Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 220 · 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.⚖️ 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 measure it (c) we keep it the same
2. 2.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a comb (c) warm water (d) sugar
3. 3.🔍 Which is the odd one out? (a) warm water (b) vinegar (c) a magnet (d) sunlight
4. 4.🛟 The water for the yeast should be ___. (a) boiling hot (b) warm, not hot (c) very salty (d) ice cold
5. 5.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold kills sugar (c) cold slows yeast down (d) cold makes it pink
6. 6.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it grows faster (c) it turns to sugar (d) it glows
7. 7.True or false: warm water is something yeast needs. (a) True (b) False
8. 8.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
9. 9.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to make it sweet (c) to colour it (d) to make it heavy
10. 10.True or false: warm water is needed for the yeast balloon. (a) True (b) False
11. 11.True or false: a small bottle is needed for the yeast balloon. (a) True (b) False
12. 12.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) pour it down the sink (c) keep it for a month (d) throw it at a wall
13. 13.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to colour rice (c) to wash dishes (d) to clean floors
14. 14.🔍 Which is the odd one out? (a) warm water (b) sunlight (c) time (d) sugar
15. 15.True or false: a balloon is not needed for the yeast balloon. (a) False (b) True
16. 16.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a paper clip (c) sugar (d) a balloon
17. 17.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
18. 18.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
19. 19.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) sugar (d) vinegar
20. 20.⚖️ 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 water temperature (c) the amount of sugar
21. 21.⚖️ 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 measure it (b) we change it (c) we keep it the same
22. 22.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) turmeric powder (d) sugar
23. 23.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a mirror (c) a balloon (d) a small bottle
24. 24.True or false: sugar is needed for the yeast balloon. (a) False (b) True
25. 25.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
26. 26.🔍 Which is the odd one out? (a) a magnet (b) vinegar (c) time (d) salt
27. 27.True or false: time is something yeast needs. (a) False (b) True
28. 28.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
29. 29.True or false: time is something yeast does not need. (a) True (b) False
30. 30.True or false: a comb is needed for the yeast balloon. (a) False (b) True
31. 31.⚖️ 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 sugar (b) the water temperature (c) the amount of yeast (d) the amount of water
32. 32.🔍 Which is the odd one out? (a) warm water (b) sugar (c) a magnet (d) time
33. 33.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) air from outside (c) smoke (d) carbon dioxide gas
34. 34.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
35. 35.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) a mirror (c) a paper clip (d) a battery cell
36. 36.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a small bottle (c) a battery cell (d) a magnet
37. 37.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
38. 38.⚖️ 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 keep it the same (b) we change it (c) we measure it
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 change it (b) we keep it the same (c) we measure it
40. 40.🍞 Which of these is something yeast needs? (a) sunlight (b) time (c) salt (d) a magnet

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