Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 782 · 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 of these is needed for the yeast balloon? (a) a comb (b) a magnet (c) sugar (d) a paper clip
2. 2.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) pour it down the sink (c) keep it for a month (d) put it in your mouth
3. 3.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a small bottle (c) dry yeast (d) a battery cell
4. 4.🔍 Which is the odd one out? (a) vinegar (b) sugar (c) a magnet (d) sunlight
5. 5.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a mirror (d) a balloon
6. 6.True or false: a paper clip is needed for the yeast balloon. (a) True (b) False
7. 7.🍞 Which of these is something yeast needs? (a) vinegar (b) sunlight (c) warm water (d) salt
8. 8.⚖️ 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 amount of yeast (c) the amount of water (d) the water temperature
9. 9.🔍 Which is the odd one out? (a) warm water (b) time (c) sugar (d) vinegar
10. 10.True or false: time is something yeast does not need. (a) False (b) True
11. 11.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a mirror (c) a small bottle (d) sugar
12. 12.⚖️ 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
13. 13.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) sugar (d) a comb
14. 14.🧺 Which of these is needed for the yeast balloon? (a) dry yeast (b) a comb (c) a magnet (d) turmeric powder
15. 15.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
16. 16.📘 What is yeast? (a) a kind of sugar (b) a tiny living fungus (c) a kind of salt (d) a kind of stone
17. 17.🔍 Which is the odd one out? (a) sunlight (b) salt (c) vinegar (d) warm water
18. 18.True or false: sunlight is something yeast needs. (a) True (b) False
19. 19.🛟 The water for the yeast should be ___. (a) ice cold (b) warm, not hot (c) very salty (d) boiling hot
20. 20.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a small bottle (c) warm water (d) a comb
21. 21.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it turns yellow (c) it grows very little (d) it grows much faster
22. 22.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
23. 23.🔍 Which is the odd one out? (a) vinegar (b) time (c) salt (d) sunlight
24. 24.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
25. 25.True or false: vinegar is something yeast needs. (a) False (b) True
26. 26.True or false: a comb is not needed for the yeast balloon. (a) False (b) True
27. 27.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) sugar (c) a balloon (d) a magnet
28. 28.🔮 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 smaller (d) the balloon is bigger
29. 29.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) warm water (c) a balloon (d) a paper clip
30. 30.True or false: warm water is something yeast needs. (a) True (b) False
31. 31.True or false: a mirror is not needed for the yeast balloon. (a) False (b) True
32. 32.🍞 Which of these is something yeast does not need? (a) sugar (b) sunlight (c) time (d) warm water
33. 33.True or false: a small bottle is needed for the yeast balloon. (a) True (b) False
34. 34.True or false: a mirror is 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 amount of yeast”? (a) we keep it the same (b) we measure it (c) we change it
36. 36.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
37. 37.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it glows (c) the yeast is killed (d) it grows faster
38. 38.🔍 Which is the odd one out? (a) sugar (b) time (c) a magnet (d) warm water
39. 39.True or false: salt is something yeast needs. (a) True (b) False
40. 40.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) turmeric powder (c) dry yeast (d) a balloon

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