Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 562 · 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) size of the balloon (b) the water temperature (c) the amount of yeast
2. 2.⚖️ 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
3. 3.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it grows much faster (c) it bursts at once (d) it turns yellow
4. 4.True or false: time is something yeast needs. (a) True (b) False
5. 5.🛟 The water for the yeast should be ___. (a) warm, not hot (b) ice cold (c) boiling hot (d) very salty
6. 6.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to colour it (c) to make it heavy (d) it is food for yeast
7. 7.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) a magnet (d) time
8. 8.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) smoke (c) steam (d) carbon dioxide gas
9. 9.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
10. 10.🍞 Which of these is something yeast needs? (a) vinegar (b) a magnet (c) warm water (d) salt
11. 11.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) a magnet (c) a balloon (d) dry yeast
12. 12.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
13. 13.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a paper clip (c) a magnet (d) dry yeast
14. 14.⚖️ 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
15. 15.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a battery cell (c) a balloon (d) a magnet
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 water temperature (b) the amount of water (c) the same bottles (d) size of the balloon
17. 17.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) sugar (d) salt
18. 18.🧺 Which of these is not needed for the yeast balloon? (a) turmeric powder (b) sugar (c) dry yeast (d) a balloon
19. 19.⚖️ 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 change it (b) we keep it the same (c) we measure it
20. 20.True or false: warm water is needed for the yeast balloon. (a) False (b) True
21. 21.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) warm water (c) a small bottle (d) a paper clip
22. 22.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
23. 23.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
24. 24.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is what we measure. (a) False (b) True
25. 25.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a balloon (c) sugar (d) a comb
26. 26.True or false: a paper clip is needed for the yeast balloon. (a) True (b) False
27. 27.True or false: a magnet is something yeast needs. (a) True (b) False
28. 28.🍞 Which of these is something yeast does not need? (a) time (b) sunlight (c) warm water (d) sugar
29. 29.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
30. 30.📘 What is yeast? (a) a tiny living fungus (b) a kind of salt (c) a kind of sugar (d) a kind of stone
31. 31.True or false: salt is something yeast does not need. (a) True (b) False
32. 32.True or false: turmeric powder is needed for the yeast balloon. (a) True (b) False
33. 33.🍞 Which of these is something yeast needs? (a) a magnet (b) vinegar (c) salt (d) time
34. 34.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to wash dishes (c) to colour rice (d) to make bread rise
35. 35.⚖️ 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
36. 36.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is kept the same. (a) False (b) True
37. 37.🍞 Which of these is something yeast needs? (a) a magnet (b) sunlight (c) salt (d) sugar
38. 38.🍞 Which of these is something yeast does not need? (a) warm water (b) vinegar (c) time (d) sugar
39. 39.True or false: time is something yeast does not need. (a) False (b) True
40. 40.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it glows (c) it turns to sugar (d) the yeast is killed

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