Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 29 · 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) salt (b) warm water (c) sunlight (d) a magnet
2. 2.⚖️ 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 sugar (c) the amount of yeast (d) the water temperature
3. 3.True or false: warm water is something yeast does not need. (a) True (b) False
4. 4.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
5. 5.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
6. 6.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) air from outside (c) steam (d) carbon dioxide gas
7. 7.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold kills sugar (c) cold slows yeast down (d) cold water is heavy
8. 8.True or false: time is something yeast does not need. (a) True (b) False
9. 9.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a mirror (c) a small bottle (d) dry yeast
10. 10.⚖️ 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 measure it (b) we change it (c) we keep it the same
11. 11.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is bigger (c) the balloon is smaller (d) it shrinks to nothing
12. 12.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it bursts at once (c) it grows much faster (d) it grows very little
13. 13.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
14. 14.True or false: a paper clip is not needed for the yeast balloon. (a) True (b) False
15. 15.📘 What is yeast? (a) a kind of sugar (b) a kind of stone (c) a kind of salt (d) a tiny living fungus
16. 16.⚖️ 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) False (b) True
17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) dry yeast (c) sugar (d) a battery cell
18. 18.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a battery cell (c) warm water (d) a paper clip
19. 19.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is kept the same. (a) False (b) True
20. 20.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) turmeric powder (d) a small bottle
21. 21.⚖️ 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
22. 22.🍞 Which of these is something yeast needs? (a) vinegar (b) a magnet (c) time (d) sunlight
23. 23.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
24. 24.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
25. 25.⚖️ 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 measure it (b) we keep it the same (c) we change it
26. 26.🍞 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
27. 27.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
28. 28.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
29. 29.True or false: sunlight is something yeast needs. (a) True (b) False
30. 30.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) sugar (d) a magnet
31. 31.⚖️ 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 same bottles (c) the water temperature (d) the amount of yeast
32. 32.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) sunlight (d) time
33. 33.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
34. 34.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
35. 35.True or false: a mirror is not needed for the yeast balloon. (a) True (b) False
36. 36.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a mirror (c) a comb (d) a small bottle
37. 37.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
38. 38.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a comb (c) warm water (d) dry yeast
39. 39.True or false: sugar is not 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 magnet (b) a small bottle (c) dry yeast (d) a balloon

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