Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 451 · 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.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) warm water (d) a paper clip
2. 2.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) time (d) a magnet
3. 3.🍞 Which of these is something yeast needs? (a) a magnet (b) salt (c) vinegar (d) time
4. 4.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) air from outside (c) carbon dioxide gas (d) smoke
5. 5.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) turmeric powder (c) sugar (d) a mirror
6. 6.True or false: a magnet is needed for the yeast balloon. (a) False (b) True
7. 7.🔮 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
8. 8.🔍 Which is the odd one out? (a) warm water (b) vinegar (c) salt (d) a magnet
9. 9.⚖️ 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 measure it (b) we keep it the same (c) we change it
10. 10.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
11. 11.🔍 Which is the odd one out? (a) salt (b) sugar (c) warm water (d) time
12. 12.True or false: salt is something yeast does not need. (a) True (b) False
13. 13.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) it turns to bread (c) the balloon is bigger (d) the balloon is smaller
14. 14.True or false: sugar is needed for the yeast balloon. (a) False (b) True
15. 15.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is kept the same. (a) True (b) False
16. 16.True or false: a balloon is needed for the yeast balloon. (a) True (b) False
17. 17.⚖️ 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 measure it (c) we change it
18. 18.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
19. 19.⚖️ 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) False (b) True
20. 20.🍞 Which of these is something yeast does not need? (a) salt (b) warm water (c) sugar (d) time
21. 21.⚖️ 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) size of the balloon (c) the amount of sugar (d) the water temperature
22. 22.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold makes it pink (c) cold kills sugar (d) cold water is heavy
23. 23.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to wash dishes (c) to clean floors (d) to make bread rise
24. 24.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
25. 25.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) a balloon (d) turmeric powder
26. 26.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it turns yellow (c) it grows much faster (d) it grows very little
27. 27.🔍 Which is the odd one out? (a) a magnet (b) time (c) sunlight (d) salt
28. 28.🍞 Which of these is something yeast needs? (a) sunlight (b) sugar (c) a magnet (d) salt
29. 29.True or false: sunlight is something yeast does not need. (a) False (b) True
30. 30.🛟 The water for the yeast should be ___. (a) ice cold (b) very salty (c) boiling hot (d) warm, not hot
31. 31.⚖️ 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
32. 32.True or false: a magnet is something yeast needs. (a) False (b) True
33. 33.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
34. 34.🔍 Which is the odd one out? (a) warm water (b) vinegar (c) sugar (d) time
35. 35.True or false: sugar is something yeast needs. (a) True (b) False
36. 36.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
37. 37.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is what we measure. (a) False (b) True
38. 38.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
39. 39.⚖️ 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
40. 40.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a small bottle (c) a balloon (d) a mirror

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