Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 382 · 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.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to make it heavy (c) to colour it (d) it is food for yeast
2. 2.⚖️ 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
3. 3.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is bigger (c) it shrinks to nothing (d) the balloon is smaller
4. 4.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) sunlight (d) time
5. 5.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a small bottle (c) a battery cell (d) a balloon
6. 6.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
7. 7.🔍 Which is the odd one out? (a) a magnet (b) vinegar (c) warm water (d) sunlight
8. 8.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
9. 9.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
10. 10.True or false: a balloon is needed for the yeast balloon. (a) True (b) False
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 yeast (b) the amount of water (c) the amount of sugar (d) the water temperature
12. 12.🔍 Which is the odd one out? (a) time (b) sugar (c) vinegar (d) warm water
13. 13.🍞 Which of these is something yeast needs? (a) sunlight (b) salt (c) a magnet (d) sugar
14. 14.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) keep it for a month (c) put it in your mouth (d) pour it down the sink
15. 15.⚖️ 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) True (b) False
16. 16.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
17. 17.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) dry yeast (c) a magnet (d) a comb
18. 18.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the amount of sugar (b) size of the balloon (c) the water temperature
19. 19.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it turns to sugar (c) it grows faster (d) the yeast is killed
20. 20.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to make bread rise (c) to clean floors (d) to wash dishes
21. 21.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
22. 22.⚖️ 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
23. 23.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
24. 24.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a mirror (c) a balloon (d) a paper clip
25. 25.True or false: time is something yeast does not need. (a) True (b) False
26. 26.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
27. 27.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
28. 28.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) size of the balloon (b) the amount of water (c) the amount of yeast (d) the same bottles
29. 29.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
30. 30.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
31. 31.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) a mirror (c) dry yeast (d) a balloon
32. 32.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a paper clip (d) warm water
33. 33.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
34. 34.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) warm water (d) vinegar
35. 35.True or false: a small bottle is needed for the yeast balloon. (a) False (b) True
36. 36.⚖️ 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
37. 37.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) a small bottle (c) a balloon (d) warm water
38. 38.True or false: warm water is something yeast does not need. (a) True (b) False
39. 39.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows much faster (c) it bursts at once (d) it grows very little
40. 40.🔍 Which is the odd one out? (a) sunlight (b) time (c) salt (d) vinegar

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