Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 588 · 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? What do we do with “the amount of yeast”? (a) we change it (b) we measure it (c) we keep it the same
2. 2.⚖️ 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 yeast (b) the amount of sugar (c) size of the balloon (d) the water temperature
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 turns yellow (d) it bursts at once
4. 4.🔍 Which is the odd one out? (a) sunlight (b) warm water (c) time (d) sugar
5. 5.🔍 Which is the odd one out? (a) sugar (b) a magnet (c) vinegar (d) salt
6. 6.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) a balloon (d) a mirror
7. 7.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a small bottle (c) dry yeast (d) a magnet
8. 8.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
9. 9.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is smaller (c) the balloon is bigger (d) it shrinks to nothing
10. 10.True or false: a small bottle is needed for the yeast balloon. (a) True (b) False
11. 11.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
12. 12.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it grows faster (c) it turns to sugar (d) it glows
13. 13.🔍 Which is the odd one out? (a) vinegar (b) salt (c) time (d) sunlight
14. 14.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) sunlight (d) sugar
15. 15.🍞 Which of these is something yeast needs? (a) vinegar (b) sugar (c) sunlight (d) salt
16. 16.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
17. 17.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
18. 18.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a balloon (c) a battery cell (d) turmeric powder
19. 19.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) sugar (c) a mirror (d) dry yeast
20. 20.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a balloon (c) a small bottle (d) a comb
21. 21.🧺 Which of these is not needed for the yeast balloon? (a) a battery cell (b) warm water (c) dry yeast (d) sugar
22. 22.🛟 The water for the yeast should be ___. (a) very salty (b) boiling hot (c) ice cold (d) warm, not hot
23. 23.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
24. 24.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
25. 25.📘 What is yeast? (a) a kind of salt (b) a kind of sugar (c) a kind of stone (d) a tiny living fungus
26. 26.🍞 Which of these is something yeast does not need? (a) time (b) a magnet (c) warm water (d) sugar
27. 27.⚖️ 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 same bottles (c) size of the balloon (d) the amount of yeast
28. 28.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold slows yeast down (c) cold water is heavy (d) cold makes it pink
29. 29.True or false: a mirror is needed for the yeast balloon. (a) True (b) False
30. 30.🔍 Which is the odd one out? (a) a magnet (b) salt (c) warm water (d) vinegar
31. 31.⚖️ 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
32. 32.🧺 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) dry yeast
33. 33.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
34. 34.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
35. 35.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
36. 36.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a magnet (c) sugar (d) a comb
37. 37.🍞 Which of these is something yeast needs? (a) salt (b) sunlight (c) vinegar (d) warm water
38. 38.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) warm water (c) a balloon (d) a magnet
39. 39.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
40. 40.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed

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