Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 935 · 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.📘 What is yeast? (a) a kind of stone (b) a kind of salt (c) a kind of sugar (d) a tiny living fungus
2. 2.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) sunlight (d) time
3. 3.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a magnet (c) a balloon (d) sugar
4. 4.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
5. 5.⚖️ 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
6. 6.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) throw it at a wall (c) keep it for a month (d) pour it down the sink
7. 7.🧺 Which of these is needed for the yeast balloon? (a) dry yeast (b) a comb (c) a mirror (d) a battery cell
8. 8.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) smoke (c) air from outside (d) carbon dioxide gas
9. 9.🔍 Which is the odd one out? (a) a magnet (b) salt (c) time (d) vinegar
10. 10.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a balloon (c) a paper clip (d) a small bottle
11. 11.True or false: a magnet is not needed for the yeast balloon. (a) True (b) False
12. 12.🔍 Which is the odd one out? (a) warm water (b) time (c) salt (d) sugar
13. 13.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is smaller (c) it turns to bread (d) the balloon is bigger
14. 14.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) sugar (c) dry yeast (d) turmeric powder
15. 15.⚖️ 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 sugar (c) size of the balloon
16. 16.True or false: a balloon is not needed for the yeast balloon. (a) False (b) True
17. 17.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
18. 18.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a balloon (c) a battery cell (d) sugar
19. 19.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) sugar (c) a battery cell (d) a magnet
20. 20.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
21. 21.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) time (d) a magnet
22. 22.🔮 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
23. 23.True or false: a battery cell is not needed for the yeast balloon. (a) False (b) True
24. 24.True or false: time is something yeast does not need. (a) False (b) True
25. 25.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
26. 26.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a balloon (c) a mirror (d) warm water
27. 27.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) turmeric powder (c) a small bottle (d) dry yeast
29. 29.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is kept the same. (a) True (b) False
30. 30.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a small bottle (c) a battery cell (d) a balloon
31. 31.True or false: warm water is something yeast needs. (a) False (b) True
32. 32.🔍 Which is the odd one out? (a) sunlight (b) salt (c) a magnet (d) sugar
33. 33.⚖️ 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 water (b) size of the balloon (c) the water temperature (d) the same bottles
34. 34.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
35. 35.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
36. 36.True or false: a mirror is needed for the yeast balloon. (a) False (b) True
37. 37.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
38. 38.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it turns yellow (c) it grows very little (d) it bursts at once
39. 39.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a comb (c) turmeric powder (d) a small bottle
40. 40.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to wash dishes (c) to make bread rise (d) to colour rice

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