Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 816 · 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.📘 What is yeast? (a) a tiny living fungus (b) a kind of sugar (c) a kind of stone (d) a kind of salt
2. 2.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
3. 3.⚖️ 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 sugar (b) the water temperature (c) the same bottles (d) the amount of yeast
4. 4.⚖️ 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
5. 5.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a small bottle (c) a mirror (d) dry yeast
6. 6.🔍 Which is the odd one out? (a) time (b) sugar (c) salt (d) warm water
7. 7.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is kept the same. (a) False (b) True
8. 8.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) a magnet (d) a balloon
9. 9.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of yeast”? (a) we change it (b) we measure it (c) we keep it the same
10. 10.⚖️ 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 yeast (b) size of the balloon (c) the water temperature
11. 11.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it heavy (c) to make it sweet (d) it is food for yeast
12. 12.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) sugar (c) dry yeast (d) a paper clip
13. 13.⚖️ 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 change it (b) we measure it (c) we keep it the same
14. 14.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
15. 15.⚖️ 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 measure it (c) we change it
16. 16.🔍 Which is the odd one out? (a) vinegar (b) sugar (c) salt (d) sunlight
17. 17.🍞 Which of these is something yeast needs? (a) time (b) a magnet (c) sunlight (d) salt
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 sugar”? (a) we keep it the same (b) we change it (c) we measure it
19. 19.True or false: warm water is something yeast needs. (a) False (b) True
20. 20.🔍 Which is the odd one out? (a) time (b) warm water (c) vinegar (d) sugar
21. 21.True or false: dry yeast is needed for the yeast balloon. (a) False (b) True
22. 22.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it bursts at once (c) it grows very little (d) it turns yellow
23. 23.True or false: salt is something yeast needs. (a) False (b) True
24. 24.🍞 Which of these is something yeast needs? (a) vinegar (b) salt (c) a magnet (d) sugar
25. 25.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) warm water (c) a comb (d) sugar
26. 26.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
27. 27.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) throw it at a wall (c) pour it down the sink (d) keep it for a month
28. 28.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold water is heavy (c) cold kills sugar (d) cold slows yeast down
29. 29.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it grows faster (c) the yeast is killed (d) it glows
30. 30.True or false: time is something yeast needs. (a) False (b) True
31. 31.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
32. 32.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a balloon (c) turmeric powder (d) a magnet
33. 33.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
34. 34.🍞 Which of these is something yeast needs? (a) sunlight (b) warm water (c) salt (d) a magnet
35. 35.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
36. 36.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
37. 37.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a small bottle (c) a balloon (d) turmeric powder
38. 38.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is what we measure. (a) True (b) False
39. 39.True or false: a battery cell is needed for the yeast balloon. (a) False (b) True
40. 40.🔍 Which is the odd one out? (a) time (b) warm water (c) sunlight (d) sugar

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