Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 938 · 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.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
2. 2.⚖️ 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 keep it the same (b) we measure it (c) we change it
3. 3.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a balloon (c) a small bottle (d) turmeric powder
4. 4.🍞 Which of these is something yeast needs? (a) time (b) salt (c) sunlight (d) a magnet
5. 5.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
6. 6.🛟 The water for the yeast should be ___. (a) very salty (b) boiling hot (c) ice cold (d) warm, not hot
7. 7.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
8. 8.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) time (d) a magnet
9. 9.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
10. 10.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) carbon dioxide gas (c) steam (d) air from outside
11. 11.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
12. 12.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
13. 13.True or false: warm water is something yeast does not need. (a) True (b) False
14. 14.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it glows (c) it grows faster (d) the yeast is killed
15. 15.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
16. 16.⚖️ 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 water temperature (b) the same bottles (c) the amount of yeast (d) the amount of water
17. 17.🧺 Which of these is needed for the yeast balloon? (a) a small bottle (b) a battery cell (c) a paper clip (d) a magnet
18. 18.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) time (d) sunlight
19. 19.True or false: sunlight is something yeast does not need. (a) False (b) True
20. 20.🔍 Which is the odd one out? (a) warm water (b) a magnet (c) salt (d) sunlight
21. 21.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to wash dishes (c) to clean floors (d) to make bread rise
22. 22.⚖️ 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 amount of water (c) the water temperature (d) the amount of sugar
23. 23.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to colour it (c) to make it heavy (d) it is food for yeast
24. 24.True or false: salt is something yeast needs. (a) False (b) True
25. 25.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
26. 26.🔍 Which is the odd one out? (a) time (b) sunlight (c) warm water (d) sugar
27. 27.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) it shrinks to nothing (c) the balloon is smaller (d) the balloon is bigger
28. 28.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
29. 29.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is the one thing we change. (a) True (b) False
30. 30.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) a small bottle (d) a paper clip
31. 31.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it bursts at once (c) it grows very little (d) it grows much faster
32. 32.True or false: warm water is needed for the yeast balloon. (a) True (b) False
33. 33.True or false: vinegar is something yeast needs. (a) False (b) True
34. 34.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
35. 35.True or false: a comb is needed for the yeast balloon. (a) True (b) False
36. 36.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
37. 37.⚖️ 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 water temperature (c) the amount of yeast
38. 38.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
39. 39.True or false: dry yeast is needed for the yeast balloon. (a) False (b) True
40. 40.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) dry yeast (c) a battery cell (d) warm water

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