Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 728 · 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) salt (b) sunlight (c) vinegar (d) warm water
2. 2.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) warm water (c) a magnet (d) sugar
3. 3.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
4. 4.🛟 The water for the yeast should be ___. (a) boiling hot (b) very salty (c) ice cold (d) warm, not hot
5. 5.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) a small bottle (d) a mirror
6. 6.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a battery cell (c) dry yeast (d) sugar
7. 7.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
8. 8.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) put it in your mouth (c) keep it for a month (d) pour it down the sink
9. 9.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
10. 10.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
11. 11.🔍 Which is the odd one out? (a) time (b) sunlight (c) sugar (d) warm water
12. 12.⚖️ 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 keep it the same (b) we measure it (c) we change it
13. 13.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
14. 14.⚖️ 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 keep it the same (b) we change it (c) we measure it
15. 15.🍞 Which of these is something yeast needs? (a) sugar (b) vinegar (c) salt (d) sunlight
16. 16.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) a magnet (d) warm water
17. 17.⚖️ 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 keep it the same (b) we measure it (c) we change it
18. 18.⚖️ 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) False (b) True
19. 19.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) air from outside (c) smoke (d) steam
20. 20.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows much faster (c) it grows very little (d) it turns yellow
21. 21.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) it turns to bread (c) it shrinks to nothing (d) the balloon is bigger
22. 22.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold water is heavy (c) cold makes it pink (d) cold kills sugar
23. 23.⚖️ 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) True (b) False
24. 24.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to clean floors (c) to wash dishes (d) to make bread rise
25. 25.⚖️ 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 change it (b) we keep it the same (c) we measure it
26. 26.True or false: time is something yeast does not need. (a) True (b) False
27. 27.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a small bottle (c) a magnet (d) a balloon
28. 28.True or false: salt is something yeast needs. (a) True (b) False
29. 29.⚖️ 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
30. 30.🍞 Which of these is something yeast does not need? (a) sunlight (b) time (c) warm water (d) sugar
31. 31.True or false: a magnet is something yeast does not need. (a) False (b) True
32. 32.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the water temperature (b) size of the balloon (c) the amount of yeast
33. 33.True or false: warm water is something yeast does not need. (a) True (b) False
34. 34.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a balloon (c) a small bottle (d) turmeric powder
35. 35.🔍 Which is the odd one out? (a) a magnet (b) sunlight (c) salt (d) time
36. 36.🔍 Which is the odd one out? (a) sugar (b) warm water (c) time (d) salt
37. 37.True or false: vinegar is something yeast does not need. (a) True (b) False
38. 38.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
39. 39.⚖️ 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) size of the balloon (c) the water temperature (d) the amount of yeast
40. 40.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it

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