Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 481 · 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.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
2. 2.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
3. 3.🍞 Which of these is something yeast needs? (a) salt (b) a magnet (c) time (d) vinegar
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) a magnet (d) sugar
5. 5.True or false: a balloon is needed for the yeast balloon. (a) True (b) False
6. 6.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a battery cell (c) dry yeast (d) warm water
7. 7.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) air from outside (c) smoke (d) steam
8. 8.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
9. 9.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) turmeric powder (d) a balloon
10. 10.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold kills sugar (c) cold water is heavy (d) cold slows yeast down
11. 11.⚖️ 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 keep it the same (c) we change it
12. 12.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is bigger (c) it shrinks to nothing (d) the balloon is smaller
13. 13.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a battery cell (c) sugar (d) a mirror
14. 14.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
15. 15.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
16. 16.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) warm water (c) sugar (d) dry yeast
17. 17.🛟 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
18. 18.🛟 The water for the yeast should be ___. (a) very salty (b) boiling hot (c) warm, not hot (d) ice cold
19. 19.🔍 Which is the odd one out? (a) sugar (b) salt (c) time (d) warm water
20. 20.⚖️ 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
21. 21.⚖️ 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 water (b) the water temperature (c) the amount of sugar (d) size of the balloon
22. 22.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it grows faster (c) it glows (d) it turns to sugar
23. 23.⚖️ 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 keep it the same (c) we measure it
24. 24.⚖️ 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
25. 25.🍞 Which of these is something yeast needs? (a) vinegar (b) salt (c) warm water (d) sunlight
26. 26.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a mirror (c) dry yeast (d) a balloon
27. 27.True or false: a comb is not needed for the yeast balloon. (a) False (b) True
28. 28.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it turns yellow (c) it grows very little (d) it bursts at once
29. 29.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a paper clip (c) warm water (d) sugar
30. 30.⚖️ 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
31. 31.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a magnet (c) a balloon (d) dry yeast
32. 32.⚖️ 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 change it (b) we measure it (c) we keep it the same
33. 33.True or false: time is something yeast needs. (a) False (b) True
34. 34.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
35. 35.True or false: a battery cell is not needed for the yeast balloon. (a) False (b) True
36. 36.🍞 Which of these is something yeast needs? (a) salt (b) a magnet (c) sugar (d) sunlight
37. 37.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is kept the same. (a) False (b) True
38. 38.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) it is food for yeast (c) to colour it (d) to make it sweet
39. 39.⚖️ 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 keep it the same (c) we measure it
40. 40.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed

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