Experiment 5: Lava Lamp!

The Experiment

The Results

Cloudy water.  Then after a re-jig, slightly less cloudy water.  This did not go well.  But that's all part of science too.  We learn from our failures as well as our successes.

The Science

Apparently what's supposed to happen is the salt falls through the oil, takes a bit of food colouring and oil with it and then dissolves in the water, releasing the oil to float back to the surface and leaving a puff of colour.  

Experiment 4: Elephant Toothpaste!

The Experiment

The Results

A nice gush of pink foam.

How To Make Elephant Toothpaste

1. Put on your science goggles, science gloves and science coat.  Hydrogen Peroxide is a bleaching agent, so cover up!
2. Mix 100 ml of Hydrogen Peroxide 6%, a tablespoon of washing-up liquid and some food colouring into a bottle.
3. Mix 1 tablespoon of Dry Yeast and 3 tablespoons of warm water in a jug and allow to stand for 30 seconds or so.
4. Remove any lumpy bits from the yeast solution.
5. Pour the remaining yeasty liquid into the bottle.
6. Enjoy!

The Science

The yeast acts as a catalyst breaking down the Hydrogen Peroxide and releasing the Oxygen.  The washing-up liquid in the water traps the Oxygen creating bubbles.

Experiment 3: Teabag Rockets!

The Experiment

The Results

This one didn't quite go according to plan.  Further viewing on the Interweb has shown that everyone else seems to do it inside.  Maybe the draft or the cold weather affected it.

The Science

The principle is similar to a hot air balloon.  The burning top of the cylinder of paper heats the air, which rises up allowing the denser, cooler air to push in from the bottom.  This convection current allows the lightweight ashy residue of the bag to fly into the air.