Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 74 · 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? True or false: the amount of yeast is what we measure. (a) True (b) False
2. 2.True or false: a magnet is something yeast does not need. (a) False (b) True
3. 3.⚖️ 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 change it (b) we keep it the same (c) we measure it
4. 4.🍞 Which of these is something yeast needs? (a) sunlight (b) sugar (c) a magnet (d) salt
5. 5.🍞 Which of these is something yeast does not need? (a) warm water (b) a magnet (c) sugar (d) time
6. 6.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) size of the balloon (b) the same bottles (c) the amount of sugar (d) the water temperature
7. 7.🛟 The water for the yeast should be ___. (a) ice cold (b) boiling hot (c) warm, not hot (d) very salty
8. 8.🔍 Which is the odd one out? (a) time (b) sugar (c) warm water (d) salt
9. 9.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
10. 10.True or false: warm water is something yeast does not need. (a) True (b) False
11. 11.🧺 Which of these is not needed for the yeast balloon? (a) turmeric powder (b) warm water (c) a small bottle (d) sugar
12. 12.🔍 Which is the odd one out? (a) vinegar (b) warm water (c) a magnet (d) sunlight
13. 13.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) throw it at a wall (c) pour it down the sink (d) put it in your mouth
14. 14.True or false: a comb is needed for the yeast balloon. (a) True (b) False
15. 15.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold slows yeast down (c) cold makes it pink (d) cold kills sugar
16. 16.🔍 Which is the odd one out? (a) sugar (b) time (c) warm water (d) sunlight
17. 17.True or false: a magnet is something yeast needs. (a) True (b) False
18. 18.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
19. 19.🍞 Which of these is something yeast needs? (a) time (b) sunlight (c) salt (d) a magnet
20. 20.⚖️ 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 amount of sugar (c) the water temperature (d) the same bottles
21. 21.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a mirror (c) sugar (d) dry yeast
22. 22.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows very little (c) it bursts at once (d) it grows much faster
23. 23.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
24. 24.⚖️ 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 keep it the same (b) we change it (c) we measure it
25. 25.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a small bottle (c) a magnet (d) dry yeast
26. 26.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
27. 27.⚖️ 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) True (b) False
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) dry yeast (c) warm water (d) sugar
29. 29.⚖️ 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
30. 30.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to make bread rise (c) to wash dishes (d) to clean floors
31. 31.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) steam (c) air from outside (d) carbon dioxide gas
32. 32.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
33. 33.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a battery cell (c) warm water (d) dry yeast
34. 34.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
35. 35.True or false: dry yeast is needed for the yeast balloon. (a) False (b) True
36. 36.🔍 Which is the odd one out? (a) sugar (b) time (c) warm water (d) vinegar
37. 37.🔮 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
38. 38.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
39. 39.🧺 Which of these is needed for the yeast balloon? (a) dry yeast (b) a mirror (c) a battery cell (d) a magnet
40. 40.True or false: a small bottle is needed for the yeast balloon. (a) False (b) True

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