The first lab, we used Yeast and Peroxide. We found that the more yeast we used in the experiment, the larger the reaction. This is because the more enzymes (yeast) the more there were to change, so it created a larger reaction.
In the second lab we worked on, we used temperature differences. The warm mixture worked the best because it wasn't too hot, which hinders the expansion of enzymes, like a fever, and goes slower.
The last lab, the pH test, we found that the pH 2 worked the best because it wasn't harsh.