Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 291 · 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.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) dry yeast (c) a balloon (d) a small bottle
2. 2.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
3. 3.True or false: a battery cell is needed for the yeast balloon. (a) False (b) True
4. 4.🍞 Which of these is something yeast needs? (a) salt (b) warm water (c) a magnet (d) vinegar
5. 5.True or false: salt is something yeast needs. (a) False (b) True
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 yeast”? (a) we measure it (b) we change it (c) we keep it the same
7. 7.🛟 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
8. 8.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) sugar (d) salt
9. 9.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is the one thing we change. (a) True (b) False
10. 10.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) a paper clip (d) warm water
11. 11.🔮 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
12. 12.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
13. 13.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) warm water (d) sunlight
14. 14.True or false: a magnet is something yeast needs. (a) False (b) True
15. 15.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
16. 16.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
17. 17.True or false: a comb is not needed for the yeast balloon. (a) False (b) True
18. 18.True or false: sugar is something yeast does not need. (a) True (b) False
19. 19.True or false: sunlight is something yeast needs. (a) True (b) False
20. 20.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
21. 21.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is kept the same. (a) False (b) True
22. 22.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is what we measure. (a) False (b) True
23. 23.True or false: turmeric powder is needed for the yeast balloon. (a) True (b) False
24. 24.True or false: sugar is needed for the yeast balloon. (a) False (b) True
25. 25.🔍 Which is the odd one out? (a) warm water (b) sunlight (c) sugar (d) time
26. 26.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) smoke (c) air from outside (d) steam
27. 27.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a mirror (c) warm water (d) turmeric powder
28. 28.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a paper clip (c) turmeric powder (d) dry yeast
29. 29.🔍 Which is the odd one out? (a) a magnet (b) warm water (c) sunlight (d) vinegar
30. 30.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to clean floors (c) to colour rice (d) to wash dishes
31. 31.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it grows faster (c) it turns to sugar (d) it glows
32. 32.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
33. 33.📘 What is yeast? (a) a kind of stone (b) a kind of sugar (c) a kind of salt (d) a tiny living fungus
34. 34.🧺 Which of these is needed for the yeast balloon? (a) sugar (b) a magnet (c) a comb (d) a paper clip
35. 35.🍞 Which of these is something yeast needs? (a) salt (b) sunlight (c) sugar (d) vinegar
36. 36.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it grows much faster (c) it bursts at once (d) it turns yellow
37. 37.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is the one thing we change. (a) True (b) False
38. 38.⚖️ 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 measure it (b) we keep it the same (c) we change it
39. 39.⚖️ 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 measure it (c) we keep it the same
40. 40.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) warm, not hot (d) very salty

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