Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 710 · 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? What do we do with “the amount of water”? (a) we keep it the same (b) we measure it (c) we change it
2. 2.🛟 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
3. 3.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to colour rice (c) to wash dishes (d) to make bread rise
4. 4.⚖️ 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 change it (c) we keep it the same
5. 5.True or false: sunlight is something yeast needs. (a) True (b) False
6. 6.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
7. 7.🧺 Which of these is needed for the yeast balloon? (a) a balloon (b) a battery cell (c) a paper clip (d) a comb
8. 8.⚖️ 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
9. 9.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to make it heavy (c) to make it sweet (d) to colour it
10. 10.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
11. 11.⚖️ 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
12. 12.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) a paper clip (c) sugar (d) a balloon
13. 13.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a comb (c) sugar (d) dry yeast
14. 14.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is smaller (c) the balloon is bigger (d) it shrinks to nothing
15. 15.True or false: sugar is something yeast needs. (a) False (b) True
16. 16.True or false: a small bottle is not needed for the yeast balloon. (a) False (b) True
17. 17.⚖️ 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) False (b) True
18. 18.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a magnet (c) a comb (d) warm water
19. 19.True or false: a battery cell is not needed for the yeast balloon. (a) True (b) False
20. 20.🍞 Which of these is something yeast needs? (a) sugar (b) a magnet (c) sunlight (d) salt
21. 21.⚖️ 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) False (b) True
22. 22.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) sugar (c) a paper clip (d) dry yeast
23. 23.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is what we measure. (a) True (b) False
24. 24.🔍 Which is the odd one out? (a) sunlight (b) time (c) warm water (d) sugar
25. 25.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
26. 26.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
27. 27.⚖️ 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
28. 28.True or false: a magnet is something yeast does not need. (a) True (b) False
29. 29.⚖️ 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 water (c) the amount of yeast (d) size of the balloon
30. 30.🍞 Which of these is something yeast needs? (a) a magnet (b) salt (c) time (d) sunlight
31. 31.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the amount of water (b) the water temperature (c) size of the balloon
32. 32.🛟 The water for the yeast should be ___. (a) ice cold (b) very salty (c) warm, not hot (d) boiling hot
33. 33.🧺 Which of these is needed for the yeast balloon? (a) a small bottle (b) a mirror (c) turmeric powder (d) a comb
34. 34.True or false: a magnet is something yeast needs. (a) True (b) False
35. 35.⚖️ 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
36. 36.True or false: turmeric powder is needed for the yeast balloon. (a) True (b) False
37. 37.True or false: sugar is something yeast does not need. (a) True (b) False
38. 38.True or false: warm water is something yeast does not need. (a) False (b) True
39. 39.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold water is heavy (c) cold slows yeast down (d) cold makes it pink
40. 40.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) sunlight (d) time

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