Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 925 · 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.⚖️ 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) size of the balloon (c) the water temperature (d) the amount of water
2. 2.⚖️ 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 keep it the same (b) we change it (c) we measure it
3. 3.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows much faster (c) it grows very little (d) it turns yellow
4. 4.True or false: a magnet is something yeast needs. (a) False (b) True
5. 5.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) dry yeast (c) a small bottle (d) a balloon
6. 6.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) time (d) salt
7. 7.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it grows faster (c) it turns to sugar (d) it glows
8. 8.🔮 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
9. 9.True or false: vinegar is something yeast does not need. (a) True (b) False
10. 10.🍞 Which of these is something yeast needs? (a) sunlight (b) time (c) a magnet (d) vinegar
11. 11.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a comb (c) a battery cell (d) sugar
12. 12.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) dry yeast (c) a battery cell (d) a mirror
13. 13.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) put it in your mouth (c) throw it at a wall (d) pour it down the sink
14. 14.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is the one thing we change. (a) False (b) True
15. 15.⚖️ 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 measure it (c) we change it
16. 16.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
17. 17.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it sweet (c) to make it heavy (d) it is food for yeast
18. 18.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
19. 19.True or false: a magnet is not needed for the yeast balloon. (a) True (b) False
20. 20.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the amount of sugar (b) size of the balloon (c) the water temperature
21. 21.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a small bottle (c) a comb (d) a magnet
22. 22.True or false: sugar is something yeast does not need. (a) True (b) False
23. 23.⚖️ 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 water
24. 24.True or false: a mirror is needed for the yeast balloon. (a) False (b) True
25. 25.⚖️ 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 water temperature (c) the same bottles (d) the amount of water
26. 26.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a mirror (c) warm water (d) dry yeast
27. 27.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a paper clip (c) a balloon (d) warm water
28. 28.⚖️ 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 same bottles
29. 29.True or false: a battery cell is needed for the yeast balloon. (a) False (b) True
30. 30.🔍 Which is the odd one out? (a) time (b) a magnet (c) sugar (d) warm water
31. 31.⚖️ 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) False (b) True
32. 32.True or false: warm water is needed for the yeast balloon. (a) False (b) True
33. 33.🔍 Which is the odd one out? (a) time (b) salt (c) warm water (d) sugar
34. 34.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) a balloon (d) a magnet
35. 35.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
36. 36.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
37. 37.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is the one thing we change. (a) False (b) True
38. 38.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a mirror (c) dry yeast (d) a small bottle
39. 39.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the water temperature”? (a) we measure it (b) we change it (c) we keep it the same
40. 40.🔍 Which is the odd one out? (a) warm water (b) sugar (c) time (d) sunlight

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