Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 919 · 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 what we measure? (a) the amount of sugar (b) the amount of yeast (c) the water temperature (d) size of the balloon
2. 2.🔍 Which is the odd one out? (a) warm water (b) vinegar (c) time (d) sugar
3. 3.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
4. 4.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold water is heavy (c) cold kills sugar (d) cold slows yeast down
5. 5.True or false: a magnet is something yeast needs. (a) True (b) False
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 measure it (b) we keep it the same (c) we change it
7. 7.⚖️ 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 keep it the same (c) we change it
8. 8.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) steam (c) air from outside (d) carbon dioxide gas
9. 9.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
10. 10.⚖️ 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 yeast (c) size of the balloon
11. 11.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows very little (c) it turns yellow (d) it grows much faster
12. 12.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
13. 13.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) throw it at a wall (c) keep it for a month (d) put it in your mouth
14. 14.⚖️ 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 measure it (c) we keep it the same
15. 15.True or false: a paper clip is needed for the yeast balloon. (a) True (b) False
16. 16.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) warm water (c) dry yeast (d) a magnet
17. 17.🔍 Which is the odd one out? (a) warm water (b) a magnet (c) salt (d) sunlight
18. 18.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
19. 19.🛟 The water for the yeast should be ___. (a) very salty (b) boiling hot (c) warm, not hot (d) ice cold
20. 20.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
21. 21.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
22. 22.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
23. 23.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
24. 24.🍞 Which of these is something yeast needs? (a) salt (b) time (c) sunlight (d) vinegar
25. 25.🔍 Which is the odd one out? (a) salt (b) sugar (c) warm water (d) time
26. 26.⚖️ 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 amount of yeast (b) the same bottles (c) the amount of water (d) the water temperature
27. 27.True or false: a magnet is something yeast does not need. (a) True (b) False
28. 28.🍞 Which of these is something yeast does not need? (a) sugar (b) salt (c) time (d) warm water
29. 29.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
30. 30.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) sugar (c) a mirror (d) warm water
31. 31.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) it turns to bread (c) it shrinks to nothing (d) the balloon is bigger
32. 32.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a balloon (c) warm water (d) a comb
33. 33.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) dry yeast (c) turmeric powder (d) a paper clip
34. 34.🍞 Which of these is something yeast needs? (a) vinegar (b) salt (c) a magnet (d) warm water
35. 35.🔮 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
36. 36.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to colour rice (c) to wash dishes (d) to make bread rise
37. 37.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) dry yeast (c) a balloon (d) a paper clip
38. 38.True or false: a battery cell is needed for the yeast balloon. (a) False (b) True
39. 39.True or false: vinegar is something yeast does not need. (a) True (b) False
40. 40.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) turmeric powder (c) a paper clip (d) a small bottle

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