Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 606 · 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.True or false: a magnet is something yeast does not need. (a) True (b) False
2. 2.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the amount of water (b) the water temperature (c) size of the balloon (d) the amount of sugar
3. 3.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
4. 4.⚖️ 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 keep it the same (b) we measure it (c) we change it
5. 5.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) salt (d) warm water
6. 6.🛟 The water for the yeast should be ___. (a) ice cold (b) very salty (c) warm, not hot (d) boiling hot
7. 7.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
8. 8.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
9. 9.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) the balloon is bigger (c) it turns to bread (d) it shrinks to nothing
10. 10.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) warm water (c) a battery cell (d) sugar
11. 11.⚖️ 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 water (b) the same bottles (c) the amount of sugar (d) the water temperature
12. 12.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) keep it for a month (c) throw it at a wall (d) pour it down the sink
13. 13.🍞 Which of these is something yeast needs? (a) salt (b) time (c) sunlight (d) vinegar
14. 14.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
15. 15.🍞 Which of these is something yeast needs? (a) a magnet (b) salt (c) vinegar (d) sugar
16. 16.🍞 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
17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) a small bottle (d) a paper clip
18. 18.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
19. 19.⚖️ 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 keep it the same (c) we change it
20. 20.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a mirror (c) sugar (d) dry yeast
21. 21.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a mirror (c) a balloon (d) warm water
22. 22.🔍 Which is the odd one out? (a) sunlight (b) a magnet (c) warm water (d) salt
23. 23.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to make it sweet (c) to colour it (d) it is food for yeast
24. 24.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
25. 25.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
26. 26.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
27. 27.🔍 Which is the odd one out? (a) a magnet (b) sunlight (c) sugar (d) vinegar
28. 28.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
29. 29.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) warm water (d) a comb
30. 30.⚖️ 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
31. 31.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is kept the same. (a) True (b) False
32. 32.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the water temperature (b) size of the balloon (c) the amount of yeast
33. 33.🔍 Which is the odd one out? (a) warm water (b) a magnet (c) sugar (d) time
34. 34.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
35. 35.True or false: salt is something yeast does not need. (a) False (b) True
36. 36.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is kept the same. (a) False (b) True
37. 37.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
38. 38.🔍 Which is the odd one out? (a) time (b) sunlight (c) warm water (d) sugar
39. 39.🍞 Which of these is something yeast needs? (a) warm water (b) vinegar (c) salt (d) a magnet
40. 40.True or false: dry yeast is needed for the yeast balloon. (a) False (b) True

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