Heating And Cooling L6

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Changes of state, Year 8, science

Changes of state, Year 8, science

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  • 1. Changes of state Target: To know about the change of state from liquid to a solid. Thursday 3 December 2009
  • 2. Experiment
    • Place a test tube containing stearic acid into hot water. The solid will melt.
    • Remove the test tube and thermometer and place it in a test tube rack.
    • Record the temperature for 15 minutes.
    • Plot a graph of your results – show temperature against time.
    Time (min) Temperature ( o C) 0 1 2 3 4 5 6 7 8 9
  • 3. A change of state is given a name. Solid Liquid Melting Freezing Changes of state
  • 4.
    • If a liquid is cooled its temperature falls to its freezing point.
    • At the freezing point the temperature stops falling while the liquid solidifies.
    • Once all the liquid has frozen the temperature of the container starts to fall again.
    Changes of state – cooling curves The freezing point of a substance is the temperature at which the liquid spontaneously turns into a solid. The freezing point depends of the pressure of the atmosphere above the liquid.
  • 5. Solid  Liquid Liquid Liquid  Gas Gas Solid Time Changes of State Temperature