for makayla decastro lab phase and gas laws

Phase changes lab:
We burn the candle

Or
http://www.nclark.net/GasLaws
see p2XXXXX nevermind



Gas laws lab:
http://artofteachingscience.blogspot.com/2012/02/gas-laws-where-it-all-began.html
I revisited a classic bar trick today too.  I put a candle in the center of a shallow water bath.  If you invert a flask over the candle, trapping the gas with the water, the candle goes out and the water level rises.  Chemistry teachers love to tell their students that this happens because the candle is using up all the oxygen in the flask, thus decreasing the pressure inside the flask causing the water to be pushed into the flask.  This explanation is partially true, because the water level does rise some as the candle is burning.  However, the temperature change once the candle goes out causes a more dramatic change in the water level.  I tested this theory by conducting the experiment with a hot flask, no candle at all.  You can see that the blue water rose into the flask just from cooling the gas inside.   I still think this makes for a fun party trick if you’re out with some friends, regardless of how you explain it.

Here are some photos of the candle trick.  You can try this one at home with a bit of play dough, a birthday candle, a bowl, and a jar.