Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 883 · 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? Which of these is kept the same? (a) the amount of yeast (b) size of the balloon (c) the water temperature
2. 2.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) a battery cell (d) dry yeast
3. 3.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) a mirror (c) a balloon (d) warm water
4. 4.📘 What is yeast? (a) a kind of stone (b) a kind of sugar (c) a tiny living fungus (d) a kind of salt
5. 5.🍞 Which of these is something yeast needs? (a) sunlight (b) salt (c) vinegar (d) sugar
6. 6.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is kept the same. (a) False (b) True
7. 7.⚖️ 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) False (b) True
8. 8.⚖️ 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
9. 9.🔍 Which is the odd one out? (a) time (b) sunlight (c) warm water (d) sugar
10. 10.⚖️ 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 change it (c) we measure it
11. 11.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) pour it down the sink (c) throw it at a wall (d) keep it for a month
12. 12.🔍 Which is the odd one out? (a) sugar (b) time (c) salt (d) warm water
13. 13.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) smoke (c) air from outside (d) steam
14. 14.🔍 Which is the odd one out? (a) time (b) a magnet (c) sugar (d) warm water
15. 15.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) turmeric powder (c) a mirror (d) dry yeast
16. 16.⚖️ 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 keep it the same (c) we measure it
17. 17.⚖️ 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) False (b) True
18. 18.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a balloon (c) warm water (d) turmeric powder
19. 19.🍞 Which of these is something yeast does not need? (a) sunlight (b) warm water (c) sugar (d) time
20. 20.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
21. 21.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) sugar (d) a mirror
22. 22.🔍 Which is the odd one out? (a) sugar (b) vinegar (c) sunlight (d) a magnet
23. 23.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
24. 24.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it turns to sugar (c) the yeast is killed (d) it grows faster
25. 25.True or false: sunlight is something yeast needs. (a) False (b) True
26. 26.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
27. 27.True or false: a small bottle is needed for the yeast balloon. (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 the one thing we change? (a) the same bottles (b) the amount of sugar (c) the water temperature (d) size of the balloon
29. 29.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) a magnet (c) warm water (d) a balloon
30. 30.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
31. 31.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
32. 32.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) it turns to bread (c) the balloon is bigger (d) it shrinks to nothing
33. 33.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
34. 34.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to wash dishes (c) to clean floors (d) to colour rice
35. 35.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
36. 36.⚖️ 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
37. 37.⚖️ 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 measure it (b) we change it (c) we keep it the same
38. 38.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
39. 39.True or false: warm water is something yeast needs. (a) False (b) True
40. 40.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a small bottle (c) a paper clip (d) sugar

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