Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 435 · 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.🍞 Which of these is something yeast does not need? (a) sunlight (b) time (c) warm water (d) sugar
2. 2.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
3. 3.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it bursts at once (c) it turns yellow (d) it grows very little
4. 4.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) pour it down the sink (c) put it in your mouth (d) throw it at a wall
5. 5.🔍 Which is the odd one out? (a) warm water (b) time (c) sugar (d) vinegar
6. 6.🔍 Which is the odd one out? (a) warm water (b) salt (c) a magnet (d) vinegar
7. 7.⚖️ 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 change it (c) we measure it
8. 8.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) warm water (c) a magnet (d) a comb
9. 9.🍞 Which of these is something yeast needs? (a) vinegar (b) sunlight (c) a magnet (d) time
10. 10.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
11. 11.True or false: a small bottle is needed for the yeast balloon. (a) True (b) False
12. 12.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
13. 13.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
14. 14.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
15. 15.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a magnet (c) a mirror (d) sugar
16. 16.🍞 Why do we add sugar to the yeast? (a) to colour it (b) it is food for yeast (c) to make it sweet (d) to make it heavy
17. 17.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
18. 18.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) salt (d) sugar
19. 19.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is what we measure. (a) True (b) False
20. 20.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) sugar (c) a small bottle (d) warm water
21. 21.🔮 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 bigger (d) the balloon is smaller
22. 22.🛟 The water for the yeast should be ___. (a) warm, not hot (b) very salty (c) ice cold (d) boiling hot
23. 23.🍞 Which of these is something yeast does not need? (a) vinegar (b) sugar (c) time (d) warm water
24. 24.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a magnet (c) a balloon (d) warm water
25. 25.True or false: time is something yeast needs. (a) True (b) False
26. 26.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a paper clip (c) warm water (d) sugar
27. 27.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
28. 28.⚖️ 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 amount of yeast (b) the water temperature (c) the same bottles (d) size of the balloon
29. 29.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold water is heavy (c) cold slows yeast down (d) cold makes it pink
30. 30.🔍 Which is the odd one out? (a) time (b) a magnet (c) vinegar (d) salt
31. 31.🍞 Which of these is something yeast needs? (a) salt (b) sunlight (c) vinegar (d) sugar
32. 32.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) dry yeast (c) a balloon (d) a battery cell
33. 33.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is kept the same. (a) False (b) True
34. 34.⚖️ 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 keep it the same (c) we measure it
35. 35.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
36. 36.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
37. 37.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a balloon (c) sugar (d) a mirror
38. 38.True or false: a magnet is not needed for the yeast balloon. (a) True (b) False
39. 39.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
40. 40.True or false: warm water is something yeast does not need. (a) True (b) False

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