EQUIPMENT petri dish,water,tweers,a crystal of pot assium permangnate.
METHOD
1. half fill your petri dish with cold tap water
2. place the petri dish on your work bench and allow water to become settled.
3. using th twezerts place a singel crystal of potassium permanganate in the centre of the petri dish.
4. observe for 5 minutes
5. REPEAT the experiment using hot water.
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