Pupil sheet · States and changes of state
States and changes of state — return questions
Name ______________________ Date ____________
Use one to two weeks after the lessons. Keep the notes and the lesson closed.
1. state / describe
Keep the lesson closed. For a solid, a liquid and a gas, state one property of each. Then describe the particles in each state: their separation, arrangement and motion.
2. explain / state
Keep the lesson closed. Explain why the temperature of melting ice stays at 0 °C while it is heated. Then state two differences between evaporation and boiling.
3. state
Keep the lesson closed. Name the change of state when (a) water vapour turns into liquid water and (b) liquid water turns into ice. (c) Explain why the temperature stays constant while a liquid freezes, although it keeps losing energy. (d) State how you can tell from its melting and boiling points that a substance is a gas at 25 °C.