Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 520 · 40 questions

What you do (Yeast is alive): 1. Pour warm (not hot) water into the bottle — an adult checks it. 2. Add the yeast and the sugar and swirl gently. 3. Stretch the balloon over the bottle’s mouth. 4. Wait 30 minutes, measure the balloon, then pour the mixture away and wash up.

1. 1.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) a balloon (c) a small bottle (d) sugar
2. 2.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a small bottle (c) a mirror (d) dry yeast
3. 3.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of yeast”? (a) we change it (b) we keep it the same (c) we measure it
4. 4.🔍 Which is the odd one out? (a) a magnet (b) sugar (c) sunlight (d) vinegar
5. 5.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is kept the same. (a) True (b) False
6. 6.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
7. 7.🍞 Which of these is something yeast needs? (a) a magnet (b) vinegar (c) sunlight (d) sugar
8. 8.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) very salty (d) warm, not hot
9. 9.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
10. 10.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
11. 11.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
12. 12.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) it turns to bread (c) the balloon is bigger (d) it shrinks to nothing
13. 13.🔍 Which is the odd one out? (a) sugar (b) warm water (c) time (d) vinegar
14. 14.🔍 Which is the odd one out? (a) time (b) warm water (c) a magnet (d) sugar
15. 15.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is the one thing we change. (a) False (b) True
16. 16.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the same bottles (b) the amount of sugar (c) the amount of yeast (d) size of the balloon
17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a magnet (c) sugar (d) a balloon
18. 18.📘 What is yeast? (a) a kind of salt (b) a tiny living fungus (c) a kind of sugar (d) a kind of stone
19. 19.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a balloon (c) warm water (d) a mirror
20. 20.🍞 Which of these is something yeast needs? (a) salt (b) a magnet (c) warm water (d) vinegar
21. 21.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) sugar (c) a paper clip (d) turmeric powder
22. 22.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
23. 23.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
24. 24.🧺 Which of these is not needed for the yeast balloon? (a) a comb (b) warm water (c) a small bottle (d) dry yeast
25. 25.True or false: a small bottle is not needed for the yeast balloon. (a) False (b) True
26. 26.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) put it in your mouth (c) throw it at a wall (d) pour it down the sink
27. 27.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) turmeric powder (c) dry yeast (d) warm water
28. 28.True or false: vinegar is something yeast does not need. (a) True (b) False
29. 29.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of water”? (a) we keep it the same (b) we measure it (c) we change it
30. 30.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
31. 31.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a small bottle (c) a battery cell (d) warm water
32. 32.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is what we measure. (a) True (b) False
33. 33.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a magnet (c) warm water (d) a mirror
34. 34.🍞 Which of these is something yeast needs? (a) sunlight (b) a magnet (c) time (d) vinegar
35. 35.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a paper clip (c) sugar (d) a balloon
36. 36.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is the one thing we change? (a) the amount of sugar (b) the water temperature (c) the amount of water (d) the amount of yeast
37. 37.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “size of the balloon”? (a) we keep it the same (b) we change it (c) we measure it
38. 38.True or false: sugar is something yeast needs. (a) False (b) True
39. 39.True or false: a comb is not needed for the yeast balloon. (a) False (b) True
40. 40.True or false: warm water is something yeast needs. (a) False (b) True

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