Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 160 · 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.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
2. 2.⚖️ 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 keep it the same (b) we measure it (c) we change it
3. 3.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
4. 4.🛟 The water for the yeast should be ___. (a) boiling hot (b) very salty (c) ice cold (d) warm, not hot
5. 5.⚖️ 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 amount of yeast (c) size of the balloon (d) the water temperature
6. 6.📘 What is yeast? (a) a kind of salt (b) a kind of sugar (c) a tiny living fungus (d) a kind of stone
7. 7.⚖️ 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
8. 8.🔍 Which is the odd one out? (a) salt (b) sugar (c) warm water (d) time
9. 9.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to make bread rise (c) to clean floors (d) to wash dishes
10. 10.⚖️ 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 keep it the same (b) we change it (c) we measure it
11. 11.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) sugar (c) a small bottle (d) a comb
12. 12.🧺 Which of these is needed for the yeast balloon? (a) a small bottle (b) turmeric powder (c) a comb (d) a paper clip
13. 13.True or false: sunlight is something yeast needs. (a) True (b) False
14. 14.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) vinegar (d) time
15. 15.🔍 Which is the odd one out? (a) time (b) a magnet (c) sunlight (d) salt
16. 16.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) warm water (c) a paper clip (d) dry yeast
17. 17.True or false: a magnet is something yeast does not need. (a) True (b) False
18. 18.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) warm water (c) sugar (d) a battery cell
19. 19.🔮 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
20. 20.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
21. 21.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) the balloon is bigger (c) it turns to bread (d) it shrinks to nothing
22. 22.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
23. 23.🔍 Which is the odd one out? (a) salt (b) vinegar (c) warm water (d) sunlight
24. 24.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) put it in your mouth (c) throw it at a wall (d) pour it down the sink
25. 25.🍞 Which of these is something yeast needs? (a) salt (b) sunlight (c) sugar (d) vinegar
26. 26.⚖️ 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
27. 27.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) sugar (c) a mirror (d) dry yeast
28. 28.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
29. 29.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) warm water (d) salt
30. 30.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is the one thing we change. (a) False (b) True
31. 31.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) dry yeast (c) a comb (d) a magnet
32. 32.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) a mirror (d) warm water
33. 33.🔍 Which is the odd one out? (a) sugar (b) vinegar (c) warm water (d) time
34. 34.⚖️ 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 change it (c) we measure it
35. 35.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold makes it pink (c) cold water is heavy (d) cold slows yeast down
36. 36.True or false: a comb is needed for the yeast balloon. (a) False (b) True
37. 37.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a comb (c) warm water (d) a magnet
38. 38.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) steam (c) carbon dioxide gas (d) air from outside
39. 39.True or false: a balloon is needed for the yeast balloon. (a) True (b) False
40. 40.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it turns yellow (c) it grows very little (d) it grows much faster

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