Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 757 · 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.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a balloon (c) dry yeast (d) a magnet
2. 2.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) put it in your mouth (c) keep it for a month (d) throw it at a wall
3. 3.⚖️ 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 amount of water (c) the water temperature (d) the same bottles
4. 4.True or false: sunlight is something yeast does not need. (a) True (b) False
5. 5.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
6. 6.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) sugar (c) a paper clip (d) a small bottle
7. 7.⚖️ 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
8. 8.🔮 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
9. 9.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the same bottles (b) the amount of yeast (c) the amount of sugar (d) size of the balloon
10. 10.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is what we measure. (a) True (b) False
11. 11.True or false: a mirror is needed for the yeast balloon. (a) True (b) False
12. 12.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
13. 13.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
14. 14.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
15. 15.⚖️ 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) True (b) False
16. 16.True or false: salt is something yeast does not need. (a) False (b) True
17. 17.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) dry yeast (c) turmeric powder (d) warm water
18. 18.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) warm water (d) sunlight
19. 19.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
20. 20.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
21. 21.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
22. 22.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) air from outside (c) carbon dioxide gas (d) steam
23. 23.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to clean floors (c) to wash dishes (d) to colour rice
24. 24.🍞 Which of these is something yeast needs? (a) a magnet (b) salt (c) sunlight (d) time
25. 25.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
26. 26.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it bursts at once (c) it grows very little (d) it grows much faster
27. 27.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
28. 28.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold water is heavy (c) cold kills sugar (d) cold makes it pink
29. 29.🧺 Which of these is not needed for the yeast balloon? (a) a battery cell (b) warm water (c) dry yeast (d) a small bottle
30. 30.⚖️ 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 measure it (b) we keep it the same (c) we change it
31. 31.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
32. 32.⚖️ 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
33. 33.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it glows (c) it grows faster (d) it turns to sugar
34. 34.⚖️ 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 measure it (c) we keep it the same
35. 35.True or false: a comb is needed for the yeast balloon. (a) True (b) False
36. 36.⚖️ 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 keep it the same (c) we measure it
37. 37.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a battery cell (c) a balloon (d) turmeric powder
38. 38.⚖️ 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
39. 39.True or false: a balloon is not needed for the yeast balloon. (a) False (b) True
40. 40.True or false: a mirror is not needed for the yeast balloon. (a) True (b) False

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