Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 724 · 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.True or false: time is something yeast does not need. (a) True (b) False
2. 2.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) it is food for yeast (c) to make it heavy (d) to colour it
3. 3.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
4. 4.True or false: sugar is something yeast does not need. (a) False (b) True
5. 5.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
6. 6.True or false: sunlight is something yeast needs. (a) True (b) False
7. 7.🔮 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
8. 8.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
9. 9.🛟 The water for the yeast should be ___. (a) warm, not hot (b) ice cold (c) very salty (d) boiling hot
10. 10.⚖️ 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 measure it (c) we keep it the same
11. 11.⚖️ 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 same bottles (c) the amount of yeast (d) the water temperature
12. 12.🍞 Which of these is something yeast needs? (a) sunlight (b) vinegar (c) a magnet (d) sugar
13. 13.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) a paper clip (d) a small bottle
14. 14.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is what we measure. (a) True (b) False
15. 15.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) turmeric powder (d) a small bottle
16. 16.📘 What is yeast? (a) a kind of stone (b) a kind of sugar (c) a kind of salt (d) a tiny living fungus
17. 17.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a balloon (c) a mirror (d) warm water
18. 18.⚖️ 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) the water temperature (c) size of the balloon (d) the amount of yeast
19. 19.⚖️ 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 change it (c) we measure it
20. 20.🔍 Which is the odd one out? (a) warm water (b) a magnet (c) time (d) sugar
21. 21.⚖️ 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
22. 22.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
23. 23.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) dry yeast (c) a balloon (d) a small bottle
24. 24.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
25. 25.⚖️ 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 keep it the same (c) we change it
26. 26.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
27. 27.True or false: sugar is something yeast needs. (a) True (b) False
28. 28.True or false: warm water is something yeast needs. (a) False (b) True
29. 29.⚖️ 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
30. 30.🧺 Which of these is not needed for the yeast balloon? (a) a comb (b) a small bottle (c) a balloon (d) warm water
31. 31.🍞 Which of these is something yeast needs? (a) salt (b) time (c) sunlight (d) vinegar
32. 32.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a mirror (c) warm water (d) a magnet
33. 33.🔍 Which is the odd one out? (a) vinegar (b) sunlight (c) salt (d) warm water
34. 34.True or false: turmeric powder is needed for the yeast balloon. (a) False (b) True
35. 35.True or false: sunlight is something yeast does not need. (a) False (b) True
36. 36.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
37. 37.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold water is heavy (c) cold kills sugar (d) cold makes it pink
38. 38.True or false: warm water is something yeast does not need. (a) True (b) False
39. 39.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) dry yeast (d) a comb
40. 40.🍞 Which of these is something yeast needs? (a) sunlight (b) vinegar (c) a magnet (d) warm water

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