Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 402 · 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 sugar for the yeast balloon? (a) needed (b) not needed
2. 2.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
3. 3.⚖️ 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
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) dry yeast (c) a mirror (d) a balloon
5. 5.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) a balloon (d) a comb
6. 6.🧺 Do we need a paper clip 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 small bottle (b) dry yeast (c) warm water (d) turmeric powder
8. 8.🔍 Which is the odd one out? (a) time (b) sugar (c) warm water (d) vinegar
9. 9.True or false: a battery cell is needed for the yeast balloon. (a) False (b) True
10. 10.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it glows (c) it grows faster (d) it turns to sugar
11. 11.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold water is heavy (c) cold kills sugar (d) cold slows yeast down
12. 12.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a comb (c) sugar (d) a mirror
13. 13.🛟 The water for the yeast should be ___. (a) very salty (b) warm, not hot (c) boiling hot (d) ice cold
14. 14.🍞 Which of these is something yeast needs? (a) time (b) a magnet (c) vinegar (d) salt
15. 15.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
16. 16.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) keep it for a month (c) throw it at a wall (d) put it in your mouth
17. 17.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
18. 18.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a battery cell (c) sugar (d) dry yeast
19. 19.🔍 Which is the odd one out? (a) warm water (b) salt (c) sunlight (d) a magnet
20. 20.🍞 Which of these is something yeast needs? (a) a magnet (b) sunlight (c) sugar (d) salt
21. 21.🔍 Which is the odd one out? (a) sugar (b) time (c) salt (d) warm water
22. 22.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a small bottle (c) warm water (d) turmeric powder
23. 23.⚖️ 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 same bottles (b) the amount of water (c) the water temperature (d) the amount of yeast
24. 24.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
25. 25.🔍 Which is the odd one out? (a) sugar (b) warm water (c) time (d) a magnet
26. 26.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
27. 27.🧺 Which of these is not needed for the yeast balloon? (a) a comb (b) dry yeast (c) sugar (d) a balloon
28. 28.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
29. 29.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) air from outside (c) steam (d) smoke
30. 30.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to wash dishes (c) to colour rice (d) to clean floors
31. 31.⚖️ 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 measure it (b) we change it (c) we keep it the same
32. 32.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is what we measure. (a) False (b) True
33. 33.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is what we measure. (a) False (b) True
34. 34.🔍 Which is the odd one out? (a) sunlight (b) a magnet (c) sugar (d) vinegar
35. 35.True or false: sugar is something yeast does not need. (a) False (b) True
36. 36.True or false: turmeric powder is needed for the yeast balloon. (a) False (b) True
37. 37.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) warm water (c) a battery cell (d) dry yeast
38. 38.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is the one thing we change. (a) False (b) True
39. 39.⚖️ 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 measure it (b) we change it (c) we keep it the same
40. 40.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) warm water (d) sunlight

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