Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 927 · 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.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) the yeast is killed (c) it turns to sugar (d) it glows
2. 2.True or false: sugar is needed for the yeast balloon. (a) True (b) False
3. 3.⚖️ 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) True (b) False
4. 4.True or false: a small bottle is not needed for the yeast balloon. (a) False (b) True
5. 5.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to make it sweet (c) it is food for yeast (d) to colour it
6. 6.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to colour rice (c) to make bread rise (d) to clean floors
7. 7.⚖️ 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
8. 8.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it bursts at once (c) it turns yellow (d) it grows much faster
9. 9.⚖️ 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 same bottles
10. 10.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
11. 11.🧺 Which of these is not needed for the yeast balloon? (a) turmeric powder (b) sugar (c) warm water (d) a small bottle
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 amount of water (b) the same bottles (c) size of the balloon (d) the water temperature
13. 13.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
14. 14.True or false: time is something yeast needs. (a) False (b) True
15. 15.True or false: a battery cell is needed for the yeast balloon. (a) False (b) True
16. 16.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) a small bottle (c) dry yeast (d) sugar
17. 17.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a small bottle (c) a magnet (d) a balloon
18. 18.True or false: sugar is something yeast needs. (a) True (b) False
19. 19.⚖️ 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
20. 20.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold water is heavy (c) cold makes it pink (d) cold kills sugar
21. 21.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) a mirror (c) a comb (d) a battery cell
22. 22.⚖️ 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) True (b) False
23. 23.🔍 Which is the odd one out? (a) time (b) salt (c) sunlight (d) vinegar
24. 24.🔍 Which is the odd one out? (a) sugar (b) time (c) warm water (d) vinegar
25. 25.True or false: a magnet is needed for the yeast balloon. (a) False (b) True
26. 26.True or false: salt is something yeast needs. (a) False (b) True
27. 27.⚖️ 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 measure it (b) we keep it the same (c) we change it
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) a small bottle (c) a balloon (d) dry yeast
29. 29.True or false: a comb is needed for the yeast balloon. (a) True (b) False
30. 30.🍞 Which of these is something yeast needs? (a) time (b) salt (c) vinegar (d) sunlight
31. 31.📘 What is yeast? (a) a tiny living fungus (b) a kind of sugar (c) a kind of salt (d) a kind of stone
32. 32.🍞 Which of these is something yeast needs? (a) salt (b) warm water (c) vinegar (d) a magnet
33. 33.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) it turns to bread (c) the balloon is bigger (d) it shrinks to nothing
34. 34.🛟 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
35. 35.⚖️ 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 yeast (c) size of the balloon
36. 36.True or false: a mirror is needed for the yeast balloon. (a) False (b) True
37. 37.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
38. 38.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a paper clip (c) warm water (d) a small bottle
39. 39.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the amount of yeast (b) size of the balloon (c) the amount of water (d) the amount of sugar
40. 40.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a magnet (c) a balloon (d) a battery cell

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