Yeast Balloon Experiment Worksheet

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

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