Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 98 · 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: vinegar is something yeast needs. (a) True (b) False
2. 2.True or false: vinegar is something yeast does not need. (a) True (b) False
3. 3.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
4. 4.True or false: sugar is something yeast needs. (a) True (b) False
5. 5.⚖️ 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
6. 6.🛟 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
7. 7.🧺 Which of these is needed for the yeast balloon? (a) a balloon (b) turmeric powder (c) a magnet (d) a paper clip
8. 8.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold slows yeast down (c) cold makes it pink (d) cold kills sugar
9. 9.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to colour it (c) it is food for yeast (d) to make it sweet
10. 10.🧺 Which of these is needed for the yeast balloon? (a) sugar (b) a paper clip (c) turmeric powder (d) a battery cell
11. 11.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
12. 12.🍞 Which of these is something yeast needs? (a) salt (b) time (c) a magnet (d) sunlight
13. 13.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
14. 14.🍞 Which of these is something yeast needs? (a) vinegar (b) warm water (c) salt (d) sunlight
15. 15.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it grows faster (c) the yeast is killed (d) it glows
16. 16.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
17. 17.True or false: salt is something yeast does not need. (a) True (b) False
18. 18.True or false: warm water is something yeast needs. (a) False (b) True
19. 19.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is the one thing we change. (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 the one thing we change? (a) size of the balloon (b) the amount of yeast (c) the water temperature (d) the amount of sugar
21. 21.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
22. 22.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
23. 23.⚖️ 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 change it (b) we measure it (c) we keep it the same
24. 24.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) warm water (c) dry yeast (d) a mirror
25. 25.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
26. 26.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) a magnet (d) time
27. 27.⚖️ 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 change it (b) we measure it (c) we keep it the same
28. 28.⚖️ 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 keep it the same (c) we change it
29. 29.🍞 Which of these is something yeast does not need? (a) vinegar (b) warm water (c) sugar (d) time
30. 30.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) a small bottle (d) a magnet
31. 31.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) a small bottle (c) a balloon (d) dry yeast
32. 32.True or false: sunlight is something yeast does not need. (a) False (b) True
33. 33.🧺 Which of these is not needed for the yeast balloon? (a) a comb (b) a balloon (c) sugar (d) dry yeast
34. 34.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) it turns to bread (c) the balloon is bigger (d) it shrinks to nothing
35. 35.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) a paper clip (d) a balloon
36. 36.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
37. 37.True or false: a paper clip is not needed for the yeast balloon. (a) True (b) False
38. 38.⚖️ 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 measure it (b) we keep it the same (c) we change it
39. 39.⚖️ 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
40. 40.⚖️ 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

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