Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 682 · 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.🛟 The water for the yeast should be ___. (a) very salty (b) ice cold (c) warm, not hot (d) boiling hot
2. 2.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) sugar (c) dry yeast (d) warm water
3. 3.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to clean floors (c) to wash dishes (d) to colour rice
4. 4.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) sugar (d) sunlight
5. 5.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a battery cell (c) warm water (d) a comb
6. 6.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) turmeric powder (c) a magnet (d) dry yeast
7. 7.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
8. 8.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
9. 9.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) warm water (c) a paper clip (d) dry yeast
10. 10.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) dry yeast (d) a paper clip
11. 11.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is bigger (c) the balloon is smaller (d) it shrinks to nothing
12. 12.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it turns yellow (c) it bursts at once (d) it grows much faster
13. 13.🔍 Which is the odd one out? (a) salt (b) sunlight (c) a magnet (d) sugar
14. 14.🔍 Which is the odd one out? (a) sugar (b) warm water (c) time (d) salt
15. 15.True or false: a battery cell is not needed for the yeast balloon. (a) True (b) False
16. 16.🔍 Which is the odd one out? (a) salt (b) a magnet (c) vinegar (d) time
17. 17.⚖️ 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 measure it (c) we change it
18. 18.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the amount of sugar (b) the amount of water (c) size of the balloon (d) the water temperature
19. 19.True or false: time is something yeast needs. (a) False (b) True
20. 20.True or false: sugar is something yeast needs. (a) True (b) False
21. 21.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
22. 22.🍞 Which of these is something yeast does not need? (a) vinegar (b) time (c) warm water (d) sugar
23. 23.⚖️ 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 measure it (b) we keep it the same (c) we change 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 the one thing we change. (a) False (b) True
25. 25.🍞 Which of these is something yeast does not need? (a) time (b) a magnet (c) sugar (d) warm water
26. 26.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it turns to sugar (c) the yeast is killed (d) it grows faster
27. 27.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) warm water (c) dry yeast (d) a mirror
29. 29.🍞 Which of these is something yeast needs? (a) vinegar (b) a magnet (c) time (d) sunlight
30. 30.⚖️ 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 keep it the same (b) we measure it (c) we change it
31. 31.True or false: a paper clip is needed for the yeast balloon. (a) False (b) True
32. 32.🔍 Which is the odd one out? (a) salt (b) warm water (c) vinegar (d) sunlight
33. 33.⚖️ 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
34. 34.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a small bottle (c) sugar (d) a battery cell
35. 35.🍞 Which of these is something yeast needs? (a) a magnet (b) salt (c) warm water (d) vinegar
36. 36.True or false: warm water is something yeast needs. (a) False (b) True
37. 37.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
38. 38.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
39. 39.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
40. 40.📘 What is yeast? (a) a kind of sugar (b) a kind of stone (c) a kind of salt (d) a tiny living fungus

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