Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 918 · 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.🔮 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
2. 2.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) turmeric powder (c) a comb (d) dry yeast
3. 3.True or false: sugar is needed for the yeast balloon. (a) True (b) False
4. 4.True or false: a magnet is something yeast needs. (a) False (b) True
5. 5.🔍 Which is the odd one out? (a) a magnet (b) salt (c) sugar (d) vinegar
6. 6.⚖️ 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 keep it the same (b) we change it (c) we measure it
7. 7.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
8. 8.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
9. 9.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a magnet (c) dry yeast (d) sugar
10. 10.🛟 The water for the yeast should be ___. (a) very salty (b) boiling hot (c) warm, not hot (d) ice cold
11. 11.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
12. 12.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
13. 13.🔍 Which is the odd one out? (a) sugar (b) time (c) warm water (d) salt
14. 14.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
15. 15.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
16. 16.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows much faster (c) it grows very little (d) it turns yellow
17. 17.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) sugar (c) a battery cell (d) a magnet
18. 18.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a paper clip (c) a balloon (d) a small bottle
19. 19.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
20. 20.True or false: a paper clip is not needed for the yeast balloon. (a) True (b) False
21. 21.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold kills sugar (c) cold makes it pink (d) cold water is heavy
22. 22.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) it turns to bread (c) the balloon is bigger (d) the balloon is smaller
23. 23.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) sugar (d) a magnet
24. 24.True or false: sunlight is something yeast does not need. (a) False (b) True
25. 25.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to clean floors (c) to colour rice (d) to wash dishes
26. 26.🍞 Which of these is something yeast needs? (a) time (b) sunlight (c) salt (d) vinegar
27. 27.⚖️ 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
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) turmeric powder (c) a small bottle (d) sugar
29. 29.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) put it in your mouth (c) throw it at a wall (d) pour it down the sink
30. 30.⚖️ 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 keep it the same (b) we change it (c) we measure it
31. 31.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) sugar (c) a comb (d) a balloon
32. 32.True or false: sugar is something yeast does not need. (a) False (b) True
33. 33.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is the one thing we change. (a) False (b) True
34. 34.🔍 Which is the odd one out? (a) time (b) sugar (c) a magnet (d) warm water
35. 35.⚖️ 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
36. 36.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
37. 37.True or false: salt is something yeast does not need. (a) False (b) True
38. 38.True or false: time is something yeast does not need. (a) True (b) False
39. 39.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
40. 40.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed

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