable
      The variable that is changed or manipulated in an investigation
    • The independent variable in this investigation was the metal
    • Dependent variable
      The variable that is measured or observed in an investigation
    • The dependent variable in this investigation was the time for the limewater to turn cloudy
    • Control variables are needed to ensure the results are not affected by other factors
    • An example of a control variable in this investigation was the amount of limewater used
    • Decomposition of a metal carbonate is a chemical reaction, not a physical change, because the composition of the substances changes
    • The metal carbonate that decomposed the easiest was the one that took the least time for the limewater to turn cloudy, indicating the fastest production of carbon dioxide
    • Thermal decomposition is the process by which a substance breaks down into simpler substances when heated.
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