Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 627 · 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) salt (b) sunlight (c) a magnet (d) time
2. 2.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
3. 3.🧺 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 mirror
4. 4.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
5. 5.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
6. 6.🔍 Which is the odd one out? (a) vinegar (b) sugar (c) salt (d) a magnet
7. 7.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) warm, not hot (d) very salty
8. 8.🔮 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
9. 9.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a balloon (c) a magnet (d) dry yeast
10. 10.True or false: a comb is not needed for the yeast balloon. (a) True (b) False
11. 11.🍞 Which of these is something yeast needs? (a) sunlight (b) a magnet (c) warm water (d) vinegar
12. 12.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
13. 13.⚖️ 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 measure it (b) we keep it the same (c) we change it
14. 14.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is what we measure. (a) True (b) False
15. 15.True or false: a magnet is needed for the yeast balloon. (a) False (b) True
16. 16.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a balloon (c) dry yeast (d) a comb
17. 17.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to make bread rise (c) to clean floors (d) to colour rice
18. 18.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a magnet (c) a paper clip (d) a balloon
19. 19.True or false: warm water is needed for the yeast balloon. (a) False (b) True
20. 20.⚖️ 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 keep it the same (c) we measure it
21. 21.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) steam (c) smoke (d) carbon dioxide gas
22. 22.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) dry yeast (c) warm water (d) a comb
23. 23.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
24. 24.🍞 Which of these is something yeast does not need? (a) vinegar (b) sugar (c) warm water (d) time
25. 25.⚖️ 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 keep it the same (c) we measure it
26. 26.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
27. 27.📘 What is yeast? (a) a kind of salt (b) a kind of stone (c) a tiny living fungus (d) a kind of sugar
28. 28.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it bursts at once (c) it turns yellow (d) it grows much faster
29. 29.True or false: a balloon is needed for the yeast balloon. (a) False (b) True
30. 30.🔍 Which is the odd one out? (a) vinegar (b) sunlight (c) warm water (d) a magnet
31. 31.True or false: a mirror is not needed for the yeast balloon. (a) True (b) False
32. 32.⚖️ 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 change it (b) we keep it the same (c) we measure it
33. 33.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
34. 34.True or false: sugar is needed for the yeast balloon. (a) False (b) True
35. 35.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) sugar (c) a battery cell (d) dry yeast
36. 36.True or false: vinegar is something yeast needs. (a) False (b) True
37. 37.⚖️ 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) size of the balloon
38. 38.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
39. 39.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold slows yeast down (c) cold kills sugar (d) cold water is heavy
40. 40.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed

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