Aim:To observe convection in a liquid
Equipment:
~200ml beaker
~water
~tweezers
~a crystal of potasium permanganate
~a drinking straw
~Bunsen burner
~heat mat
~tripod
~gauze mat
Method:
1.set up a Bunsen burner on a heatproof mat. put the gauze mat on the tripod but leave it just to one side of the Bunsen burner
2.fill 200ml beaker with 150ml cold water
3.place the beaker on top of the tripod and gauze and allow it to settle for a few minutes
4.carefully insert a drinking straw down one side of the beaker, ensuring the straw is touching the bottom of the beaker. be careful as you do not want to disturb the water to much.
5.using tweezers, drop a crystal of potassium permanganate down the inside of the straw
6.very gently.so to disturb the water remove the staw
7.light the bunsen burner ans slide it under the tripod so that you are only heating the outside of the beaker where the crystal is
observation:
the colour was purple and it was at the bottom
when it was heated it rose up to the top of the water
then the colour mixed with the water.
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