Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 436 · 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.⚖️ 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 water (b) size of the balloon (c) the amount of sugar (d) the water temperature
2. 2.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
3. 3.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it bursts at once (c) it grows much faster (d) it turns yellow
4. 4.🍞 Which of these is something yeast does not need? (a) warm water (b) salt (c) sugar (d) time
5. 5.⚖️ 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) True (b) False
6. 6.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to colour rice (c) to clean floors (d) to wash dishes
7. 7.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
8. 8.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) the balloon is bigger (c) it turns to bread (d) it shrinks to nothing
9. 9.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) turmeric powder (c) a balloon (d) a small bottle
10. 10.⚖️ 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 change it (c) we keep it the same
11. 11.🍞 Which of these is something yeast needs? (a) vinegar (b) a magnet (c) time (d) sunlight
12. 12.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it turns to sugar (c) it glows (d) the yeast is killed
13. 13.⚖️ 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
14. 14.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) turmeric powder (c) a balloon (d) a comb
15. 15.🔍 Which is the odd one out? (a) warm water (b) time (c) sugar (d) sunlight
16. 16.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
17. 17.⚖️ 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 yeast (c) the water temperature
18. 18.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a battery cell (c) a balloon (d) a small bottle
19. 19.🍞 Which of these is something yeast does not need? (a) time (b) vinegar (c) warm water (d) sugar
20. 20.🍞 Which of these is something yeast does not need? (a) sunlight (b) warm water (c) sugar (d) time
21. 21.True or false: a paper clip is not needed for the yeast balloon. (a) False (b) True
22. 22.True or false: a balloon is not needed for the yeast balloon. (a) False (b) True
23. 23.🔍 Which is the odd one out? (a) salt (b) warm water (c) time (d) sugar
24. 24.⚖️ 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 change it (b) we measure it (c) we keep it the same
25. 25.🛟 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
26. 26.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
27. 27.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is kept the same. (a) True (b) False
28. 28.True or false: warm water is something yeast needs. (a) False (b) True
29. 29.🔍 Which is the odd one out? (a) warm water (b) vinegar (c) time (d) sugar
30. 30.True or false: a small bottle is not needed for the yeast balloon. (a) False (b) True
31. 31.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) sugar (c) warm water (d) a mirror
32. 32.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the water temperature”? (a) we change it (b) we keep it the same (c) we measure it
33. 33.⚖️ 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) size of the balloon (c) the water temperature (d) the amount of yeast
34. 34.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
35. 35.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
36. 36.🍞 Which of these is something yeast needs? (a) vinegar (b) a magnet (c) sugar (d) salt
37. 37.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a paper clip (c) turmeric powder (d) warm water
38. 38.True or false: a battery cell is not needed for the yeast balloon. (a) False (b) True
39. 39.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) warm water (c) dry yeast (d) a comb
40. 40.⚖️ 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 change it (b) we measure it (c) we keep it the same

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