Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 863 · 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) warm water (b) time (c) sunlight (d) sugar
2. 2.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) vinegar (d) warm water
3. 3.🔍 Which is the odd one out? (a) salt (b) warm water (c) time (d) sugar
4. 4.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) size of the balloon (b) the amount of water (c) the amount of sugar (d) the water temperature
5. 5.⚖️ 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 change it (b) we measure it (c) we keep it the same
6. 6.📘 What is yeast? (a) a tiny living fungus (b) a kind of sugar (c) a kind of stone (d) a kind of salt
7. 7.🔍 Which is the odd one out? (a) warm water (b) sugar (c) vinegar (d) time
8. 8.🔍 Which is the odd one out? (a) sugar (b) vinegar (c) salt (d) sunlight
9. 9.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
10. 10.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) dry yeast (c) a mirror (d) turmeric powder
11. 11.True or false: a comb is not needed for the yeast balloon. (a) True (b) False
12. 12.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) warm water (c) a balloon (d) a mirror
13. 13.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it glows (c) the yeast is killed (d) it turns to sugar
14. 14.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a comb (c) dry yeast (d) sugar
15. 15.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the same bottles (b) size of the balloon (c) the water temperature
16. 16.⚖️ 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) True (b) False
17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) sugar (d) a magnet
18. 18.True or false: vinegar is something yeast does not need. (a) False (b) True
19. 19.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a balloon (c) turmeric powder (d) dry yeast
20. 20.⚖️ 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) True (b) False
21. 21.True or false: time is something yeast does not need. (a) True (b) False
22. 22.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
23. 23.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to wash dishes (c) to clean floors (d) to colour rice
24. 24.⚖️ 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 water (b) size of the balloon (c) the same bottles (d) the water temperature
25. 25.⚖️ 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
26. 26.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) air from outside (c) carbon dioxide gas (d) smoke
27. 27.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) it turns to bread (c) the balloon is bigger (d) the balloon is smaller
28. 28.True or false: sugar is needed for the yeast balloon. (a) True (b) False
29. 29.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
30. 30.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a balloon (c) a magnet (d) a paper clip
31. 31.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to make it sweet (c) it is food for yeast (d) to colour it
32. 32.⚖️ 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 measure it (b) we change it (c) we keep it the same
33. 33.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
34. 34.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
35. 35.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) warm water (c) a small bottle (d) a battery cell
36. 36.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is what we measure. (a) False (b) True
37. 37.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
38. 38.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) a balloon (c) dry yeast (d) a small bottle
39. 39.⚖️ 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) True (b) False
40. 40.True or false: sunlight is something yeast does not need. (a) True (b) False

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