Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 529 · 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? Which of these is the one thing we change? (a) the water temperature (b) the amount of yeast (c) size of the balloon (d) the amount of water
2. 2.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it turns to sugar (c) it glows (d) the yeast is killed
3. 3.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
4. 4.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
5. 5.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need 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 amount of yeast”? (a) we measure it (b) we keep it the same (c) we change it
8. 8.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
9. 9.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
10. 10.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) sugar (c) a balloon (d) a magnet
11. 11.⚖️ 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) size of the balloon (c) the water temperature
12. 12.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
13. 13.🍞 Which of these is something yeast does not need? (a) time (b) sunlight (c) sugar (d) warm water
14. 14.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) dry yeast (c) a battery cell (d) a mirror
15. 15.🍞 Which of these is something yeast needs? (a) vinegar (b) a magnet (c) time (d) salt
16. 16.🔍 Which is the odd one out? (a) salt (b) warm water (c) sugar (d) time
17. 17.⚖️ 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
18. 18.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
19. 19.True or false: vinegar is something yeast does not need. (a) False (b) True
20. 20.🔍 Which is the odd one out? (a) sunlight (b) vinegar (c) time (d) a magnet
21. 21.⚖️ 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 keep it the same (b) we change it (c) we measure it
22. 22.True or false: sunlight is something yeast needs. (a) True (b) False
23. 23.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a small bottle (c) a magnet (d) turmeric powder
24. 24.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a battery cell (c) a small bottle (d) sugar
25. 25.🛟 The water for the yeast should be ___. (a) ice cold (b) very salty (c) boiling hot (d) warm, not hot
26. 26.True or false: a magnet is needed for the yeast balloon. (a) False (b) True
27. 27.True or false: a mirror is needed for the yeast balloon. (a) True (b) False
28. 28.True or false: a balloon is not needed for the yeast balloon. (a) False (b) True
29. 29.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the same bottles (b) size of the balloon (c) the water temperature
30. 30.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
31. 31.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
32. 32.🍞 Which of these is something yeast needs? (a) vinegar (b) salt (c) a magnet (d) warm water
33. 33.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a mirror (c) sugar (d) dry yeast
34. 34.⚖️ 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
35. 35.⚖️ 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 sugar (b) the same bottles (c) the amount of yeast (d) size of the balloon
36. 36.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) pour it down the sink (c) put it in your mouth (d) keep it for a month
37. 37.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold kills sugar (c) cold water is heavy (d) cold slows yeast down
38. 38.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is smaller (c) it shrinks to nothing (d) the balloon is bigger
39. 39.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
40. 40.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it bursts at once (c) it grows much faster (d) it grows very little

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