Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 46 · 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 battery cell (b) a magnet (c) sugar (d) a comb
2. 2.⚖️ 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 water temperature (b) the amount of sugar (c) the same bottles (d) size of the balloon
3. 3.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) sugar (c) a battery cell (d) a balloon
4. 4.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is kept the same. (a) False (b) True
5. 5.True or false: a small bottle is not needed for the yeast balloon. (a) False (b) True
6. 6.True or false: salt is something yeast does not need. (a) False (b) True
7. 7.🔮 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
8. 8.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
9. 9.🔍 Which is the odd one out? (a) salt (b) sunlight (c) vinegar (d) time
10. 10.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
11. 11.⚖️ 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 measure it (c) we keep it the same
12. 12.True or false: a paper clip is not needed for the yeast balloon. (a) False (b) True
13. 13.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is kept the same. (a) False (b) True
14. 14.True or false: sugar is needed for the yeast balloon. (a) True (b) False
15. 15.True or false: sugar is something yeast needs. (a) True (b) False
16. 16.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
17. 17.True or false: warm water is needed for the yeast balloon. (a) True (b) False
18. 18.True or false: warm water is something yeast does not need. (a) False (b) True
19. 19.🔮 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
20. 20.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
21. 21.🍞 Which of these is something yeast needs? (a) sunlight (b) sugar (c) a magnet (d) salt
22. 22.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
23. 23.⚖️ 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
24. 24.True or false: a comb is not needed for the yeast balloon. (a) False (b) True
25. 25.⚖️ 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) False (b) True
26. 26.🔍 Which is the odd one out? (a) vinegar (b) warm water (c) a magnet (d) salt
27. 27.🍞 Which of these is something yeast needs? (a) salt (b) a magnet (c) time (d) vinegar
28. 28.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it heavy (c) to make it sweet (d) it is food for yeast
29. 29.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
30. 30.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
31. 31.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) sugar (c) a comb (d) warm water
32. 32.🔮 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
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 water”? (a) we keep it the same (b) we change it (c) we measure it
34. 34.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) a battery cell (c) turmeric powder (d) a comb
35. 35.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) sugar (c) a magnet (d) a small bottle
36. 36.🍞 Which of these is something yeast needs? (a) sunlight (b) salt (c) warm water (d) a magnet
37. 37.⚖️ 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
38. 38.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is kept the same. (a) True (b) False
39. 39.🛟 The water for the yeast should be ___. (a) ice cold (b) warm, not hot (c) boiling hot (d) very salty
40. 40.🛟 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

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