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Friday, September 18, 2009

Trouble with Science Experiments

Hi! Hi! Hi!  Guess what.  I've done some science experiments.  Unfortunately, some of them got a bit out of control.  One of them I did yesterday.  That was the one where I made homemade bubble bath.  I used some unscented liquid soap, a teaspoon of water, and 15 drops of scented oil.  Since I didn't have any scented oils, I used rose water.  It worked pretty well, but it didn't make very much.  In fact, I used it all up in one bath.  Of course, I had at least a foot of bubbles in that bath.

Another one I did is floating a paperclip on some water.  We put a paperclip on a piece of paper and carefully got the paper wet so it sank the paper clip floated on its own. In the end, the paper clip floated because of the water's surface tension.  It sunk once we added a drop of soap because the soap got between the water molecules and caused the surface tension to collapse.  It was pretty fun, but it only worked once.

The last one we did was a classic.  We took plastic glove filled with baking soda put over a cup that had some vinegar in it.  But you see, out of curiosity I decided to stop holding down the glove.  The glove had been holding the reaction in.  Instead of flying away, the glove just moved part way out of the way and the contents of the cup came up out of it.  The reason the vinegar and baking soda worked is that vinegar is acidic and baking soda is a base.  It was fun except for when we were cleaning up and I got vinegar in a cut on my hand.

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