Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 882 · 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.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) sugar (c) a magnet (d) a small bottle
2. 2.🔮 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
3. 3.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) size of the balloon (b) the amount of sugar (c) the water temperature
4. 4.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a small bottle (c) a comb (d) a balloon
5. 5.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
6. 6.🔍 Which is the odd one out? (a) sunlight (b) salt (c) warm water (d) a magnet
7. 7.⚖️ 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 change it (b) we measure it (c) we keep it the same
8. 8.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
9. 9.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a magnet (c) sugar (d) turmeric powder
10. 10.🍞 Which of these is something yeast does not need? (a) sunlight (b) warm water (c) time (d) sugar
11. 11.🍞 Which of these is something yeast does not need? (a) sugar (b) salt (c) warm water (d) time
12. 12.⚖️ 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
13. 13.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to make it heavy (c) to colour it (d) it is food for yeast
14. 14.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
15. 15.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
16. 16.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to wash dishes (c) to clean floors (d) to make bread rise
17. 17.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
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 change it (b) we keep it the same (c) we measure it
19. 19.True or false: sunlight is something yeast does not need. (a) True (b) False
20. 20.True or false: a battery cell is needed for the yeast balloon. (a) True (b) False
21. 21.True or false: a balloon is not needed for the yeast balloon. (a) False (b) True
22. 22.🍞 Which of these is something yeast needs? (a) warm water (b) salt (c) sunlight (d) vinegar
23. 23.🛟 The water for the yeast should be ___. (a) boiling hot (b) very salty (c) warm, not hot (d) ice cold
24. 24.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) sugar (c) a small bottle (d) dry yeast
25. 25.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
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.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
28. 28.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
29. 29.🍞 Which of these is something yeast needs? (a) vinegar (b) sugar (c) sunlight (d) a magnet
30. 30.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the water temperature (b) the amount of yeast (c) the amount of sugar (d) size of the balloon
31. 31.🧺 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 paper clip
32. 32.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
33. 33.⚖️ 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 change it (b) we measure it (c) we keep it the same
34. 34.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a battery cell (c) sugar (d) a small bottle
35. 35.⚖️ 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 keep it the same (b) we change it (c) we measure it
36. 36.⚖️ 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
37. 37.True or false: sugar is something yeast does not need. (a) True (b) False
38. 38.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) sugar (c) warm water (d) dry yeast
39. 39.⚖️ 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
40. 40.🍞 Which of these is something yeast does not need? (a) a magnet (b) warm water (c) time (d) sugar

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