Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 532 · 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) sunlight (d) a magnet
2. 2.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
3. 3.True or false: a battery cell is needed for the yeast balloon. (a) True (b) False
4. 4.True or false: dry yeast is needed for the yeast balloon. (a) False (b) True
5. 5.True or false: a comb is not needed for the yeast balloon. (a) True (b) False
6. 6.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a balloon (c) a paper clip (d) a battery cell
7. 7.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) the yeast is killed (c) it grows faster (d) it turns to sugar
8. 8.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is what we measure. (a) True (b) False
9. 9.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to wash dishes (c) to colour rice (d) to make bread rise
10. 10.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
11. 11.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
12. 12.⚖️ 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
13. 13.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is what we measure. (a) True (b) False
14. 14.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold kills sugar (c) cold makes it pink (d) cold slows yeast down
15. 15.🛟 The water for the yeast should be ___. (a) warm, not hot (b) very salty (c) ice cold (d) boiling hot
16. 16.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) it shrinks to nothing (c) the balloon is bigger (d) it turns to bread
17. 17.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
18. 18.⚖️ 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 same bottles (c) the amount of yeast (d) size of the balloon
19. 19.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) keep it for a month (c) pour it down the sink (d) put it in your mouth
20. 20.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
21. 21.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is kept the same. (a) False (b) True
22. 22.⚖️ 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
23. 23.⚖️ 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 amount of yeast (c) the water temperature
24. 24.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) dry yeast (c) a balloon (d) a magnet
25. 25.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) sugar (d) vinegar
26. 26.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
27. 27.🔍 Which is the odd one out? (a) sugar (b) sunlight (c) time (d) warm water
28. 28.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) sugar (d) sunlight
29. 29.⚖️ 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) False (b) True
30. 30.🍞 Which of these is something yeast needs? (a) sunlight (b) time (c) a magnet (d) salt
31. 31.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a small bottle (c) a battery cell (d) a paper clip
32. 32.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
33. 33.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it grows much faster (c) it turns yellow (d) it bursts at once
34. 34.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “size of the balloon”? (a) we change it (b) we measure it (c) we keep it the same
35. 35.🔍 Which is the odd one out? (a) sugar (b) time (c) warm water (d) salt
36. 36.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to colour it (c) it is food for yeast (d) to make it heavy
37. 37.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) smoke (c) air from outside (d) carbon dioxide gas
38. 38.🔍 Which is the odd one out? (a) warm water (b) time (c) sugar (d) a magnet
39. 39.🍞 Which of these is something yeast does not need? (a) warm water (b) salt (c) sugar (d) time
40. 40.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) turmeric powder (b) sugar (c) a small bottle (d) a balloon

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