Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 32 · 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.True or false: sugar is needed for the yeast balloon. (a) False (b) True
2. 2.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a battery cell (c) a small bottle (d) a balloon
3. 3.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a mirror (c) a comb (d) warm water
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a balloon (c) a magnet (d) warm water
5. 5.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
6. 6.🧺 Which of these is needed for the yeast balloon? (a) sugar (b) a comb (c) a magnet (d) a paper clip
7. 7.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) it is food for yeast (c) to make it heavy (d) to colour it
8. 8.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is the one thing we change. (a) True (b) False
9. 9.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
10. 10.🍞 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
11. 11.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a mirror (c) sugar (d) warm water
12. 12.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) put it in your mouth (c) throw it at a wall (d) keep it for a month
13. 13.🍞 Which of these is something yeast needs? (a) sunlight (b) a magnet (c) sugar (d) vinegar
14. 14.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
15. 15.🛟 The water for the yeast should be ___. (a) very salty (b) ice cold (c) boiling hot (d) warm, not hot
16. 16.🍞 Which of these is something yeast does not need? (a) sunlight (b) warm water (c) time (d) sugar
17. 17.True or false: a balloon is not needed for the yeast balloon. (a) False (b) True
18. 18.⚖️ 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
19. 19.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) vinegar (d) warm water
20. 20.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) salt (d) time
21. 21.⚖️ 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) the same bottles (d) size of the balloon
22. 22.True or false: time is something yeast does not need. (a) False (b) True
23. 23.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) size of the balloon (b) the water temperature (c) the amount of yeast
24. 24.🔮 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
25. 25.🔍 Which is the odd one out? (a) salt (b) sunlight (c) a magnet (d) sugar
26. 26.True or false: time is something yeast needs. (a) False (b) True
27. 27.True or false: a mirror is needed for the yeast balloon. (a) False (b) True
28. 28.⚖️ 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) size of the balloon (b) the amount of sugar (c) the water temperature (d) the amount of yeast
29. 29.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) a battery cell (d) a balloon
30. 30.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
31. 31.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
32. 32.⚖️ 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 change it (b) we measure it (c) we keep it the same
33. 33.True or false: a battery cell is needed for the yeast balloon. (a) True (b) False
34. 34.🔍 Which is the odd one out? (a) a magnet (b) warm water (c) sugar (d) time
35. 35.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is what we measure. (a) False (b) True
36. 36.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) sugar (c) dry yeast (d) a magnet
37. 37.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) turmeric powder (b) warm water (c) sugar (d) dry yeast
38. 38.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) warm water (c) a small bottle (d) a comb
39. 39.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a balloon (c) warm water (d) turmeric powder
40. 40.True or false: warm water is not needed for the yeast balloon. (a) True (b) False

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