Tuesday, June 2, 2009

our pantry science experiments!

We have been doing some simple science experiments lately. We tested alkaline and acids using purple cabbage water, bi-carb soda, and vinegar. It's like litmus paper, but more fun!

How to do it!

Boil some purple cabbage in a saucepan. Strain the water into a clear jar.

Add some bi-carb soda. This is an alkaline - or base, neutral - substance so it causes the purple water to change to pink.

Add some vinegar (make sure the container is over a bowl because the reaction of the bi-carb and vinegar can get exciting) and the water will change to blue! That's because vinegar is an acid!

We also made a compass using basic household equipment!

All you need is a round cork - the sort found in the top of jars, not bottles - a magnet, some sticky tape, and a needle, a bowl large enough to fit the cork in, and water.

What to do .....

Stroke the magnet in one direction down the needle for three to five minutes.

Use a small bit of sticky tape to stick it to the top of the cork.

Place the cork in the bowl of water and watch the needle spin until the end faces due north!

This shows the properties of magnetism and how they interact with the earth. it's pretty amazing if I do say so myself.


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