Earlier this week I made some soup for supper. The girls wanted to put an ice cube in their bowl to help the soup cool faster. Of course this led to some fun. The girls did a little "experiment" to see what salt and pepper would do to an ice cube.
They left one cube clean, added salt to the cube on the right, and pepper to the cube on the left. It was pretty amazing to see how fast the salt made a hole in the ice cube. The pepper didn't make that much of a difference. We thought, if it did increase the melting speed it would probably be due to the color, since darker colors absorb more light/heat. The same reason dirty snow melts quicker than clean snow.
We learned that salt water has a lower freezing point than fresh water. Adding the salt lowered the freezing point, which melted the ice cube faster than the ice cube without the salt.
The girls also had fun playing with different states of water here: http://www.bbc.co.uk/schools/ks2bitesize/science/activities/changing_state.shtml
It's a British site, so it uses Celsius instead of Fahrenheit.
This one was fun, too: http://www.bbc.co.uk/schools/ks2bitesize/science/activities/gases.shtml
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