Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 644 · 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.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) turmeric powder (c) a balloon (d) dry yeast
2. 2.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
3. 3.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it bursts at once (c) it turns yellow (d) it grows much faster
4. 4.True or false: warm water is something yeast needs. (a) False (b) True
5. 5.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a balloon (c) dry yeast (d) a battery cell
6. 6.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
7. 7.⚖️ 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 water (b) the amount of yeast (c) size of the balloon (d) the water temperature
8. 8.⚖️ 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 keep it the same (c) we measure it
9. 9.⚖️ 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 yeast (b) the same bottles (c) the amount of water (d) size of the balloon
10. 10.🛟 The water for the yeast should be ___. (a) very salty (b) ice cold (c) warm, not hot (d) boiling hot
11. 11.🔍 Which is the odd one out? (a) vinegar (b) a magnet (c) salt (d) sugar
12. 12.🔍 Which is the odd one out? (a) sunlight (b) a magnet (c) vinegar (d) warm water
13. 13.True or false: a comb is needed for the yeast balloon. (a) False (b) True
14. 14.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
15. 15.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
16. 16.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
17. 17.⚖️ 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
18. 18.True or false: sunlight is something yeast does not need. (a) True (b) False
19. 19.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) warm water (d) a mirror
20. 20.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) carbon dioxide gas (c) steam (d) air from outside
21. 21.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
22. 22.🔍 Which is the odd one out? (a) salt (b) warm water (c) time (d) sugar
23. 23.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) warm water (c) a small bottle (d) a paper clip
24. 24.True or false: a paper clip is not needed for the yeast balloon. (a) False (b) True
25. 25.⚖️ 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 same bottles (c) the water temperature
26. 26.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) a magnet (c) a battery cell (d) turmeric powder
27. 27.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold makes it pink (c) cold kills sugar (d) cold water is heavy
28. 28.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
29. 29.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to make it heavy (c) it is food for yeast (d) to colour it
30. 30.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is what we measure. (a) True (b) False
31. 31.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
32. 32.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
33. 33.🍞 Which of these is something yeast needs? (a) sunlight (b) vinegar (c) salt (d) warm water
34. 34.True or false: warm water is something yeast does not need. (a) False (b) True
35. 35.True or false: a small bottle is needed for the yeast balloon. (a) False (b) True
36. 36.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) turmeric powder (c) dry yeast (d) sugar
37. 37.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) the balloon is smaller (c) it shrinks to nothing (d) it turns to bread
38. 38.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to make bread rise (c) to wash dishes (d) to clean floors
39. 39.⚖️ 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
40. 40.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it turns to sugar (c) it glows (d) the yeast is killed

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