For a school chemistry design lab I tried to find the optimal sugar concentration for fastest yeast fermentation. I put the same amount of yeast and sugar water solutions with different concentrations of sugar together and measured the carbon dioxide produced using a water displacement apparatus. My teacher approved the topic, which is why I went along with it, but our teachers are often too lenient with approving topics, and this will be moderated so I can't just squeak through.
My main problem is that I feel it is too biology-oriented. There is very little chemistry in it. What can I do (preferably with yeast because I still have quite a bit and it wouldn't seem like a complete change of topic to my teacher)