Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 801 · 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.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) warm water (d) vinegar
2. 2.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
3. 3.True or false: sunlight is something yeast does not need. (a) False (b) True
4. 4.⚖️ 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 measure it (b) we keep it the same (c) we change it
5. 5.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the amount of yeast (b) the same bottles (c) the amount of water (d) size of the balloon
6. 6.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a paper clip (c) sugar (d) warm water
7. 7.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
8. 8.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
9. 9.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
10. 10.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is the one thing we change. (a) True (b) False
11. 11.🔍 Which is the odd one out? (a) time (b) salt (c) a magnet (d) vinegar
12. 12.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows very little (c) it turns yellow (d) it grows much faster
13. 13.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold water is heavy (c) cold makes it pink (d) cold kills sugar
14. 14.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to clean floors (c) to wash dishes (d) to colour rice
15. 15.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it grows faster (c) it turns to sugar (d) the yeast is killed
16. 16.True or false: a paper clip 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? True or false: the amount of sugar is the one thing we change. (a) True (b) False
18. 18.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) pour it down the sink (c) put it in your mouth (d) throw it at a wall
19. 19.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
20. 20.🍞 Which of these is something yeast needs? (a) warm water (b) a magnet (c) vinegar (d) salt
21. 21.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
22. 22.True or false: a small bottle is not needed for the yeast balloon. (a) False (b) True
23. 23.🍞 Which of these is something yeast does not need? (a) sunlight (b) warm water (c) time (d) sugar
24. 24.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
25. 25.⚖️ 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
26. 26.True or false: sugar is something yeast needs. (a) True (b) False
27. 27.True or false: time is something yeast does not need. (a) True (b) False
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a mirror (c) warm water (d) a balloon
29. 29.⚖️ 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
30. 30.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) a battery cell (d) warm water
31. 31.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
32. 32.True or false: a paper clip is needed for the yeast balloon. (a) False (b) True
33. 33.⚖️ 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 keep it the same (b) we change it (c) we measure it
34. 34.True or false: time is something yeast needs. (a) False (b) True
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? What do we do with “size of the balloon”? (a) we measure it (b) we change it (c) we keep it the same
37. 37.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) turmeric powder (c) sugar (d) a balloon
38. 38.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
39. 39.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) dry yeast (c) a paper clip (d) a balloon
40. 40.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a battery cell (c) sugar (d) a comb

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