Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 147 · 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 is the odd one out? (a) warm water (b) a magnet (c) sugar (d) time
2. 2.⚖️ 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) the same bottles (c) size of the balloon
3. 3.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
4. 4.True or false: warm water is needed for the yeast balloon. (a) False (b) True
5. 5.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
6. 6.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it turns yellow (c) it grows much faster (d) it grows very little
7. 7.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) a comb (d) a balloon
8. 8.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a balloon (c) a comb (d) a battery cell
9. 9.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold slows yeast down (c) cold makes it pink (d) cold water is heavy
10. 10.🔍 Which is the odd one out? (a) warm water (b) time (c) sunlight (d) sugar
11. 11.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) sugar (c) turmeric powder (d) warm water
12. 12.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is kept the same. (a) False (b) True
13. 13.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
14. 14.⚖️ 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
15. 15.⚖️ 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 amount of yeast (c) size of the balloon (d) the water temperature
16. 16.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is kept the same. (a) True (b) False
17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) sugar (c) turmeric powder (d) a balloon
18. 18.🍞 Which of these is something yeast needs? (a) a magnet (b) salt (c) warm water (d) vinegar
19. 19.True or false: sugar is something yeast does not need. (a) False (b) True
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 water
21. 21.🔍 Which is the odd one out? (a) salt (b) a magnet (c) sunlight (d) time
22. 22.True or false: salt is something yeast needs. (a) True (b) False
23. 23.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) put it in your mouth (c) pour it down the sink (d) keep it for a month
24. 24.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) dry yeast (c) a mirror (d) a magnet
25. 25.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) salt (d) time
26. 26.⚖️ 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 measure it (b) we change it (c) we keep it the same
27. 27.🍞 Does yeast need warm water 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) the amount of yeast (b) the amount of sugar (c) size of the balloon (d) the water temperature
29. 29.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
30. 30.🍞 Which of these is something yeast needs? (a) sugar (b) salt (c) sunlight (d) vinegar
31. 31.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) dry yeast (c) a balloon (d) a paper clip
32. 32.True or false: vinegar is something yeast needs. (a) True (b) False
33. 33.⚖️ 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 amount of yeast (c) the water temperature
34. 34.⚖️ 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) True (b) False
35. 35.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to colour rice (c) to make bread rise (d) to wash dishes
36. 36.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) the yeast is killed (c) it glows (d) it turns to sugar
37. 37.⚖️ 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 measure it (b) we change it (c) we keep it the same
38. 38.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) sugar (c) a small bottle (d) a comb
39. 39.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a magnet (c) a balloon (d) sugar
40. 40.🧺 Which of these is not needed for the yeast balloon? (a) a magnet (b) a balloon (c) dry yeast (d) sugar

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