Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 600 · 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? True or false: the same bottles is the one thing we change. (a) False (b) True
2. 2.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to colour it (c) to make it heavy (d) it is food for yeast
3. 3.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the water temperature (b) size of the balloon (c) the amount of yeast
4. 4.True or false: a paper clip is needed for the yeast balloon. (a) False (b) True
5. 5.⚖️ 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 keep it the same (c) we change it
6. 6.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) it turns to bread (c) it shrinks to nothing (d) the balloon is bigger
7. 7.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
8. 8.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
9. 9.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
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 yeast”? (a) we keep it the same (b) we measure it (c) we change it
11. 11.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
12. 12.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) smoke (c) steam (d) carbon dioxide gas
13. 13.🔍 Which is the odd one out? (a) vinegar (b) warm water (c) time (d) sugar
14. 14.🍞 Which of these is something yeast needs? (a) sugar (b) a magnet (c) vinegar (d) salt
15. 15.True or false: a mirror is not needed for the yeast balloon. (a) False (b) True
16. 16.True or false: time is something yeast does not need. (a) True (b) False
17. 17.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
18. 18.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to colour rice (c) to wash dishes (d) to make bread rise
19. 19.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
20. 20.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a mirror (c) a battery cell (d) warm water
21. 21.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a magnet (c) a battery cell (d) a balloon
22. 22.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
23. 23.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) sugar (c) a small bottle (d) a magnet
24. 24.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it grows much faster (c) it turns yellow (d) it bursts at once
25. 25.🔍 Which is the odd one out? (a) warm water (b) salt (c) vinegar (d) sunlight
26. 26.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the water temperature (b) the same bottles (c) size of the balloon
27. 27.🔍 Which is the odd one out? (a) salt (b) vinegar (c) sunlight (d) sugar
28. 28.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it grows faster (c) the yeast is killed (d) it glows
29. 29.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
30. 30.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) time (d) salt
31. 31.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
32. 32.⚖️ 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 yeast (b) the water temperature (c) the amount of water (d) size of the balloon
33. 33.⚖️ 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 keep it the same (b) we measure it (c) we change it
34. 34.🔍 Which is the odd one out? (a) time (b) salt (c) warm water (d) sugar
35. 35.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) sunlight (d) time
36. 36.True or false: sugar is something yeast needs. (a) False (b) True
37. 37.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is the one thing we change. (a) True (b) False
38. 38.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) dry yeast (c) warm water (d) a paper clip
39. 39.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) sugar (c) a balloon (d) a battery cell
40. 40.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed

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