Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 414 · 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: vinegar is something yeast needs. (a) True (b) False
2. 2.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) put it in your mouth (c) keep it for a month (d) throw it at a wall
3. 3.🍞 Which of these is something yeast does not need? (a) sugar (b) salt (c) warm water (d) time
4. 4.True or false: warm water is needed for the yeast balloon. (a) True (b) False
5. 5.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
6. 6.⚖️ 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 measure it (c) we change it
7. 7.⚖️ 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
8. 8.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
9. 9.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a battery cell (c) a magnet (d) dry yeast
10. 10.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it grows much faster (c) it turns yellow (d) it bursts at once
11. 11.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
12. 12.True or false: a battery cell is needed for the yeast balloon. (a) True (b) False
13. 13.⚖️ 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 keep it the same (b) we change it (c) we measure it
14. 14.⚖️ 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 yeast (b) the same bottles (c) size of the balloon (d) the water temperature
15. 15.⚖️ 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
16. 16.⚖️ 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 measure it (b) we change it (c) we keep it the same
17. 17.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
18. 18.🍞 Which of these is something yeast needs? (a) salt (b) sugar (c) a magnet (d) sunlight
19. 19.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) the balloon is smaller (c) it shrinks to nothing (d) it turns to bread
20. 20.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a balloon (c) a battery cell (d) sugar
21. 21.🍞 Which of these is something yeast needs? (a) vinegar (b) warm water (c) a magnet (d) sunlight
22. 22.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
23. 23.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) the yeast is killed (c) it grows faster (d) it turns to sugar
24. 24.⚖️ 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
25. 25.🍞 Which of these is something yeast needs? (a) time (b) a magnet (c) vinegar (d) salt
26. 26.⚖️ 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 keep it the same (c) we measure it
27. 27.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) warm water (c) a battery cell (d) a balloon
28. 28.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
29. 29.📘 What is yeast? (a) a kind of sugar (b) a tiny living fungus (c) a kind of salt (d) a kind of stone
30. 30.🔍 Which is the odd one out? (a) salt (b) sugar (c) sunlight (d) a magnet
31. 31.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) warm water (c) sugar (d) a mirror
32. 32.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
33. 33.⚖️ 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 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 small bottle (b) warm water (c) a mirror (d) sugar
35. 35.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a magnet (c) sugar (d) a battery cell
36. 36.🔍 Which is the odd one out? (a) warm water (b) sugar (c) time (d) salt
37. 37.🔍 Which is the odd one out? (a) salt (b) vinegar (c) a magnet (d) warm water
38. 38.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
39. 39.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) warm water (d) sunlight
40. 40.True or false: a paper clip is needed for the yeast balloon. (a) False (b) True

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