Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 367 · 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.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) smoke (c) steam (d) air from outside
2. 2.🔍 Which is the odd one out? (a) warm water (b) time (c) sugar (d) sunlight
3. 3.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is kept the same. (a) True (b) False
4. 4.⚖️ 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 same bottles (b) the water temperature (c) the amount of yeast (d) the amount of sugar
5. 5.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows very little (c) it bursts at once (d) it grows much faster
6. 6.🍞 Which of these is something yeast needs? (a) vinegar (b) a magnet (c) salt (d) sugar
7. 7.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is the one thing we change. (a) False (b) True
8. 8.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
9. 9.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
10. 10.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) turmeric powder (c) a paper clip (d) sugar
11. 11.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) sunlight (d) time
12. 12.🔍 Which is the odd one out? (a) time (b) a magnet (c) salt (d) vinegar
13. 13.🍞 Which of these is something yeast needs? (a) sunlight (b) warm water (c) a magnet (d) vinegar
14. 14.🔍 Which is the odd one out? (a) sugar (b) time (c) a magnet (d) warm water
15. 15.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold water is heavy (c) cold makes it pink (d) cold slows yeast down
16. 16.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is kept the same. (a) False (b) True
17. 17.🔍 Which is the odd one out? (a) warm water (b) time (c) sugar (d) vinegar
18. 18.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
19. 19.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) warm water (c) a comb (d) a small bottle
20. 20.🛟 The water for the yeast should be ___. (a) ice cold (b) very salty (c) warm, not hot (d) boiling hot
21. 21.True or false: salt is something yeast needs. (a) True (b) False
22. 22.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) the balloon is bigger (c) it turns to bread (d) it shrinks to nothing
23. 23.True or false: a battery cell is not needed for the yeast balloon. (a) False (b) True
24. 24.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the same bottles (b) the water temperature (c) size of the balloon
25. 25.⚖️ 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 amount of sugar (c) size of the balloon (d) the water temperature
26. 26.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) a mirror (d) a small bottle
27. 27.🔍 Which is the odd one out? (a) warm water (b) salt (c) time (d) sugar
28. 28.🔍 Which is the odd one out? (a) sunlight (b) warm water (c) vinegar (d) salt
29. 29.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
30. 30.True or false: a magnet is something yeast needs. (a) True (b) False
31. 31.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a paper clip (c) warm water (d) sugar
32. 32.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a balloon (c) turmeric powder (d) dry yeast
33. 33.⚖️ 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) True (b) False
34. 34.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
35. 35.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) a small bottle (c) a balloon (d) warm water
36. 36.⚖️ 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 change it (c) we measure it
37. 37.⚖️ 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
38. 38.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a balloon (c) turmeric powder (d) a paper clip
39. 39.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
40. 40.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a mirror (c) a battery cell (d) a small bottle

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