Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 708 · 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.⚖️ 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
2. 2.🍞 Which of these is something yeast needs? (a) sunlight (b) sugar (c) vinegar (d) a magnet
3. 3.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it glows (c) it grows faster (d) the yeast is killed
4. 4.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
5. 5.⚖️ 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 keep it the same (c) we change it
6. 6.⚖️ 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
7. 7.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
8. 8.🔍 Which is the odd one out? (a) sugar (b) time (c) warm water (d) sunlight
9. 9.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
10. 10.⚖️ 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
11. 11.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
12. 12.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it turns yellow (c) it grows very little (d) it bursts at once
13. 13.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to make bread rise (c) to colour rice (d) to clean floors
14. 14.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) time (d) salt
15. 15.True or false: a small bottle is needed for the yeast balloon. (a) False (b) True
16. 16.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a mirror (c) a comb (d) sugar
17. 17.True or false: sugar is something yeast does not need. (a) True (b) False
18. 18.True or false: vinegar is something yeast needs. (a) False (b) True
19. 19.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
20. 20.🔍 Which is the odd one out? (a) vinegar (b) sugar (c) warm water (d) time
21. 21.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) steam (c) smoke (d) air from outside
22. 22.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a paper clip (d) warm water
23. 23.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a battery cell (c) a small bottle (d) dry yeast
24. 24.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) throw it at a wall (c) pour it down the sink (d) put it in your mouth
25. 25.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) turmeric powder (c) a balloon (d) a comb
26. 26.🔍 Which is the odd one out? (a) a magnet (b) salt (c) vinegar (d) sugar
27. 27.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is the one thing we change. (a) False (b) True
28. 28.⚖️ 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 same bottles (c) the amount of yeast (d) the water temperature
29. 29.⚖️ 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) size of the balloon (d) the amount of yeast
30. 30.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
31. 31.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) sugar (c) turmeric powder (d) dry yeast
32. 32.True or false: a paper clip is needed for the yeast balloon. (a) False (b) True
33. 33.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a comb (c) sugar (d) warm water
34. 34.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
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 keep it the same (b) we change it (c) we measure it
36. 36.True or false: a magnet is something yeast does not need. (a) True (b) False
37. 37.🔍 Which is the odd one out? (a) sugar (b) time (c) a magnet (d) warm water
38. 38.True or false: sugar is needed for the yeast balloon. (a) False (b) True
39. 39.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
40. 40.True or false: warm water is not needed for the yeast balloon. (a) False (b) True

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