Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 619 · 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 is the odd one out? (a) sunlight (b) vinegar (c) warm water (d) salt
2. 2.⚖️ 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
3. 3.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it turns yellow (c) it grows much faster (d) it bursts at once
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) turmeric powder (b) a small bottle (c) a balloon (d) warm water
5. 5.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
6. 6.⚖️ 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
7. 7.⚖️ 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) True (b) False
8. 8.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
9. 9.True or false: a battery cell is not needed for the yeast balloon. (a) False (b) True
10. 10.True or false: time is something yeast does not need. (a) True (b) False
11. 11.True or false: sunlight is something yeast needs. (a) True (b) False
12. 12.⚖️ 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 yeast (c) size of the balloon
13. 13.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
14. 14.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a magnet (c) dry yeast (d) a battery cell
15. 15.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
16. 16.⚖️ 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) True (b) False
17. 17.🍞 Which of these is something yeast needs? (a) warm water (b) vinegar (c) salt (d) sunlight
18. 18.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is the one thing we change. (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 water temperature is the one thing we change. (a) True (b) False
20. 20.🔍 Which is the odd one out? (a) vinegar (b) a magnet (c) time (d) salt
21. 21.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
22. 22.🛟 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
23. 23.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) steam (c) smoke (d) carbon dioxide gas
24. 24.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold water is heavy (c) cold makes it pink (d) cold slows yeast down
25. 25.True or false: a small bottle is not needed for the yeast balloon. (a) False (b) True
26. 26.True or false: sugar is something yeast does not need. (a) True (b) False
27. 27.⚖️ 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
28. 28.⚖️ 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 amount of sugar (c) the water temperature (d) the amount of water
29. 29.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) dry yeast (c) a small bottle (d) sugar
30. 30.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
31. 31.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a paper clip (c) warm water (d) a balloon
32. 32.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a mirror (c) dry yeast (d) warm water
33. 33.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it heavy (c) it is food for yeast (d) to make it sweet
34. 34.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
35. 35.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a mirror (c) a small bottle (d) a magnet
36. 36.🍞 Which of these is something yeast needs? (a) sunlight (b) sugar (c) salt (d) a magnet
37. 37.🔍 Which is the odd one out? (a) sugar (b) vinegar (c) warm water (d) time
38. 38.True or false: a paper clip is needed for the yeast balloon. (a) True (b) False
39. 39.True or false: a mirror is needed for the yeast balloon. (a) False (b) True
40. 40.True or false: vinegar is something yeast does not need. (a) False (b) True

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