Describe the states of matter and changes of state on a heating curve for water, and list a safety precaution for using a thermometer.

Here are the answers based on the heating curve of water:

a) Write the states of matter at:

• A: Solid (ice)
• B: Solid and Liquid (melting)
• C: Liquid (water)
• F: Gas (steam)

b) What precaution should take when using a thermometer?

• Ensure the thermometer bulb is fully immersed in the substance being measured, but not touching the bottom or sides of the container.

c) What is process/change of state occurring at:

• B: Melting (or Fusion)
• D and E: Assuming "E" refers to the process at point D on the graph, the process occurring at D is Boiling (or Vaporization).