t about 200 ml of water (a mug full)
t an ice cube tray (and freezer)
t a small saucepan with lid (and a stove).
What to do: Place half the water in an ice cube tray (you want about two ice cubes) and place the tray in the freezer. Allow it to freeze overnight. The next day take out the ice cube tray and note the appearance of the ice.
Place the ice cubes on a saucer and allow the cubes to warm up again. Note the changes that occur. (This will take a while, around an hour, so just check the ice cubes every ten minutes or so until no further changes are seen.)
Question 3: Has the water been changed by these processes? Explain your answer.
While the ice cubes are melting place about 100 ml of water in a saucepan and heat it until it starts to boil. Turn the heat down so that it continues to boil gently. Observe the boiling process and record your observations.
Place a lid over the saucepan for a minute. Take the lid off again. What is on the lid? Once again note your observations.
Question 4: In your opinion, what has happened?