Yeast Balloon Experiment Worksheet

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

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