Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 933 · 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: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is bigger (c) it turns to bread (d) the balloon is smaller
2. 2.🔍 Which is the odd one out? (a) sugar (b) time (c) warm water (d) salt
3. 3.🧺 Which of these is not needed for the yeast balloon? (a) a mirror (b) a small bottle (c) a balloon (d) sugar
4. 4.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a paper clip (c) warm water (d) a mirror
5. 5.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) sunlight (d) sugar
6. 6.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
7. 7.True or false: a battery cell is not needed for the yeast balloon. (a) False (b) True
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 what we measure. (a) True (b) False
9. 9.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it grows very little (c) it bursts at once (d) it turns yellow
10. 10.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
11. 11.True or false: warm water is something yeast needs. (a) True (b) False
12. 12.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to clean floors (c) to make bread rise (d) to wash dishes
13. 13.True or false: a small bottle is not needed for the yeast balloon. (a) False (b) True
14. 14.🍞 Which of these is something yeast needs? (a) sunlight (b) salt (c) a magnet (d) time
15. 15.🍞 Which of these is something yeast needs? (a) a magnet (b) warm water (c) vinegar (d) sunlight
16. 16.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) warm, not hot (d) very salty
17. 17.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) sugar (d) vinegar
18. 18.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold makes it pink (c) cold kills sugar (d) cold slows yeast down
19. 19.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
20. 20.True or false: time is something yeast needs. (a) True (b) False
21. 21.⚖️ 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 change it (b) we measure it (c) we keep it the same
22. 22.⚖️ 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
23. 23.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it turns to sugar (c) the yeast is killed (d) it glows
24. 24.🧺 Which of these is needed for the yeast balloon? (a) a balloon (b) a mirror (c) a paper clip (d) turmeric powder
25. 25.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
26. 26.⚖️ 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
27. 27.⚖️ 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 water (b) the amount of yeast (c) size of the balloon (d) the same bottles
28. 28.⚖️ 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 change it (c) we keep it the same
29. 29.⚖️ 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) False (b) True
30. 30.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) keep it for a month (c) pour it down the sink (d) throw it at a wall
31. 31.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
32. 32.True or false: warm water is needed for the yeast balloon. (a) False (b) True
33. 33.⚖️ 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 water temperature (c) the amount of yeast (d) size of the balloon
34. 34.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
35. 35.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) turmeric powder (c) warm water (d) dry yeast
36. 36.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
37. 37.True or false: sugar is something yeast does not need. (a) False (b) True
38. 38.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) sugar (d) a comb
39. 39.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) sugar (c) dry yeast (d) warm water
40. 40.True or false: sunlight is something yeast does not need. (a) False (b) True

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