Friday, May 2, 2008
Our Little Celery Experiment
We are working on a biology unit. Our current topic is plants and on Monday, April 28th (the day we studied stems) we started an experiment with celery and colored water. We put one stalk in red water, one in blue water, and we split one and put a part in each color. When asked what they thought would happen, the kids said, "The celery in the red water will turn red, the celery in the blue water will turn blue, and the celery in both will turn purple." I bit my tongue and let them wait to see what would happen for themselves.
This is what the celery looked like on Wednesday, April 30th. The split celery had one side with red coloring, the other side had blue coloring, and the stalk was bent. The stalk in the red water did have red coloring, but it didn't look very healthy. The stalk in the blue water had blue coloring and actually looked better than it did starting out.
It didn't take long (probably within an hour or two of starting the experiment) for the kids to realize that the split celery would not turn purple. They had several good ideas of how we could get purple celery though. Some wanted to switch the stalks to the opposite cups, some wanted to mix the blue and red water and start over with a new stalk, and some wanted to make new colored water with red and blue food coloring and use a new stalk.