Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 823 · 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.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold makes it pink (c) cold water is heavy (d) cold slows yeast down
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.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) sugar (c) dry yeast (d) a small bottle
4. 4.⚖️ 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) size of the balloon (c) the amount of sugar (d) the amount of water
5. 5.🍞 Which of these is something yeast needs? (a) salt (b) vinegar (c) sunlight (d) warm water
6. 6.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
7. 7.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) sunlight (d) sugar
8. 8.🧺 Which of these is needed for the yeast balloon? (a) dry yeast (b) a magnet (c) a mirror (d) a battery cell
9. 9.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to colour rice (c) to wash dishes (d) to clean floors
10. 10.🧺 Which of these is needed for the yeast balloon? (a) a small bottle (b) a magnet (c) a battery cell (d) turmeric powder
11. 11.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
12. 12.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
13. 13.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) a paper clip (d) a small bottle
14. 14.🔍 Which is the odd one out? (a) salt (b) vinegar (c) sunlight (d) time
15. 15.True or false: a battery cell is needed for the yeast balloon. (a) True (b) False
16. 16.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to colour it (c) to make it heavy (d) it is food for yeast
17. 17.⚖️ 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 keep it the same (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 amount of water is the one thing we change. (a) True (b) False
19. 19.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) steam (c) air from outside (d) smoke
20. 20.True or false: sunlight is something yeast needs. (a) False (b) True
21. 21.True or false: time is something yeast does not need. (a) True (b) False
22. 22.⚖️ 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 yeast (b) the amount of sugar (c) the same bottles (d) the water temperature
23. 23.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) warm water (d) a battery cell
24. 24.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
25. 25.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) a comb (d) a balloon
26. 26.🔍 Which is the odd one out? (a) salt (b) warm water (c) a magnet (d) vinegar
27. 27.⚖️ 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
28. 28.⚖️ 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
29. 29.🛟 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
30. 30.🛟 The water for the yeast should be ___. (a) very salty (b) warm, not hot (c) ice cold (d) boiling hot
31. 31.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
32. 32.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) sugar (c) warm water (d) a small bottle
33. 33.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
34. 34.🔍 Which is the odd one out? (a) sunlight (b) sugar (c) salt (d) a magnet
35. 35.⚖️ 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 keep it the same (c) we measure it
36. 36.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
37. 37.True or false: a mirror is needed for the yeast balloon. (a) True (b) False
38. 38.🍞 Which of these is something yeast does not need? (a) sugar (b) salt (c) time (d) warm water
39. 39.⚖️ 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 keep it the same (c) we change it
40. 40.True or false: salt is something yeast does not need. (a) False (b) True

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