Year 5 have continued to explore chemical changes in science. This time we looked at yeast. Why do we use yeast when we make bread? The girls learnt that yeast is an organism which feeds off sugar and releases carbon dioxide gas, just as we do when we breathe out. This gas gets trapped in the dough and makes it rise. We also learnt that yeast gives the bread a light, fluffy texture and it gives us the delicious baked smell.

Here are some images of our lesson in the dining room with Sarah, who taught us how to mix and knead dough. She proved it for us and then baked it for our lunch.

Next time you break open a crusty roll, just remember that it was the yeast that made the delicious bread rise. Thank you very much to Sarah for letting us use the dining room. It was immense fun. Mrs Kelly