Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 535 · 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.True or false: a mirror is not needed for the yeast balloon. (a) False (b) True
2. 2.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) air from outside (c) smoke (d) steam
3. 3.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
4. 4.True or false: warm water is something yeast needs. (a) True (b) False
5. 5.📘 What is yeast? (a) a kind of sugar (b) a kind of salt (c) a tiny living fungus (d) a kind of stone
6. 6.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a magnet (c) warm water (d) sugar
7. 7.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) warm water (d) a magnet
8. 8.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) turmeric powder (c) sugar (d) a magnet
9. 9.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
10. 10.⚖️ 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
11. 11.🔍 Which is the odd one out? (a) warm water (b) sunlight (c) time (d) sugar
12. 12.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) warm water (c) sugar (d) turmeric powder
13. 13.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) sugar (c) warm water (d) a small bottle
14. 14.⚖️ 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
15. 15.🔍 Which is the odd one out? (a) salt (b) sugar (c) time (d) warm water
16. 16.⚖️ 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 same bottles (c) the amount of yeast (d) size of the balloon
17. 17.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it turns yellow (c) it bursts at once (d) it grows much faster
18. 18.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is what we measure. (a) False (b) True
19. 19.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) vinegar (d) warm water
20. 20.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a small bottle (c) a comb (d) turmeric powder
21. 21.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it grows faster (c) it glows (d) the yeast is killed
22. 22.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
23. 23.⚖️ 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 water temperature (c) the amount of water (d) the amount of yeast
24. 24.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a battery cell (b) dry yeast (c) warm water (d) a small bottle
25. 25.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is what we measure. (a) False (b) True
26. 26.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a paper clip (c) warm water (d) turmeric powder
27. 27.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold water is heavy (c) cold kills sugar (d) cold makes it pink
28. 28.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
29. 29.True or false: time is something yeast does not need. (a) False (b) True
30. 30.True or false: a comb is needed for the yeast balloon. (a) False (b) True
31. 31.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) put it in your mouth (c) keep it for a month (d) pour it down the sink
32. 32.🍞 Which of these is something yeast needs? (a) vinegar (b) warm water (c) sunlight (d) a magnet
33. 33.True or false: warm water is something yeast does not need. (a) False (b) True
34. 34.⚖️ 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
35. 35.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) it is food for yeast (c) to colour it (d) to make it sweet
36. 36.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
37. 37.⚖️ 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 change it (c) we keep it the same
38. 38.🔍 Which is the odd one out? (a) salt (b) vinegar (c) sunlight (d) time
39. 39.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
40. 40.🔍 Which is the odd one out? (a) a magnet (b) sunlight (c) salt (d) warm water

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