Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 555 · 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.🔍 Which is the odd one out? (a) a magnet (b) sugar (c) vinegar (d) salt
2. 2.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to colour it (c) it is food for yeast (d) to make it sweet
3. 3.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is smaller (c) it turns to bread (d) the balloon is bigger
4. 4.🔍 Which is the odd one out? (a) warm water (b) sugar (c) time (d) a magnet
5. 5.🍞 Which of these is something yeast needs? (a) salt (b) sunlight (c) sugar (d) vinegar
6. 6.🧺 Which of these is needed for the yeast balloon? (a) a balloon (b) a mirror (c) a magnet (d) a battery cell
7. 7.True or false: sunlight is something yeast does not need. (a) True (b) False
8. 8.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
9. 9.⚖️ 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 keep it the same (b) we change it (c) we measure it
10. 10.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
11. 11.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
12. 12.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a battery cell (c) turmeric powder (d) dry yeast
13. 13.⚖️ 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 water temperature (c) the amount of yeast (d) the amount of sugar
14. 14.⚖️ 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) True (b) False
15. 15.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) size of the balloon (b) the water temperature (c) the amount of sugar (d) the amount of yeast
16. 16.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is kept the same. (a) False (b) True
17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a mirror (c) warm water (d) dry yeast
18. 18.True or false: a mirror is needed for the yeast balloon. (a) True (b) False
19. 19.⚖️ 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
20. 20.🔍 Which is the odd one out? (a) salt (b) a magnet (c) time (d) vinegar
21. 21.⚖️ 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) True (b) False
22. 22.True or false: a small bottle is not needed for the yeast balloon. (a) False (b) True
23. 23.True or false: sunlight is something yeast needs. (a) True (b) False
24. 24.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
25. 25.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
26. 26.⚖️ 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
27. 27.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
28. 28.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a paper clip (c) warm water (d) a mirror
29. 29.True or false: sugar is something yeast needs. (a) True (b) False
30. 30.🧺 Which of these is not needed for the yeast balloon? (a) a comb (b) warm water (c) a small bottle (d) sugar
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.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold water is heavy (c) cold kills sugar (d) cold slows yeast down
33. 33.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it grows faster (c) it glows (d) the yeast is killed
34. 34.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a paper clip (c) sugar (d) a small bottle
35. 35.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
36. 36.⚖️ 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
37. 37.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
38. 38.⚖️ 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 keep it the same (c) we measure it
39. 39.🍞 Which of these is something yeast needs? (a) a magnet (b) salt (c) sunlight (d) warm water
40. 40.True or false: warm water is something yeast does not need. (a) True (b) False

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