Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 788 · 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) warm water (c) dry yeast (d) turmeric powder
2. 2.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is smaller (c) it shrinks to nothing (d) the balloon is bigger
3. 3.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold makes it pink (c) cold slows yeast down (d) cold kills sugar
4. 4.True or false: a magnet is something yeast needs. (a) False (b) True
5. 5.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) smoke (c) carbon dioxide gas (d) steam
6. 6.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
7. 7.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a battery cell (b) dry yeast (c) a small bottle (d) a balloon
8. 8.⚖️ 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 change it (b) we measure it (c) we keep it the same
9. 9.🔍 Which is the odd one out? (a) vinegar (b) salt (c) time (d) sunlight
10. 10.True or false: a mirror is needed for the yeast balloon. (a) False (b) True
11. 11.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is kept the same. (a) True (b) False
12. 12.⚖️ 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) True (b) False
13. 13.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to wash dishes (c) to make bread rise (d) to clean floors
14. 14.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it bursts at once (c) it turns yellow (d) it grows very little
15. 15.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a magnet (c) a paper clip (d) sugar
16. 16.🔍 Which is the odd one out? (a) time (b) sugar (c) warm water (d) sunlight
17. 17.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the same bottles (b) the water temperature (c) size of the balloon (d) the amount of water
18. 18.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a balloon (c) warm water (d) a paper clip
19. 19.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
20. 20.⚖️ 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 sugar (b) the amount of water (c) the water temperature (d) size of the balloon
21. 21.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
22. 22.True or false: a magnet is not needed for the yeast balloon. (a) True (b) False
23. 23.True or false: a battery cell is needed for the yeast balloon. (a) True (b) False
24. 24.True or false: sugar is needed for the yeast balloon. (a) False (b) True
25. 25.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is the one thing we change. (a) False (b) True
26. 26.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
27. 27.⚖️ 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
28. 28.⚖️ 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 change it (b) we keep it the same (c) we measure it
29. 29.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
30. 30.True or false: warm water is something yeast does not need. (a) True (b) False
31. 31.🔍 Which is the odd one out? (a) salt (b) a magnet (c) sunlight (d) warm water
32. 32.🍞 Which of these is something yeast does not need? (a) sugar (b) sunlight (c) warm water (d) time
33. 33.🔍 Which is the odd one out? (a) sugar (b) time (c) warm water (d) vinegar
34. 34.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
35. 35.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
36. 36.🍞 Which of these is something yeast needs? (a) sunlight (b) salt (c) vinegar (d) time
37. 37.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) keep it for a month (c) pour it down the sink (d) throw it at a wall
38. 38.🛟 The water for the yeast should be ___. (a) boiling hot (b) warm, not hot (c) very salty (d) ice cold
39. 39.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
40. 40.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it

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