Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 433 · 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.True or false: salt is something yeast does not need. (a) False (b) True
2. 2.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
3. 3.True or false: sugar is needed for the yeast balloon. (a) True (b) False
4. 4.🍞 Which of these is something yeast needs? (a) salt (b) sunlight (c) sugar (d) vinegar
5. 5.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
6. 6.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is smaller (c) it shrinks to nothing (d) the balloon is bigger
7. 7.⚖️ 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 measure it (b) we keep it the same (c) we change it
8. 8.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
9. 9.⚖️ 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 same bottles (b) the amount of water (c) the water temperature (d) the amount of yeast
10. 10.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) a magnet (d) time
11. 11.🍞 Which of these is something yeast does not need? (a) sunlight (b) sugar (c) time (d) warm water
12. 12.⚖️ 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 measure it (b) we keep it the same (c) we change it
13. 13.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
14. 14.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) warm water (c) a mirror (d) a battery cell
15. 15.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) throw it at a wall (c) put it in your mouth (d) pour it down the sink
16. 16.True or false: a comb is needed for the yeast balloon. (a) True (b) False
17. 17.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) steam (c) air from outside (d) smoke
18. 18.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a magnet (c) a paper clip (d) a balloon
19. 19.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
20. 20.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
21. 21.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) warm water (c) a balloon (d) a comb
22. 22.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
23. 23.🔍 Which is the odd one out? (a) sunlight (b) a magnet (c) vinegar (d) time
24. 24.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) size of the balloon (b) the amount of sugar (c) the water temperature
25. 25.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is the one thing we change. (a) False (b) True
26. 26.True or false: a magnet is something yeast needs. (a) True (b) False
27. 27.True or false: a paper clip is needed for the yeast balloon. (a) True (b) False
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) warm water (c) a balloon (d) a small bottle
29. 29.🍞 Which of these is something yeast needs? (a) warm water (b) salt (c) sunlight (d) a magnet
30. 30.🍞 Which of these is something yeast needs? (a) sunlight (b) vinegar (c) time (d) a magnet
31. 31.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
32. 32.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it grows very little (c) it turns yellow (d) it bursts at once
33. 33.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) dry yeast (c) sugar (d) warm water
34. 34.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the same bottles”? (a) we keep it the same (b) we change it (c) we measure it
35. 35.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
36. 36.⚖️ 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
37. 37.🔍 Which is the odd one out? (a) sugar (b) warm water (c) time (d) salt
38. 38.True or false: sugar is something yeast needs. (a) True (b) False
39. 39.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of sugar”? (a) we measure it (b) we change it (c) we keep it the same
40. 40.True or false: turmeric powder is needed for the yeast balloon. (a) True (b) False

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