Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 903 · 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.⚖️ 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
2. 2.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
3. 3.🍞 Which of these is something yeast needs? (a) vinegar (b) a magnet (c) salt (d) warm water
4. 4.📘 What is yeast? (a) a kind of stone (b) a kind of sugar (c) a kind of salt (d) a tiny living fungus
5. 5.⚖️ 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 keep it the same (c) we measure it
6. 6.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it grows faster (c) it turns to sugar (d) the yeast is killed
7. 7.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) turmeric powder (c) sugar (d) a comb
8. 8.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is the one thing we change. (a) False (b) True
9. 9.⚖️ 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 water temperature (c) the amount of yeast (d) the same bottles
10. 10.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) a comb (c) warm water (d) dry yeast
11. 11.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
12. 12.True or false: a balloon is not needed for the yeast balloon. (a) False (b) True
13. 13.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is what we measure. (a) False (b) True
14. 14.🧺 Which of these is needed for the yeast balloon? (a) a balloon (b) a paper clip (c) a magnet (d) a battery cell
15. 15.⚖️ 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 change it (b) we measure it (c) we keep it the same
16. 16.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) dry yeast (c) a mirror (d) a small bottle
17. 17.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) dry yeast (c) sugar (d) turmeric powder
18. 18.True or false: a magnet is something yeast needs. (a) False (b) True
19. 19.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) air from outside (c) smoke (d) steam
20. 20.⚖️ 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
21. 21.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
22. 22.⚖️ 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
23. 23.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) dry yeast (c) sugar (d) a balloon
24. 24.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) it turns to bread (c) it shrinks to nothing (d) the balloon is smaller
25. 25.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
26. 26.True or false: sunlight is something yeast does not need. (a) True (b) False
27. 27.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold makes it pink (c) cold slows yeast down (d) cold kills sugar
28. 28.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a magnet (c) warm water (d) a mirror
29. 29.⚖️ 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 measure it (c) we change it
30. 30.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to make bread rise (c) to colour rice (d) to clean floors
31. 31.True or false: a mirror is not needed for the yeast balloon. (a) False (b) True
32. 32.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) keep it for a month (c) put it in your mouth (d) throw it at a wall
33. 33.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) it is food for yeast (c) to colour it (d) to make it sweet
34. 34.True or false: sugar is something yeast needs. (a) True (b) False
35. 35.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
36. 36.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) sugar (c) a balloon (d) a comb
37. 37.🍞 Which of these is something yeast needs? (a) sunlight (b) a magnet (c) time (d) vinegar
38. 38.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) salt (d) warm water
39. 39.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
40. 40.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a battery cell (b) warm water (c) dry yeast (d) sugar

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