Science with yeast

Last week, when we made bread, we were intrigued by how the yeast made the bread rise. So, we thought we'd look at this for our language experience this week. 

Today, we were learning about how scientists follow instructions when they do experiments. We also learnt about scientific equipment (test tubes, pipets and measurements).  

Tomorrow we're going to write what we did in sequence. 

First we set out our equipment and created labels so we knew what we put in each test tube. Then we put yeast, sugar and warm water in the first test tube. 

We put yeast, baking soda and warm water in the second test tube. 

We then put yeast, vinegar and warm water in the third test tube. 

We then wrote up what we saw happening. 

Can you see that the one with the sugar has risen?

We wrote adjectives to describe what we saw and smelt. 

We found out that yeast likes to eat sugar and the liquid in this test tube frothed and grew. 

To confirm what was happening we did a second experiment. We used three sprite bottles and mixed yeast with the three different ingredients. We placed a balloon on the top of each bottle. 

We then waited.... And waited... And watched (while doing our handwriting). 

We noticed the bottle with the yeast, sugar and water in it frothed. And then.... The balloon began to inflate. 

We learnt that this was carbon dioxide. It is a sign that the yeast is eating the sugar. 

Room 3 is going to write about all this tomorrow. 

We LOVE science!!!