Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 647 · 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 “the same bottles”? (a) we change it (b) we keep it the same (c) we measure it
2. 2.🔍 Which is the odd one out? (a) time (b) sugar (c) warm water (d) salt
3. 3.🍞 Which of these is something yeast needs? (a) a magnet (b) vinegar (c) salt (d) time
4. 4.🔍 Which is the odd one out? (a) sugar (b) a magnet (c) salt (d) sunlight
5. 5.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) warm water (d) a comb
6. 6.⚖️ 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 change it (c) we measure it
7. 7.🍞 Which of these is something yeast needs? (a) salt (b) a magnet (c) vinegar (d) sugar
8. 8.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
9. 9.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) salt (d) sugar
10. 10.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold kills sugar (c) cold water is heavy (d) cold slows yeast down
11. 11.True or false: salt is something yeast needs. (a) False (b) True
12. 12.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it bursts at once (c) it grows very little (d) it grows much faster
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 measure it (b) we change it (c) we keep it the same
14. 14.True or false: warm water is something yeast needs. (a) False (b) True
15. 15.True or false: sunlight is something yeast does not need. (a) True (b) False
16. 16.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) turmeric powder (c) a magnet (d) sugar
17. 17.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
18. 18.True or false: a paper clip is not needed for the yeast balloon. (a) True (b) False
19. 19.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) the balloon is bigger (c) it shrinks to nothing (d) it turns to bread
20. 20.🔍 Which is the odd one out? (a) sugar (b) time (c) warm water (d) vinegar
21. 21.⚖️ 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) False (b) True
22. 22.🔍 Which is the odd one out? (a) sugar (b) time (c) a magnet (d) warm water
23. 23.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to wash dishes (c) to clean floors (d) to make bread rise
24. 24.True or false: a mirror is needed for the yeast balloon. (a) False (b) True
25. 25.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
26. 26.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a balloon (c) a mirror (d) warm water
27. 27.🔍 Which is the odd one out? (a) salt (b) time (c) sunlight (d) vinegar
28. 28.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
29. 29.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
30. 30.True or false: a battery cell is needed for the yeast balloon. (a) False (b) True
31. 31.⚖️ 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) size of the balloon (b) the amount of yeast (c) the water temperature (d) the same bottles
32. 32.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is the one thing we change. (a) False (b) True
33. 33.🧺 Which of these is needed for the yeast balloon? (a) a small bottle (b) a paper clip (c) a mirror (d) a magnet
34. 34.⚖️ 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 water (b) size of the balloon (c) the water temperature
35. 35.🛟 The water for the yeast should be ___. (a) very salty (b) boiling hot (c) ice cold (d) warm, not hot
36. 36.True or false: vinegar is something yeast does not need. (a) False (b) True
37. 37.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) throw it at a wall (c) put it in your mouth (d) pour it down the sink
38. 38.True or false: sugar is something yeast does not need. (a) False (b) True
39. 39.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) the yeast is killed (c) it grows faster (d) it turns to sugar
40. 40.⚖️ 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 keep it the same (b) we measure it (c) we change it

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