Yeast Balloon Experiment Worksheet

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

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