Yeast Balloon Experiment Worksheet

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

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