Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 643 · 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 glows (b) it grows faster (c) the yeast is killed (d) it turns to sugar
2. 2.True or false: a comb is not needed for the yeast balloon. (a) True (b) False
3. 3.⚖️ 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 change it (b) we keep it the same (c) we measure it
4. 4.🔍 Which is the odd one out? (a) warm water (b) sugar (c) time (d) sunlight
5. 5.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
6. 6.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) dry yeast (c) a small bottle (d) a balloon
7. 7.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) keep it for a month (c) pour it down the sink (d) throw it at a wall
8. 8.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
9. 9.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a mirror (c) sugar (d) turmeric powder
10. 10.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
11. 11.True or false: a paper clip is not needed for the yeast balloon. (a) True (b) False
12. 12.🍞 Which of these is something yeast needs? (a) vinegar (b) time (c) salt (d) sunlight
13. 13.🔍 Which is the odd one out? (a) warm water (b) time (c) salt (d) sugar
14. 14.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) smoke (c) air from outside (d) steam
15. 15.🛟 The water for the yeast should be ___. (a) ice cold (b) boiling hot (c) warm, not hot (d) very salty
16. 16.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
17. 17.⚖️ 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
18. 18.⚖️ 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
19. 19.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a battery cell (b) warm water (c) a small bottle (d) dry yeast
20. 20.⚖️ 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 sugar
21. 21.🔍 Which is the odd one out? (a) time (b) sunlight (c) vinegar (d) salt
22. 22.True or false: warm water is something yeast does not need. (a) True (b) False
23. 23.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) it turns to bread (c) the balloon is bigger (d) it shrinks to nothing
24. 24.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a battery cell (c) dry yeast (d) sugar
25. 25.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) turmeric powder (b) dry yeast (c) warm water (d) sugar
26. 26.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
27. 27.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a paper clip (c) a comb (d) dry yeast
28. 28.🔍 Which is the odd one out? (a) vinegar (b) a magnet (c) sunlight (d) warm water
29. 29.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a balloon (c) warm water (d) a comb
30. 30.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
31. 31.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
32. 32.⚖️ 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 keep it the same (b) we change it (c) we measure it
33. 33.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a paper clip (c) a small bottle (d) a battery cell
34. 34.True or false: sugar is needed for the yeast balloon. (a) True (b) False
35. 35.🔍 Which is the odd one out? (a) time (b) warm water (c) sugar (d) vinegar
36. 36.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to make bread rise (c) to colour rice (d) to wash dishes
37. 37.True or false: sunlight is something yeast needs. (a) True (b) False
38. 38.🍞 Which of these is something yeast does not need? (a) warm water (b) salt (c) time (d) sugar
39. 39.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it grows very little (c) it turns yellow (d) it bursts at once
40. 40.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is kept the same. (a) False (b) True

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