Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 994 · 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.🛟 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
2. 2.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
3. 3.⚖️ 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) True (b) False
4. 4.⚖️ 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
5. 5.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a small bottle (c) warm water (d) a magnet
6. 6.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a comb (c) dry yeast (d) warm water
7. 7.🔮 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
8. 8.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to wash dishes (c) to colour rice (d) to make bread rise
9. 9.True or false: vinegar is something yeast needs. (a) True (b) False
10. 10.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) air from outside (c) smoke (d) steam
11. 11.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
12. 12.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) warm water (d) salt
13. 13.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a balloon (c) dry yeast (d) a paper clip
14. 14.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
15. 15.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold makes it pink (c) cold kills sugar (d) cold slows yeast down
16. 16.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a paper clip (c) a mirror (d) warm water
17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a mirror (c) dry yeast (d) warm water
18. 18.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it grows faster (c) the yeast is killed (d) it turns to sugar
19. 19.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
20. 20.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
21. 21.⚖️ 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 measure it (b) we keep it the same (c) we change it
22. 22.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a battery cell (c) a small bottle (d) dry yeast
23. 23.True or false: sunlight is something yeast does not need. (a) False (b) True
24. 24.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
25. 25.True or false: warm water is something yeast does not need. (a) True (b) False
26. 26.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a balloon (c) a mirror (d) a small bottle
27. 27.🔍 Which is the odd one out? (a) a magnet (b) salt (c) sugar (d) vinegar
28. 28.🛟 The water for the yeast should be ___. (a) warm, not hot (b) boiling hot (c) ice cold (d) very salty
29. 29.True or false: a magnet is something yeast does not need. (a) True (b) False
30. 30.🍞 Which of these is something yeast needs? (a) vinegar (b) time (c) salt (d) sunlight
31. 31.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
32. 32.True or false: salt is something yeast needs. (a) True (b) False
33. 33.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it turns yellow (c) it grows much faster (d) it bursts at once
34. 34.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
35. 35.True or false: a paper clip is not needed for the yeast balloon. (a) True (b) False
36. 36.🍞 Which of these is something yeast needs? (a) salt (b) warm water (c) vinegar (d) sunlight
37. 37.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) warm water (c) a magnet (d) dry yeast
38. 38.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a paper clip (c) warm water (d) sugar
39. 39.⚖️ 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
40. 40.⚖️ 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 sugar (c) the water temperature (d) the amount of yeast

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