Yeast Experiments

We have been learning what yeast eats and what happens when yeast becomes active.
We have tried lots of experiments to find out.
First we added yeast, sugar and warm water to a bowl to watch what happens when yeast wakes up. Yeast is normally dormant (which means asleep) but becomes active when it its suger or starch and has warmth.
Eden said:
It looked like calm milk.
It smelled strong.
In the end it had more bubbles and the bubbles were the size of a mushroom.

In our second experiment we were learning about the gas (Carbon Dioxide) that comes from the yeast when it eats the sugar. We put yeast, sugar and warm water in a bottle and put a balloon on top.
Alana said:
What I think will happen is the ballon will get a bit bigger.
When we shook it the balloon grew to the top.
This happened because there was so much Carbon dioxide made from the yeast eating the sugar that it filled the bottle and then started blowing the balloon up!!

Our third experiment was to test a variety of liquids to find out which one yeast likesto eat the best - and why it might like to eat it.
We added yeast to Coke, Lemon Juice, Milk, vinegar and warm water (no sugar).
Braiden thought the coke would go really really fizzy and overflow. He said once the yeast was added it looked like milo and smelt gross.
Lily thought thought the lemon juice would explode when the yeast was added. She said it smelle alright, and looked not bad (it separated).
Annaleise thought the water would turn white. She said it looked and smelt like milk.