Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 441 · 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 is the odd one out? (a) time (b) salt (c) vinegar (d) sunlight
2. 2.True or false: a mirror is needed for the yeast balloon. (a) True (b) False
3. 3.🍞 Which of these is something yeast needs? (a) a magnet (b) warm water (c) salt (d) sunlight
4. 4.🛟 The water for the yeast should be ___. (a) boiling hot (b) very salty (c) warm, not hot (d) ice cold
5. 5.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it turns to sugar (c) it grows faster (d) the yeast is killed
6. 6.🔍 Which is the odd one out? (a) warm water (b) a magnet (c) time (d) sugar
7. 7.⚖️ 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
8. 8.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) steam (c) carbon dioxide gas (d) air from outside
9. 9.True or false: a paper clip is needed for the yeast balloon. (a) True (b) False
10. 10.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) warm water (c) turmeric powder (d) a mirror
11. 11.⚖️ 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 amount of water (c) the water temperature (d) size of the balloon
12. 12.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
13. 13.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is what we measure. (a) False (b) True
14. 14.True or false: a mirror is not needed for the yeast balloon. (a) False (b) True
15. 15.True or false: warm water is needed for the yeast balloon. (a) False (b) True
16. 16.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is bigger (c) the balloon is smaller (d) it turns to bread
17. 17.True or false: a magnet is something yeast needs. (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 amount of sugar is the one thing we change. (a) True (b) False
19. 19.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) put it in your mouth (c) throw it at a wall (d) keep it for a month
20. 20.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
21. 21.⚖️ 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
22. 22.🔍 Which is the odd one out? (a) salt (b) warm water (c) sugar (d) time
23. 23.⚖️ 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 water temperature (b) the amount of sugar (c) the amount of water (d) the amount of yeast
24. 24.True or false: a battery cell is needed for the yeast balloon. (a) True (b) False
25. 25.🔍 Which is the odd one out? (a) a magnet (b) warm water (c) vinegar (d) sunlight
26. 26.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) salt (d) time
27. 27.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a small bottle (c) turmeric powder (d) dry yeast
28. 28.True or false: a magnet is something yeast does not need. (a) False (b) True
29. 29.True or false: salt is something yeast does not need. (a) False (b) True
30. 30.⚖️ 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 measure it (b) we keep it the same (c) we change it
31. 31.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
32. 32.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of water”? (a) we keep it the same (b) we measure it (c) we change it
33. 33.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
34. 34.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a small bottle (c) a mirror (d) turmeric powder
35. 35.🍞 Which of these is something yeast needs? (a) sugar (b) sunlight (c) salt (d) a magnet
36. 36.🍞 Which of these is something yeast needs? (a) vinegar (b) salt (c) sunlight (d) time
37. 37.True or false: a balloon is not needed for the yeast balloon. (a) False (b) True
38. 38.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
39. 39.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
40. 40.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to wash dishes (c) to clean floors (d) to make bread rise

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