You will need:
t 50 ml (one half a small tea cup) of water
t 1 teaspoon salt
t a small saucepan with lid (and a stove)
t a glass jar to mix the chemicals.
What to do:
Place a teaspoon of salt and the water into the jar and stir vigorously. What happens to the salt? Make sure all the salt has dissolved. Now pour the salt and water into a saucepan and heat gently. What happens to the water? What happens to the salt? (You will have to boil the mix for a while before you can answer this question.)
Stop heating before your saucepan dries out completely.
Question 6: Was the salt changed by the dissolving process? Explain.
Question 7: If you did the same experiment with sugar would the same things happen? (NOTE: If you try this, be prepared for a long cleaning job afterwards; not recommended.)
Question 8: If you kept on heating sugar what do you think would happen?
Question 9: Would sugar still be the same chemically after continued heating? Explain.