Boiling

• Boiling


  1. Draw a particle diagram of a solid, a liquid and a gas

  2. Draw arrows to represent melting and freezing

  3. Explain how you could carry out a test to determine if a solid substance was pure
• Melting


  The process of a solid substance becoming a liquid
• Freezing


  The process of a liquid substance becoming a solid
• To test if a solid substance is pure

  1. Heat it using a Bunsen burner and record the temperature every 10 seconds

  2. If it remains at one temperature for a prolonged amount of time it is a pure substance
• Boiling


  Add an arrow to your particle diagrams to show when you think boiling occurs
• As the water is boiled


  The particles gain energy
• The particles gain more energy


  The bonds between them break
• As the particles gain more energy


  The speed of the particles increases
• The particles are then free to move

  In the gas state
• Boiling point


  The temperature at which a substance boils
• State of a substance

  • Gas - if temperature is above boiling point
  • Solid - if temperature is below melting point
  • Liquid - if temperature is below boiling point, but above melting point
• Ethanol melts at -114°C and boils at 78°C
• Ethanol is in a solid state at -150°C
• Ethanol is in a liquid state at 0°C and 25°C
• Ethanol is in a gas state at 100°C
• Metals are almost always solid at room temperature