Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 71 · 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: a magnet is not needed for the yeast balloon. (a) False (b) True
2. 2.🔍 Which is the odd one out? (a) salt (b) vinegar (c) warm water (d) sunlight
3. 3.🍞 Which of these is something yeast needs? (a) vinegar (b) salt (c) time (d) sunlight
4. 4.True or false: warm water is needed for the yeast balloon. (a) True (b) False
5. 5.⚖️ 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 water
6. 6.True or false: a battery cell is not needed for the yeast balloon. (a) True (b) False
7. 7.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a mirror (c) sugar (d) warm water
8. 8.⚖️ 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
9. 9.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is kept the same. (a) False (b) True
10. 10.⚖️ 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
11. 11.🍞 Which of these is something yeast does not need? (a) sugar (b) vinegar (c) warm water (d) time
12. 12.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a small bottle (c) a mirror (d) a paper clip
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 amount of sugar (c) the same bottles (d) the water temperature
14. 14.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) a balloon (c) dry yeast (d) warm water
15. 15.🍞 Which of these is something yeast needs? (a) sugar (b) sunlight (c) a magnet (d) salt
16. 16.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
17. 17.🍞 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
18. 18.⚖️ 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
19. 19.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) sugar (d) sunlight
20. 20.🔍 Which is the odd one out? (a) warm water (b) sugar (c) time (d) a magnet
21. 21.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a comb (c) dry yeast (d) a battery cell
22. 22.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a comb (c) sugar (d) warm water
23. 23.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to make bread rise (c) to clean floors (d) to wash dishes
24. 24.⚖️ 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 amount of water (c) size of the balloon (d) the amount of yeast
25. 25.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) air from outside (c) steam (d) carbon dioxide gas
26. 26.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it grows faster (c) it turns to sugar (d) the yeast is killed
27. 27.⚖️ 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 measure it (b) we change it (c) we keep it the same
28. 28.🔮 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
29. 29.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a balloon (c) dry yeast (d) a mirror
30. 30.⚖️ 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
31. 31.True or false: time is something yeast needs. (a) False (b) True
32. 32.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) pour it down the sink (c) keep it for a month (d) put it in your mouth
33. 33.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) turmeric powder (c) a battery cell (d) a mirror
34. 34.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
35. 35.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the water temperature”? (a) we change it (b) we measure it (c) we keep it the same
36. 36.🔍 Which is the odd one out? (a) warm water (b) vinegar (c) time (d) sugar
37. 37.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a magnet (c) a small bottle (d) a balloon
38. 38.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the water temperature (b) the amount of sugar (c) size of the balloon
39. 39.🍞 Which of these is something yeast does not need? (a) a magnet (b) warm water (c) sugar (d) time
40. 40.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed

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