Hey everyone,
For the past two weeks, Room 3 has been doing science with yeast. It's an easy and very engaging series of investigations that can be adapted to every level.
You can see our photos on the Room 3 blog: www.room3sjb.blogspot.co.nz.
We first made bread and look at how it rose. This triggered questions about how the bread doubled in size.
The second week we investigated yeast.
Our Question: what does yeast like to grow?
WALT: investigate in a sequence.
What we did:
I grouped the students. Each group had three test tubes on the stand. I got them to create labels for the investigation first. We discussed the importance of making sure that they know what is going in each test tube.
Using the little plastic containers, I put yeast x 3, sugar x 1, baking soda x 1, vinegar x 1 and warm water x 3 for each group. We put the yeast, sugar and warm water into the first test tube. We put yeast, baking soda and warm water in the second. We put yeast, vinegar and warm water in the third. We placed the labels in front of each. Then we watched closely.
We wrote about what we saw. Then we followed it up with a video to explain the yeast.
I took photos on the iPad the whole time and uploaded these up to our blog with a quick explanation about what we did.
The students then wrote about it. The writing WALT was all about sequence too (using order language).
The students noticed that the yeast ate the sugar. I filled in the knowledge that the yeast produces carbon dioxide.
We also did a class exploration. I put the same ingredients into sprite bottles and then pulled a non-inflated balloon over the lid of each bottle. We watched this over the day and noticed that the bottle with yeast and sugar in it produced carbon dioxide which was captured in the balloon.
The third investigation we did was to find out what type of sugar yeast liked the best. This time we placed yeast and warm water in small zip-lock bags. In each we put: sugar, a slice of banana, a slice of apple, a few raisins, and flour. We watched this over the day.
The kids decided that the yeast most liked the sugar, but the next best was the banana.
Here are the resources I used for this series of investigations.
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