Yeast Balloon Inflation
Balloon slowly inflates.
Teaching & key ideas
What you do: Show fresh setup and a prepared older one.
What students see: Balloon slowly inflates.
Why it works: Yeast metabolizes sugar and releases carbon dioxide.
Question to ask: Is the yeast alive? What clue do we see?
Lesson flow
Predict → demonstrate → observe → briefly explain → ask: Is the yeast alive? What clue do we see?