Science 9 – This is a result from one group’s experiment with yeast budding. Their experimental variable was water pH, and it looks like they may have made a mistake. This turns out to be excellent for everyone because it will give the class a chance to apply reasoning to an experimental results.
E: pH 3
F: pH 5
G: pH 7
H: pH 11
If maximum gas was at pH 7, then clearly the pH 3 solution should have less gas than the pH 5. It’s hard to tell from the picture but balloon E was the 2nd fullest. A few students were able to apply CER (Claim, Evidence, Reasoning) to find this mistake.