Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 762 · 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.🍞 Which of these is something yeast needs? (a) vinegar (b) time (c) sunlight (d) a magnet
2. 2.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it turns yellow (c) it bursts at once (d) it grows very little
3. 3.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is kept the same. (a) False (b) True
4. 4.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) carbon dioxide gas (c) air from outside (d) smoke
5. 5.🔮 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
6. 6.True or false: salt is something yeast needs. (a) False (b) True
7. 7.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) sugar (c) dry yeast (d) a magnet
8. 8.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) warm water (c) a small bottle (d) a balloon
9. 9.🔍 Which is the odd one out? (a) time (b) sugar (c) warm water (d) vinegar
10. 10.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to make bread rise (c) to colour rice (d) to wash dishes
11. 11.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
12. 12.True or false: warm water is something yeast needs. (a) True (b) False
13. 13.🧺 Which of these is not needed for the yeast balloon? (a) a comb (b) dry yeast (c) a small bottle (d) a balloon
14. 14.⚖️ 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 same bottles (b) the amount of water (c) the water temperature (d) the amount of yeast
15. 15.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a mirror (c) warm water (d) a battery cell
16. 16.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
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 yeast”? (a) we keep it the same (b) we measure it (c) we change it
18. 18.⚖️ 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
19. 19.True or false: a magnet is something yeast needs. (a) True (b) False
20. 20.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
21. 21.🛟 The water for the yeast should be ___. (a) boiling hot (b) warm, not hot (c) very salty (d) ice cold
22. 22.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) dry yeast (c) a magnet (d) a comb
23. 23.🔍 Which is the odd one out? (a) warm water (b) sugar (c) time (d) sunlight
24. 24.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) turmeric powder (c) sugar (d) a balloon
25. 25.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
26. 26.📘 What is yeast? (a) a kind of stone (b) a tiny living fungus (c) a kind of sugar (d) a kind of salt
27. 27.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a small bottle (c) sugar (d) a comb
28. 28.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) time (d) sunlight
29. 29.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
30. 30.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is kept the same. (a) False (b) True
31. 31.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a magnet (c) a battery cell (d) a balloon
32. 32.🔍 Which is the odd one out? (a) sugar (b) a magnet (c) salt (d) vinegar
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 same bottles (b) size of the balloon (c) the water temperature (d) the amount of water
34. 34.True or false: a comb is needed for the yeast balloon. (a) False (b) True
35. 35.🍞 Which of these is something yeast needs? (a) sugar (b) a magnet (c) sunlight (d) salt
36. 36.⚖️ 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 keep it the same (b) we change it (c) we measure it
37. 37.🔮 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 bigger (d) the balloon is smaller
38. 38.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
39. 39.🔍 Which is the odd one out? (a) salt (b) sugar (c) warm water (d) time
40. 40.🔍 Which is the odd one out? (a) a magnet (b) vinegar (c) sunlight (d) time

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