1 Substances can undergo two kinds of change, physical and chemical. List four observations that will tell you that a substance has changed chemically.
2 Draw a table with two columns labelled physical change and chemical change. Write down each of the following changes in the correct column: water boiling; a car rusting; petrol burning; sugar dissolving in tea; food being digested; bleach cleaning a dirty cloth; beer fermenting; ice cream melting; wind blowing; milk turning sour; seawater evaporating.
3 a) Name the two products formed when candle burns. Explain how you would find out that these two products have been formed.
b) Explain why these same two products are formed when petrol, paraffin and butane gas are burned.
4 Copy and complete: Matter is something that takes up _________and has________
5 Identify two substances that sublime.
6 Identify and list the physical and chemical changes that take place during the burning
of a candle.
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