Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 778 · 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: sugar is something yeast does not need. (a) True (b) False
2. 2.True or false: sugar is something yeast needs. (a) False (b) True
3. 3.🔍 Which is the odd one out? (a) sugar (b) salt (c) vinegar (d) a magnet
4. 4.⚖️ 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
5. 5.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
6. 6.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
7. 7.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) a paper clip (c) a balloon (d) warm water
8. 8.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to clean floors (c) to colour rice (d) to make bread rise
9. 9.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) the yeast is killed (c) it turns to sugar (d) it glows
10. 10.🍞 Which of these is something yeast needs? (a) sunlight (b) time (c) salt (d) vinegar
11. 11.⚖️ 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
12. 12.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) a magnet (d) a balloon
13. 13.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
14. 14.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is smaller (c) the balloon is bigger (d) it shrinks to nothing
15. 15.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold water is heavy (c) cold slows yeast down (d) cold makes it pink
16. 16.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) warm water (c) a small bottle (d) turmeric powder
17. 17.⚖️ 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) False (b) True
18. 18.🍞 Which of these is something yeast needs? (a) sunlight (b) salt (c) vinegar (d) sugar
19. 19.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
20. 20.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) sugar (c) dry yeast (d) a mirror
21. 21.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
22. 22.🛟 The water for the yeast should be ___. (a) ice cold (b) boiling hot (c) very salty (d) warm, not hot
23. 23.⚖️ 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
24. 24.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
25. 25.True or false: salt is something yeast does not need. (a) False (b) True
26. 26.True or false: sunlight is something yeast needs. (a) True (b) False
27. 27.True or false: a comb is needed for the yeast balloon. (a) True (b) False
28. 28.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
29. 29.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) a mirror (d) sugar
30. 30.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) throw it at a wall (c) put it in your mouth (d) pour it down the sink
31. 31.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) turmeric powder (c) a battery cell (d) a magnet
32. 32.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
33. 33.⚖️ 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) True (b) False
34. 34.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) steam (c) carbon dioxide gas (d) smoke
35. 35.⚖️ 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 water temperature (c) the amount of sugar (d) the same bottles
36. 36.🔍 Which is the odd one out? (a) sugar (b) time (c) salt (d) warm water
37. 37.🧺 Which of these is needed for the yeast balloon? (a) dry yeast (b) a battery cell (c) a comb (d) a magnet
38. 38.True or false: a magnet is something yeast needs. (a) False (b) True
39. 39.True or false: a mirror is needed for the yeast balloon. (a) False (b) True
40. 40.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a comb (c) a balloon (d) warm water

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