Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 214 · 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.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
2. 2.⚖️ 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) True (b) False
3. 3.⚖️ 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) size of the balloon (c) the amount of yeast
4. 4.⚖️ 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
5. 5.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) it shrinks to nothing (c) the balloon is smaller (d) the balloon is bigger
6. 6.⚖️ 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) size of the balloon (c) the same bottles (d) the water temperature
7. 7.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
8. 8.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a comb (c) a mirror (d) sugar
9. 9.⚖️ 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
10. 10.⚖️ 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 measure it (b) we change it (c) we keep it the same
11. 11.True or false: a battery cell is not needed for the yeast balloon. (a) False (b) True
12. 12.🧺 Which of these is not needed for the yeast balloon? (a) a battery cell (b) sugar (c) warm water (d) a small bottle
13. 13.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
14. 14.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) sunlight (d) warm water
15. 15.🔍 Which is the odd one out? (a) time (b) warm water (c) salt (d) sugar
16. 16.🔍 Which is the odd one out? (a) sunlight (b) vinegar (c) a magnet (d) time
17. 17.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
18. 18.⚖️ 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
19. 19.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) air from outside (c) carbon dioxide gas (d) steam
20. 20.🔍 Which is the odd one out? (a) a magnet (b) time (c) sugar (d) warm water
21. 21.⚖️ 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 amount of sugar (c) the water temperature
22. 22.🍞 Which of these is something yeast needs? (a) vinegar (b) salt (c) sunlight (d) sugar
23. 23.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
24. 24.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
25. 25.True or false: warm water is something yeast does not need. (a) False (b) True
26. 26.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
27. 27.⚖️ 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 yeast (b) the water temperature (c) the amount of water (d) size of the balloon
28. 28.True or false: a paper clip is needed for the yeast balloon. (a) True (b) False
29. 29.True or false: a small bottle is not needed for the yeast balloon. (a) False (b) True
30. 30.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to make it heavy (c) it is food for yeast (d) to colour it
31. 31.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to clean floors (c) to colour rice (d) to wash dishes
32. 32.🔍 Which is the odd one out? (a) time (b) sugar (c) vinegar (d) warm water
33. 33.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows much faster (c) it grows very little (d) it bursts at once
34. 34.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is the one thing we change. (a) True (b) False
35. 35.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it glows (c) it grows faster (d) it turns to sugar
36. 36.True or false: a paper clip is not needed for the yeast balloon. (a) True (b) False
37. 37.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a mirror (c) dry yeast (d) sugar
38. 38.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) a magnet (c) a paper clip (d) a comb
39. 39.True or false: sunlight is something yeast needs. (a) False (b) True
40. 40.🧺 Which of these is needed for the yeast balloon? (a) a small bottle (b) a mirror (c) a magnet (d) a battery cell

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