Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 195 · 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.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) put it in your mouth (c) throw it at a wall (d) keep it for a month
2. 2.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the water temperature (b) the amount of water (c) size of the balloon
3. 3.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
4. 4.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) sugar (c) a small bottle (d) a magnet
5. 5.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it turns to sugar (c) it glows (d) it grows faster
6. 6.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a small bottle (c) turmeric powder (d) dry yeast
7. 7.⚖️ 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 measure it (b) we change it (c) we keep it the same
8. 8.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) sugar (c) a small bottle (d) warm water
9. 9.True or false: salt is something yeast needs. (a) True (b) False
10. 10.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
11. 11.🧺 Which of these is needed for the yeast balloon? (a) dry yeast (b) a battery cell (c) turmeric powder (d) a magnet
12. 12.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a small bottle (c) turmeric powder (d) a paper clip
13. 13.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) carbon dioxide gas (c) air from outside (d) steam
14. 14.True or false: a small bottle is needed for the yeast balloon. (a) True (b) False
15. 15.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) the balloon is bigger (c) it turns to bread (d) it shrinks to nothing
16. 16.🔍 Which is the odd one out? (a) a magnet (b) sunlight (c) sugar (d) vinegar
17. 17.⚖️ 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 keep it the same (c) we change it
18. 18.📘 What is yeast? (a) a kind of sugar (b) a kind of stone (c) a kind of salt (d) a tiny living fungus
19. 19.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
20. 20.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
21. 21.🛟 The water for the yeast should be ___. (a) warm, not hot (b) boiling hot (c) ice cold (d) very salty
22. 22.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
23. 23.⚖️ 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
24. 24.🍞 Which of these is something yeast needs? (a) sugar (b) salt (c) vinegar (d) a magnet
25. 25.🍞 Which of these is something yeast needs? (a) warm water (b) sunlight (c) a magnet (d) salt
26. 26.⚖️ 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) the water temperature (c) the amount of sugar (d) size of the balloon
27. 27.🔍 Which is the odd one out? (a) time (b) sugar (c) vinegar (d) warm water
28. 28.🔍 Which is the odd one out? (a) warm water (b) vinegar (c) salt (d) a magnet
29. 29.True or false: a magnet is something yeast does not need. (a) False (b) True
30. 30.⚖️ 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 change it (c) we keep it the same
31. 31.⚖️ 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
32. 32.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
33. 33.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold water is heavy (c) cold makes it pink (d) cold slows yeast down
34. 34.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
35. 35.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
36. 36.True or false: a comb is not needed for the yeast balloon. (a) True (b) False
37. 37.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a mirror (c) a balloon (d) dry yeast
38. 38.🔍 Which is the odd one out? (a) warm water (b) time (c) a magnet (d) sugar
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 mirror (c) a balloon (d) a small bottle

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