Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 677 · 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: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows very little (c) it turns yellow (d) it grows much faster
2. 2.🔍 Which is the odd one out? (a) salt (b) sugar (c) vinegar (d) sunlight
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.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
5. 5.⚖️ 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 change it (b) we keep it the same (c) we measure it
6. 6.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
7. 7.⚖️ 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) the same bottles (b) the amount of yeast (c) size of the balloon (d) the water temperature
8. 8.⚖️ 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 measure it (c) we keep it the same
9. 9.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
10. 10.🔍 Which is the odd one out? (a) sunlight (b) time (c) warm water (d) sugar
11. 11.True or false: sunlight is something yeast does not need. (a) False (b) True
12. 12.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) throw it at a wall (c) pour it down the sink (d) keep it for a month
13. 13.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a magnet (c) a small bottle (d) a comb
14. 14.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to colour rice (c) to wash dishes (d) to make bread rise
15. 15.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold kills sugar (c) cold water is heavy (d) cold slows yeast down
16. 16.🛟 The water for the yeast should be ___. (a) very salty (b) boiling hot (c) warm, not hot (d) ice cold
17. 17.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) warm water (c) a comb (d) a battery cell
18. 18.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
19. 19.True or false: time is something yeast does not need. (a) True (b) False
20. 20.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
21. 21.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a magnet (c) a paper clip (d) a balloon
22. 22.🔍 Which is the odd one out? (a) vinegar (b) sugar (c) time (d) warm water
23. 23.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is what we measure. (a) False (b) True
24. 24.🔍 Which is the odd one out? (a) vinegar (b) salt (c) a magnet (d) warm water
25. 25.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
26. 26.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is what we measure. (a) False (b) True
27. 27.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
28. 28.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is bigger (c) the balloon is smaller (d) it turns to bread
29. 29.True or false: a magnet is something yeast needs. (a) True (b) False
30. 30.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) the yeast is killed (c) it turns to sugar (d) it glows
31. 31.🧺 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) warm water
32. 32.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
33. 33.⚖️ 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
34. 34.🔍 Which is the odd one out? (a) time (b) salt (c) a magnet (d) sunlight
35. 35.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
36. 36.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
37. 37.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a comb (c) a magnet (d) sugar
38. 38.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) sugar (c) warm water (d) a balloon
39. 39.⚖️ 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 keep it the same (b) we measure it (c) we change it
40. 40.True or false: turmeric powder is needed for the yeast balloon. (a) False (b) True

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