Home   Fourth/Fifth Grade   Ms. Zapata’s 4/5 Class, 4/12/13

Ms. Zapata’s 4/5 Class, 4/12/13

Above: Showing a celery strand with the red dye.

Today’s reporters are Lena and Taliyah.

Yesterday we went to Excelsior Science Workshop and played with fire. We paired up to work together. We put hydrogen peroxide and yeast together and also baking soda and vinegar together. We lit a candle and then put a stick into the fire.

First we did an experiment where we breathed out into a jar to capture our carbon dioxide. We put the jar over the candle and the candle went out immediately. It wasn’t immediately for some people. This is because the jar didn’t have enough oxygen and fire needs oxygen to burn.

Next was the baking soda and vinegar. After the stick was lit, we poured the vinegar on the baking soda. We put the stick near the bubbles and the fire went out immediately.

The third experiment was hydrogen peroxide and yeast. We blew the stick out until the end was orange. It wasn’t on fire anymore but still smoldering. We kept blowing on it so that it stayed lit but didn’t have a flame. The other partner poured the hydrogen peroxide onto the yeast. Then the partner with the stick put the stick near the mixture and the stick lit up into flames again. This is because the hydrogen peroxide and yeast made a chemical reaction and released some gas, and the gas was lit by the fire on the stick.

After the three experiments we had free play. There was a real human lung to look at. It was brown pinkish. It was mushy and soft. There was a silver ball (a Van de Graaf generator) and when people put their hands on the ball, their hair stuck up like they had been electrocuted. Like a troll doll. photo

Earlier in the week we did an experiment with celery. We put red dye powder in water and poured it into a test tube. Then we put celery in the test tube and left it overnight.

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When we came back the next day, the celery was partly red. The xylem and phloem are transports in the celery. The xylem transports water and minerals into the cells of the plant. The celery turned red because the xylem transported the red dye into other parts of the celery.

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Rm305

Ms. Zapata's 4th & 5th grade class

 

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