Yeast Balloon Experiment Worksheet

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

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