8. What term is used to describe the temperatures at which the following changes of state take place?
a. Liquid to gas b. Solid to liquid c. Liquid to solid
9. Name the state of matter that results when a: a. solid melts b. liquid evaporates c. gas condenses d. solid sublimes e. liquid freezes
10. Copy the table below and list the state of each substance at room temperature (20 °C) to complete it:
Substance Methane
Acetone
Germanium Sodium Nitrogen
Melting point (°C) Boiling point (°C) −182
−161
Iron 1538 2862 Silver
962 −95 938 98
−210
2162 56
2833 882
−195
State at room temperature (°C)
Past paper questions 1. Final Examination 2019, Question 8
When solid ice changes state to become liquid water, this is called melting. What name is given to the change of state when liquid water becomes solid ice?
2. Sample Paper 2018, Question 6 In the diagrams below, circles of different colours are used to represent atoms of different elements.