Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 306 · 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.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold slows yeast down (c) cold kills sugar (d) cold water is heavy
2. 2.🔍 Which is the odd one out? (a) warm water (b) time (c) vinegar (d) sugar
3. 3.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
4. 4.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
5. 5.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) steam (c) air from outside (d) carbon dioxide gas
6. 6.⚖️ 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 keep it the same (b) we change it (c) we measure it
7. 7.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows very little (c) it bursts at once (d) it grows much faster
8. 8.🛟 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
9. 9.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) the balloon is bigger (c) it shrinks to nothing (d) it turns to bread
10. 10.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
11. 11.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
12. 12.⚖️ 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
13. 13.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) sugar (d) a magnet
14. 14.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it turns to sugar (c) it grows faster (d) the yeast is killed
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) size of the balloon (b) the amount of yeast (c) the water temperature
16. 16.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
17. 17.🔍 Which is the odd one out? (a) warm water (b) salt (c) sunlight (d) a magnet
18. 18.True or false: a paper clip is needed for the yeast balloon. (a) True (b) False
19. 19.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is the one thing we change. (a) False (b) True
20. 20.⚖️ 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 change it (c) we keep it the same
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 water”? (a) we keep it the same (b) we measure it (c) we change it
22. 22.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the same bottles”? (a) we keep it the same (b) we change it (c) we measure it
23. 23.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) sugar (c) warm water (d) turmeric powder
24. 24.⚖️ 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) 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 keep it the same (b) we change it (c) we measure it
26. 26.🍞 Which of these is something yeast needs? (a) vinegar (b) a magnet (c) salt (d) warm water
27. 27.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
28. 28.🔍 Which is the odd one out? (a) time (b) sunlight (c) vinegar (d) a magnet
29. 29.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
30. 30.True or false: a battery cell is not needed for the yeast balloon. (a) True (b) False
31. 31.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) dry yeast (c) a mirror (d) a balloon
32. 32.True or false: salt is something yeast needs. (a) True (b) False
33. 33.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) sugar (c) turmeric powder (d) dry yeast
34. 34.⚖️ 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 water temperature (c) the amount of yeast (d) the amount of water
35. 35.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
36. 36.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
37. 37.🧺 Which of these is needed for the yeast balloon? (a) sugar (b) turmeric powder (c) a mirror (d) a comb
38. 38.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a small bottle (c) a mirror (d) warm water
39. 39.🔍 Which is the odd one out? (a) time (b) a magnet (c) warm water (d) sugar
40. 40.🍞 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

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