Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 455 · 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) vinegar (b) time (c) sugar (d) warm water
2. 2.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
3. 3.🍞 Which of these is something yeast needs? (a) warm water (b) sunlight (c) vinegar (d) salt
4. 4.🔍 Which is the odd one out? (a) sunlight (b) a magnet (c) salt (d) time
5. 5.🔍 Which is the odd one out? (a) sugar (b) sunlight (c) warm water (d) time
6. 6.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
7. 7.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) sugar (d) a comb
8. 8.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) very salty (d) warm, not hot
9. 9.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) steam (c) carbon dioxide gas (d) air from outside
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 water”? (a) we measure it (b) we keep it the same (c) we change it
11. 11.⚖️ 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
12. 12.⚖️ 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) size of the balloon (c) the water temperature
13. 13.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) time (d) a magnet
14. 14.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) the yeast is killed (c) it grows faster (d) it turns to sugar
15. 15.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) a mirror (c) turmeric powder (d) a magnet
16. 16.🧺 Which of these is not needed for the yeast balloon? (a) a paper clip (b) a balloon (c) sugar (d) dry yeast
17. 17.⚖️ 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 change it (c) we measure it
18. 18.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) put it in your mouth (c) keep it for a month (d) throw it at a wall
19. 19.True or false: time is something yeast needs. (a) False (b) True
20. 20.🍞 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
21. 21.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
22. 22.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to wash dishes (c) to colour rice (d) to make bread rise
23. 23.🧺 Which of these is not needed for the yeast balloon? (a) a mirror (b) a small bottle (c) a balloon (d) sugar
24. 24.⚖️ 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) size of the balloon (b) the same bottles (c) the amount of water (d) the water temperature
25. 25.🍞 Which of these is something yeast needs? (a) time (b) salt (c) sunlight (d) vinegar
26. 26.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
27. 27.⚖️ 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 keep it the same (b) we measure it (c) we change it
28. 28.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
29. 29.🔍 Which is the odd one out? (a) sugar (b) salt (c) vinegar (d) a magnet
30. 30.📘 What is yeast? (a) a tiny living fungus (b) a kind of sugar (c) a kind of stone (d) a kind of salt
31. 31.True or false: vinegar is something yeast does not need. (a) True (b) False
32. 32.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
33. 33.⚖️ 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 change it (b) we measure it (c) we keep it the same
34. 34.⚖️ 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 change it (b) we keep it the same (c) we measure it
35. 35.True or false: warm water is something yeast does not need. (a) False (b) True
36. 36.🔮 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 smaller (d) the balloon is bigger
37. 37.True or false: sugar is something yeast does not need. (a) False (b) True
38. 38.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) dry yeast (c) turmeric powder (d) a balloon
39. 39.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it turns yellow (c) it grows much faster (d) it grows very little
40. 40.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a magnet (c) dry yeast (d) turmeric powder

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