Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 981 · 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.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
2. 2.⚖️ 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
3. 3.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
4. 4.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a mirror (c) sugar (d) a battery cell
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) size of the balloon (b) the amount of yeast (c) the water temperature (d) the amount of sugar
6. 6.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) it shrinks to nothing (c) the balloon is smaller (d) it turns to bread
7. 7.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it turns to sugar (c) it grows faster (d) the yeast is killed
8. 8.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) sugar (c) dry yeast (d) a magnet
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 yeast”? (a) we keep it the same (b) we measure it (c) we change it
10. 10.🧺 Which of these is not needed for the yeast balloon? (a) a battery cell (b) dry yeast (c) a small bottle (d) warm water
11. 11.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) air from outside (c) steam (d) smoke
12. 12.⚖️ 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 same bottles (b) the amount of water (c) the water temperature (d) size of the balloon
13. 13.True or false: salt is something yeast needs. (a) False (b) True
14. 14.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
15. 15.True or false: warm water is something yeast does not need. (a) True (b) False
16. 16.⚖️ 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) False (b) True
17. 17.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
18. 18.⚖️ 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 keep it the same (c) we change it
19. 19.True or false: a comb is not needed for the yeast balloon. (a) True (b) False
20. 20.🔍 Which is the odd one out? (a) a magnet (b) vinegar (c) salt (d) sugar
21. 21.True or false: a magnet is something yeast needs. (a) False (b) True
22. 22.🍞 Which of these is something yeast needs? (a) sunlight (b) salt (c) warm water (d) vinegar
23. 23.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold kills sugar (c) cold slows yeast down (d) cold water is heavy
24. 24.🍞 Which of these is something yeast needs? (a) a magnet (b) vinegar (c) salt (d) sugar
25. 25.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
26. 26.🔍 Which is the odd one out? (a) sugar (b) time (c) warm water (d) a magnet
27. 27.🍞 Which of these is something yeast does not need? (a) warm water (b) vinegar (c) time (d) sugar
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a small bottle (c) a balloon (d) a paper clip
29. 29.🍞 Which of these is something yeast does not need? (a) sugar (b) sunlight (c) warm water (d) time
30. 30.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
31. 31.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
32. 32.🔍 Which is the odd one out? (a) salt (b) warm water (c) time (d) sugar
33. 33.True or false: a balloon is not needed for the yeast balloon. (a) False (b) True
34. 34.🍞 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
35. 35.⚖️ 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 measure it (c) we change it
36. 36.🔍 Which is the odd one out? (a) warm water (b) time (c) sunlight (d) sugar
37. 37.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
38. 38.⚖️ 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 amount of water (c) size of the balloon
39. 39.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
40. 40.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) keep it for a month (c) put it in your mouth (d) pour it down the sink

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