Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 354 · 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 needed for the yeast balloon? (a) a paper clip (b) a mirror (c) turmeric powder (d) dry yeast
2. 2.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
3. 3.🔍 Which is the odd one out? (a) sugar (b) warm water (c) time (d) salt
4. 4.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is kept the same. (a) True (b) False
5. 5.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) a balloon (c) sugar (d) a small bottle
6. 6.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
7. 7.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) sugar (d) sunlight
8. 8.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
9. 9.🔍 Which is the odd one out? (a) sugar (b) warm water (c) vinegar (d) time
10. 10.True or false: a magnet is needed for the yeast balloon. (a) False (b) True
11. 11.True or false: vinegar is something yeast needs. (a) False (b) True
12. 12.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a paper clip (c) warm water (d) a small bottle
13. 13.True or false: a mirror is not needed for the yeast balloon. (a) False (b) True
14. 14.🍞 Which of these is something yeast needs? (a) salt (b) vinegar (c) sunlight (d) time
15. 15.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a magnet (c) a small bottle (d) sugar
16. 16.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) put it in your mouth (c) pour it down the sink (d) throw it at a wall
17. 17.⚖️ 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
18. 18.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
19. 19.🔍 Which is the odd one out? (a) sugar (b) sunlight (c) a magnet (d) vinegar
20. 20.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) it turns to bread (c) it shrinks to nothing (d) the balloon is smaller
21. 21.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
22. 22.True or false: a comb is not needed for the yeast balloon. (a) True (b) False
23. 23.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it glows (c) it turns to sugar (d) the yeast is killed
24. 24.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
25. 25.⚖️ 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 change it (b) we keep it the same (c) we measure it
26. 26.True or false: sunlight is something yeast needs. (a) True (b) False
27. 27.🔍 Which is the odd one out? (a) sunlight (b) salt (c) time (d) a magnet
28. 28.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
29. 29.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold slows yeast down (c) cold makes it pink (d) cold kills sugar
30. 30.📘 What is yeast? (a) a kind of sugar (b) a kind of salt (c) a tiny living fungus (d) a kind of stone
31. 31.True or false: dry yeast is needed for the yeast balloon. (a) False (b) True
32. 32.🔍 Which is the odd one out? (a) warm water (b) sugar (c) time (d) a magnet
33. 33.True or false: a battery cell is not needed for the yeast balloon. (a) False (b) True
34. 34.True or false: a magnet is not needed for the yeast balloon. (a) False (b) True
35. 35.True or false: sugar is something yeast does not need. (a) True (b) False
36. 36.⚖️ 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
37. 37.🍞 Which of these is something yeast needs? (a) salt (b) a magnet (c) sugar (d) sunlight
38. 38.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
39. 39.True or false: warm water is needed for the yeast balloon. (a) True (b) False
40. 40.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed

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