Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 815 · 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 of these is needed for the yeast balloon? (a) dry yeast (b) a mirror (c) a magnet (d) turmeric powder
2. 2.⚖️ 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 keep it the same (b) we measure it (c) we change it
3. 3.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a mirror (c) a magnet (d) a small bottle
4. 4.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
5. 5.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
6. 6.⚖️ 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 measure it (b) we change it (c) we keep it the same
7. 7.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
8. 8.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) turmeric powder (c) sugar (d) dry yeast
9. 9.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) warm water (d) a magnet
10. 10.🍞 Which of these is something yeast does not need? (a) time (b) salt (c) warm water (d) sugar
11. 11.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
12. 12.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
13. 13.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
14. 14.True or false: warm water is something yeast needs. (a) True (b) False
15. 15.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) it turns to bread (c) it shrinks to nothing (d) the balloon is bigger
16. 16.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to wash dishes (c) to colour rice (d) to make bread rise
17. 17.True or false: a battery cell 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? True or false: the water temperature is the one thing we change. (a) True (b) False
19. 19.⚖️ 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 sugar (d) size of the balloon
20. 20.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is kept the same. (a) False (b) True
21. 21.True or false: time is something yeast needs. (a) True (b) False
22. 22.True or false: a mirror is not needed for the yeast balloon. (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 what we measure? (a) the water temperature (b) the amount of sugar (c) size of the balloon (d) the same bottles
24. 24.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a paper clip (c) a balloon (d) a small bottle
25. 25.⚖️ 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
26. 26.⚖️ 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 sugar (b) size of the balloon (c) the water temperature
27. 27.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a small bottle (c) sugar (d) a comb
28. 28.True or false: sugar is something yeast does not need. (a) True (b) False
29. 29.True or false: warm water is something yeast does not need. (a) True (b) False
30. 30.🍞 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
31. 31.🧺 Do we need a paper clip 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 “size of the balloon”? (a) we change it (b) we measure it (c) we keep it the same
33. 33.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
34. 34.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) sunlight (d) time
35. 35.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) warm water (c) a comb (d) dry yeast
36. 36.🍞 Which of these is something yeast needs? (a) a magnet (b) warm water (c) salt (d) vinegar
37. 37.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) sugar (c) a mirror (d) a small bottle
38. 38.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
39. 39.True or false: a paper clip is not needed for the yeast balloon. (a) True (b) False
40. 40.🛟 The water for the yeast should be ___. (a) warm, not hot (b) boiling hot (c) ice cold (d) very salty

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