Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 409 · 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.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
2. 2.🔍 Which is the odd one out? (a) time (b) warm water (c) sugar (d) salt
3. 3.🔍 Which is the odd one out? (a) sunlight (b) a magnet (c) salt (d) time
4. 4.⚖️ 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) the amount of sugar (c) the same bottles (d) size of the balloon
5. 5.🍞 Which of these is something yeast needs? (a) vinegar (b) sunlight (c) warm water (d) a magnet
6. 6.True or false: time is something yeast needs. (a) True (b) False
7. 7.True or false: a battery cell is needed for the yeast balloon. (a) True (b) False
8. 8.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold kills sugar (c) cold makes it pink (d) cold slows yeast down
9. 9.📘 What is yeast? (a) a kind of sugar (b) a kind of salt (c) a kind of stone (d) a tiny living fungus
10. 10.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
11. 11.⚖️ 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 keep it the same (b) we change it (c) we measure it
12. 12.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
13. 13.True or false: vinegar is something yeast needs. (a) False (b) True
14. 14.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is what we measure. (a) False (b) True
15. 15.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) turmeric powder (c) a balloon (d) warm water
16. 16.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) a balloon (c) warm water (d) dry yeast
17. 17.🔍 Which is the odd one out? (a) a magnet (b) salt (c) sugar (d) sunlight
18. 18.⚖️ 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
19. 19.True or false: a balloon is needed for the yeast balloon. (a) False (b) True
20. 20.⚖️ 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) size of the balloon (c) the water temperature (d) the amount of yeast
21. 21.⚖️ 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
22. 22.True or false: a comb is not needed for the yeast balloon. (a) True (b) False
23. 23.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) it is food for yeast (c) to colour it (d) to make it heavy
24. 24.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a battery cell (c) dry yeast (d) a mirror
25. 25.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) put it in your mouth (c) pour it down the sink (d) keep it for a month
26. 26.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) time (d) a magnet
27. 27.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
28. 28.True or false: a small bottle is needed for the yeast balloon. (a) False (b) True
29. 29.🍞 Which of these is something yeast needs? (a) vinegar (b) sunlight (c) salt (d) time
30. 30.True or false: a mirror is needed for the yeast balloon. (a) True (b) False
31. 31.True or false: warm water is something yeast does not need. (a) False (b) True
32. 32.⚖️ 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
33. 33.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a balloon (c) a magnet (d) a small bottle
34. 34.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows much faster (c) it grows very little (d) it bursts at once
35. 35.True or false: salt is something yeast needs. (a) False (b) True
36. 36.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
37. 37.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a balloon (c) a paper clip (d) a battery cell
38. 38.⚖️ 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
39. 39.🍞 Which of these is something yeast needs? (a) sunlight (b) salt (c) vinegar (d) sugar
40. 40.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) it shrinks to nothing (c) it turns to bread (d) the balloon is smaller

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