Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 483 · 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.📘 What is yeast? (a) a kind of sugar (b) a tiny living fungus (c) a kind of stone (d) a kind of salt
2. 2.True or false: time is something yeast needs. (a) False (b) True
3. 3.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
4. 4.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) turmeric powder (c) a magnet (d) dry yeast
5. 5.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it turns yellow (c) it grows very little (d) it bursts at once
6. 6.⚖️ 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 measure it (c) we keep it the same
7. 7.True or false: turmeric powder is needed for the yeast balloon. (a) True (b) False
8. 8.True or false: a comb is not needed for the yeast balloon. (a) False (b) True
9. 9.True or false: a comb is needed for the yeast balloon. (a) True (b) False
10. 10.🧺 Which of these is not needed for the yeast balloon? (a) a battery cell (b) dry yeast (c) a balloon (d) warm water
11. 11.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) warm water (c) sugar (d) turmeric powder
12. 12.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
13. 13.True or false: warm water is something yeast needs. (a) True (b) False
14. 14.🔍 Which is the odd one out? (a) vinegar (b) a magnet (c) warm water (d) sunlight
15. 15.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
16. 16.🔮 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
17. 17.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) steam (c) air from outside (d) carbon dioxide gas
18. 18.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is what we measure. (a) True (b) False
19. 19.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
20. 20.🔍 Which is the odd one out? (a) sunlight (b) vinegar (c) salt (d) sugar
21. 21.⚖️ 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
22. 22.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) it shrinks to nothing (c) it turns to bread (d) the balloon is bigger
23. 23.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) a paper clip (c) dry yeast (d) warm water
24. 24.🍞 Which of these is something yeast needs? (a) sunlight (b) a magnet (c) salt (d) time
25. 25.🔍 Which is the odd one out? (a) sugar (b) warm water (c) time (d) vinegar
26. 26.🧺 Which of these is needed for the yeast balloon? (a) sugar (b) a battery cell (c) a paper clip (d) turmeric powder
27. 27.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a magnet (c) a small bottle (d) dry yeast
28. 28.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
29. 29.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a mirror (c) a balloon (d) turmeric powder
30. 30.⚖️ 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
31. 31.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) keep it for a month (c) throw it at a wall (d) put it in your mouth
32. 32.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) a battery cell (d) warm water
33. 33.⚖️ 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
34. 34.True or false: time is something yeast does not need. (a) True (b) False
35. 35.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) time (d) salt
36. 36.🍞 Which of these is something yeast needs? (a) sugar (b) sunlight (c) salt (d) vinegar
37. 37.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is what we measure. (a) True (b) False
38. 38.🛟 The water for the yeast should be ___. (a) ice cold (b) warm, not hot (c) boiling hot (d) very salty
39. 39.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
40. 40.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) sugar (c) a small bottle (d) a magnet

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