Yeast Balloon Experiment Worksheet

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

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