Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 736 · 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.⚖️ 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) size of the balloon (c) the same bottles
2. 2.🔍 Which is the odd one out? (a) warm water (b) vinegar (c) sunlight (d) salt
3. 3.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
4. 4.🍞 Which of these is something yeast needs? (a) a magnet (b) salt (c) sugar (d) sunlight
5. 5.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
6. 6.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
7. 7.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
8. 8.⚖️ 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 water (c) the same bottles (d) the water temperature
9. 9.🍞 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
10. 10.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is the one thing we change. (a) True (b) False
11. 11.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) sugar (d) a comb
12. 12.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a small bottle (c) dry yeast (d) a magnet
13. 13.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to colour rice (c) to clean floors (d) to wash dishes
14. 14.⚖️ 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) False (b) True
15. 15.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
16. 16.🍞 Which of these is something yeast does not need? (a) a magnet (b) warm water (c) sugar (d) time
17. 17.⚖️ 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 measure it (c) we change it
18. 18.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) smoke (c) steam (d) carbon dioxide gas
19. 19.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) it shrinks to nothing (c) it turns to bread (d) the balloon is bigger
20. 20.⚖️ 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 measure it (b) we change it (c) we keep it the same
21. 21.🔍 Which is the odd one out? (a) sugar (b) time (c) vinegar (d) warm water
22. 22.⚖️ 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 measure it (c) we change it
23. 23.True or false: a paper clip is not needed for the yeast balloon. (a) False (b) True
24. 24.🍞 Which of these is something yeast needs? (a) sunlight (b) warm water (c) a magnet (d) vinegar
25. 25.⚖️ 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) size of the balloon (c) the amount of sugar
26. 26.True or false: sunlight is something yeast does not need. (a) False (b) True
27. 27.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a battery cell (c) sugar (d) turmeric powder
28. 28.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
29. 29.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a magnet (c) sugar (d) a balloon
30. 30.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
31. 31.🛟 The water for the yeast should be ___. (a) ice cold (b) warm, not hot (c) very salty (d) boiling hot
32. 32.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
33. 33.🔍 Which is the odd one out? (a) a magnet (b) sugar (c) time (d) warm water
34. 34.True or false: sugar is something yeast does not need. (a) False (b) True
35. 35.🔍 Which is the odd one out? (a) salt (b) sugar (c) a magnet (d) vinegar
36. 36.🍞 Which of these is something yeast does not need? (a) warm water (b) salt (c) sugar (d) time
37. 37.🍞 Does yeast need warm water 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? What do we do with “the water temperature”? (a) we keep it the same (b) we measure it (c) we change it
39. 39.True or false: sunlight is something yeast needs. (a) True (b) False
40. 40.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a mirror (c) a paper clip (d) a balloon

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