Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 359 · 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.🔍 Which is the odd one out? (a) warm water (b) salt (c) a magnet (d) vinegar
2. 2.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
3. 3.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
4. 4.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a comb (c) a balloon (d) warm water
5. 5.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) a small bottle (d) a battery cell
6. 6.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) size of the balloon (b) the same bottles (c) the water temperature
7. 7.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of sugar”? (a) we measure it (b) we change it (c) we keep it the same
8. 8.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to clean floors (c) to make bread rise (d) to wash dishes
9. 9.⚖️ 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
10. 10.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
11. 11.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
12. 12.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it grows very little (c) it turns yellow (d) it bursts at once
13. 13.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is what we measure. (a) False (b) True
14. 14.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a comb (c) sugar (d) warm water
15. 15.True or false: time is something yeast needs. (a) False (b) True
16. 16.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
17. 17.🔍 Which is the odd one out? (a) vinegar (b) sunlight (c) salt (d) sugar
18. 18.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) warm water (c) dry yeast (d) a paper clip
19. 19.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the amount of sugar (b) size of the balloon (c) the water temperature
20. 20.🔍 Which is the odd one out? (a) a magnet (b) sunlight (c) vinegar (d) time
21. 21.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
22. 22.True or false: salt is something yeast does not need. (a) False (b) True
23. 23.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
24. 24.⚖️ 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 yeast (b) the amount of water (c) size of the balloon (d) the amount of sugar
25. 25.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
26. 26.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) turmeric powder (c) a balloon (d) a comb
27. 27.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) sugar (c) a mirror (d) warm water
28. 28.🛟 The water for the yeast should be ___. (a) very salty (b) boiling hot (c) warm, not hot (d) ice cold
29. 29.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) salt (d) warm water
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 kept the same. (a) False (b) True
31. 31.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) the yeast is killed (c) it turns to sugar (d) it grows faster
32. 32.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
33. 33.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) pour it down the sink (c) put it in your mouth (d) throw it at a wall
34. 34.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold water is heavy (c) cold slows yeast down (d) cold makes it pink
35. 35.🧺 Which of these is not needed for the yeast balloon? (a) turmeric powder (b) warm water (c) dry yeast (d) a balloon
36. 36.True or false: warm water is needed for the yeast balloon. (a) False (b) True
37. 37.⚖️ 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) True (b) False
38. 38.⚖️ 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 water (b) the amount of yeast (c) the amount of sugar (d) the water temperature
39. 39.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is the one thing we change. (a) True (b) False
40. 40.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) air from outside (c) smoke (d) carbon dioxide gas

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