Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 620 · 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) a magnet (b) sugar (c) salt (d) sunlight
2. 2.🍞 Which of these is something yeast needs? (a) vinegar (b) warm water (c) sunlight (d) a magnet
3. 3.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
4. 4.⚖️ 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 keep it the same (b) we change it (c) we measure it
5. 5.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) warm water (c) a paper clip (d) sugar
6. 6.🍞 Which of these is something yeast needs? (a) salt (b) sugar (c) a magnet (d) vinegar
7. 7.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the same bottles (b) the water temperature (c) size of the balloon
8. 8.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
9. 9.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to colour rice (c) to wash dishes (d) to make bread rise
10. 10.⚖️ 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 same bottles (c) the amount of sugar (d) size of the balloon
11. 11.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it glows (c) it turns to sugar (d) the yeast is killed
12. 12.True or false: time is something yeast does not need. (a) True (b) False
13. 13.True or false: sugar is something yeast does not need. (a) True (b) False
14. 14.True or false: salt is something yeast does not need. (a) True (b) False
15. 15.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a balloon (c) a paper clip (d) warm water
16. 16.🛟 The water for the yeast should be ___. (a) boiling hot (b) very salty (c) warm, not hot (d) ice cold
17. 17.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
18. 18.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a magnet (c) sugar (d) a comb
19. 19.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold kills sugar (c) cold water is heavy (d) cold slows yeast down
20. 20.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) turmeric powder (b) a balloon (c) sugar (d) a small bottle
21. 21.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
22. 22.⚖️ 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 yeast (b) the amount of water (c) the water temperature (d) the amount of sugar
23. 23.True or false: a battery cell is needed for the yeast balloon. (a) False (b) True
24. 24.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
25. 25.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
26. 26.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is bigger (c) it turns to bread (d) the balloon is smaller
27. 27.🔍 Which is the odd one out? (a) salt (b) a magnet (c) time (d) vinegar
28. 28.🔍 Which is the odd one out? (a) sugar (b) warm water (c) salt (d) time
29. 29.⚖️ 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) True (b) False
30. 30.🔍 Which is the odd one out? (a) time (b) warm water (c) sugar (d) sunlight
31. 31.🍞 Which of these is something yeast does not need? (a) warm water (b) a magnet (c) time (d) sugar
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) size of the balloon (c) the amount of yeast
33. 33.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a balloon (c) warm water (d) a battery cell
34. 34.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) smoke (c) carbon dioxide gas (d) air from outside
35. 35.⚖️ 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
36. 36.True or false: warm water is something yeast does not need. (a) True (b) False
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 yeast”? (a) we keep it the same (b) we measure it (c) we change it
38. 38.True or false: a magnet is not needed for the yeast balloon. (a) True (b) False
39. 39.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is kept the same. (a) True (b) False
40. 40.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed

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