Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 346 · 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.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
2. 2.⚖️ 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 same bottles (c) the amount of sugar (d) the water temperature
3. 3.🍞 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
4. 4.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) sugar (c) a magnet (d) dry yeast
5. 5.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) salt (d) sugar
6. 6.True or false: a paper clip is not needed for the yeast balloon. (a) False (b) True
7. 7.⚖️ 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 amount of sugar (c) size of the balloon (d) the water temperature
8. 8.True or false: a battery cell is not needed for the yeast balloon. (a) True (b) False
9. 9.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) pour it down the sink (c) throw it at a wall (d) keep it for a month
10. 10.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
11. 11.🔍 Which is the odd one out? (a) sugar (b) warm water (c) time (d) a magnet
12. 12.⚖️ 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 change it (b) we measure it (c) we keep it the same
13. 13.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
14. 14.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
15. 15.True or false: a mirror is needed for the yeast balloon. (a) False (b) True
16. 16.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) smoke (c) air from outside (d) steam
17. 17.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it grows much faster (c) it bursts at once (d) it turns yellow
18. 18.🍞 Which of these is something yeast needs? (a) salt (b) time (c) vinegar (d) a magnet
19. 19.True or false: time is something yeast does not need. (a) True (b) False
20. 20.True or false: vinegar is something yeast needs. (a) True (b) False
21. 21.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
22. 22.True or false: a paper clip is needed for the yeast balloon. (a) False (b) True
23. 23.True or false: a balloon is not needed for the yeast balloon. (a) False (b) True
24. 24.True or false: sugar is needed for the yeast balloon. (a) False (b) True
25. 25.🔮 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
26. 26.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a battery cell (c) dry yeast (d) a paper clip
27. 27.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to colour rice (c) to wash dishes (d) to clean floors
28. 28.🔍 Which is the odd one out? (a) a magnet (b) sunlight (c) sugar (d) salt
29. 29.⚖️ 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
30. 30.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
31. 31.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a balloon (c) warm water (d) a mirror
32. 32.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is the one thing we change. (a) False (b) True
33. 33.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
34. 34.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
35. 35.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a magnet (c) warm water (d) a small bottle
36. 36.⚖️ 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 change it (b) we measure it (c) we keep it the same
37. 37.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
38. 38.True or false: sunlight is something yeast needs. (a) False (b) True
39. 39.⚖️ 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 same bottles
40. 40.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it glows (c) it grows faster (d) the yeast is killed

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