Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 165 · 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.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it grows faster (c) it glows (d) it turns to sugar
2. 2.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) carbon dioxide gas (c) smoke (d) steam
3. 3.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
4. 4.🔮 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
5. 5.⚖️ 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) size of the balloon (c) the water temperature (d) the amount of yeast
6. 6.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) pour it down the sink (c) keep it for a month (d) throw it at a wall
7. 7.True or false: a battery cell is needed for the yeast balloon. (a) False (b) True
8. 8.True or false: a battery cell is not needed for the yeast balloon. (a) True (b) False
9. 9.⚖️ 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
10. 10.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
11. 11.🍞 Which of these is something yeast needs? (a) vinegar (b) salt (c) warm water (d) sunlight
12. 12.True or false: sugar is something yeast does not need. (a) True (b) False
13. 13.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) a magnet (c) a comb (d) a mirror
14. 14.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the same bottles (b) size of the balloon (c) the amount of water (d) the water temperature
15. 15.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) dry yeast (c) turmeric powder (d) warm water
16. 16.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to clean floors (c) to colour rice (d) to wash dishes
17. 17.🔍 Which is the odd one out? (a) time (b) sunlight (c) warm water (d) sugar
18. 18.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a magnet (c) sugar (d) a small bottle
19. 19.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
20. 20.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
21. 21.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) a battery cell (d) warm water
22. 22.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to colour it (c) to make it sweet (d) it is food for yeast
23. 23.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) turmeric powder (c) dry yeast (d) a magnet
24. 24.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a balloon (c) a mirror (d) a small bottle
25. 25.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) sugar (c) a small bottle (d) a magnet
26. 26.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
27. 27.⚖️ 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
28. 28.True or false: vinegar is something yeast does not need. (a) False (b) True
29. 29.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) sunlight (d) warm water
30. 30.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
31. 31.🔍 Which is the odd one out? (a) warm water (b) sugar (c) a magnet (d) time
32. 32.⚖️ 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
33. 33.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
34. 34.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
35. 35.🍞 Which of these is something yeast does not need? (a) salt (b) sugar (c) time (d) warm water
36. 36.⚖️ 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
37. 37.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
38. 38.⚖️ 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 water (b) size of the balloon (c) the water temperature
39. 39.🍞 Which of these is something yeast does not need? (a) time (b) a magnet (c) sugar (d) warm water
40. 40.True or false: vinegar is something yeast needs. (a) True (b) False

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