Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 721 · 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.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to make bread rise (c) to colour rice (d) to wash dishes
2. 2.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
3. 3.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold water is heavy (c) cold slows yeast down (d) cold kills sugar
4. 4.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
5. 5.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows very little (c) it grows much faster (d) it bursts at once
6. 6.True or false: a magnet is something yeast needs. (a) False (b) True
7. 7.🔍 Which is the odd one out? (a) warm water (b) time (c) sugar (d) salt
8. 8.⚖️ 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
9. 9.🍞 Which of these is something yeast needs? (a) vinegar (b) a magnet (c) sunlight (d) time
10. 10.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) it shrinks to nothing (c) the balloon is smaller (d) the balloon is bigger
11. 11.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it grows faster (c) it glows (d) the yeast is killed
12. 12.🔍 Which is the odd one out? (a) vinegar (b) a magnet (c) warm water (d) salt
13. 13.True or false: a small bottle is needed for the yeast balloon. (a) True (b) False
14. 14.🔍 Which is the odd one out? (a) sugar (b) a magnet (c) warm water (d) time
15. 15.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) throw it at a wall (c) keep it for a month (d) pour it down the sink
16. 16.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) turmeric powder (c) a balloon (d) a small bottle
17. 17.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) size of the balloon (b) the water temperature (c) the amount of water
18. 18.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) carbon dioxide gas (c) smoke (d) air from outside
19. 19.🛟 The water for the yeast should be ___. (a) ice cold (b) very salty (c) warm, not hot (d) boiling hot
20. 20.True or false: warm water is something yeast does not need. (a) True (b) False
21. 21.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) sugar (c) a small bottle (d) dry yeast
22. 22.📘 What is yeast? (a) a kind of salt (b) a kind of stone (c) a tiny living fungus (d) a kind of sugar
23. 23.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
24. 24.🧺 Which of these is not needed for the yeast balloon? (a) a paper clip (b) a balloon (c) sugar (d) a small bottle
25. 25.🔍 Which is the odd one out? (a) sugar (b) warm water (c) sunlight (d) time
26. 26.True or false: a small bottle is not needed for the yeast balloon. (a) False (b) True
27. 27.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a magnet (c) a mirror (d) sugar
28. 28.⚖️ 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 keep it the same (b) we measure it (c) we change it
29. 29.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a battery cell (c) a balloon (d) a paper clip
30. 30.⚖️ 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) True (b) False
31. 31.⚖️ 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
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 change it (b) we keep it the same (c) we measure it
33. 33.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
34. 34.🔍 Which is the odd one out? (a) salt (b) sugar (c) vinegar (d) sunlight
35. 35.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
36. 36.🍞 Which of these is something yeast needs? (a) sunlight (b) warm water (c) salt (d) a magnet
37. 37.True or false: warm water is something yeast needs. (a) False (b) True
38. 38.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) a small bottle (c) dry yeast (d) sugar
39. 39.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) salt (d) sugar
40. 40.True or false: sugar is something yeast does not need. (a) True (b) False

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