Thursday, September 30, 2010

The Three Phases of Matter -- posted by John, George, and Richard

We did some science experiments to show the different phases of matter (solid, liquid, gas), by using different materials to create each phase.

First, we put seltzer water in a jar and dropped raisins in it. The raisins were heavy and went to the bottom of the jar, but the gas bubbles from the seltzer water attached to the bottom of the raisins and lifted them to the top of the water. Once the gas bubbles popped and dispersed into the air, the raisins sank to the bottom again. Then they collected gas bubbles and did it all over again. They continued to go up and down and up and down even while we were doing the other experiments.







The next experiment we did was to add vinegar to a bottle with baking soda in it. When the liquid vinegar and the solid baking soda are combined, they make carbon dioxide. When we quickly put the balloon on the bottle, it captured the air that had been displaced by the carbon dioxide. Carbon dioxide is heavier than air.





In the next experiment we put a fizz tablet in a jar of water. The fizz tablet contains citric acid and baking soda. The water causes the citric acid and the baking soda to combine and it makes a gas. We watched the gas bubbles float to the top of the water and escape into the air.



After mixing liquids and solids to make gas, we then mixed solid and liquids to make something really fun. So much fun that we were joined by the older boys: Will, Spencer, and James. And they loved it!

This was the most exciting experiment by far, even though it was simple. All you do is add 1 tablespoon of water to 2 tablespoons of cornstarch. It makes a substance that behaves like both a liquid and a solid!







We poured it in our hands as a liquid, and then when we squeezed it, it became a solid. If we just held the solid in our hands, it turned back into a liquid! We all played with it for a long time.









In the last experiment we combined two liquids and a solid to make slime. We combined Borax, water, and glue, plus three drops of food coloring. At first, it was liquid-y and could be played with like slime. Then, when it was poured into James's hand, and he kneaded it and squeezed it for about 5 minutes, it became a solid and he rolled it into a ball! It was a very bouncy ball! Mom said when it quits raining, she'll let us make more slime and balls, but that should be an outside project.



Photobucket

Photobucket

Photobucket

Photobucket

This is the bouncy ball with its little buddy:

Photobucket

This is Little Buddy's little buddy:

Photobucket

Photobucket

No comments: