Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 805 · 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: warm water is not needed for the yeast balloon. (a) True (b) False
2. 2.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it glows (c) the yeast is killed (d) it grows faster
3. 3.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it heavy (c) to make it sweet (d) it is food for yeast
4. 4.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
5. 5.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a balloon (c) sugar (d) a battery cell
6. 6.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
7. 7.🔍 Which is the odd one out? (a) warm water (b) sugar (c) time (d) a magnet
8. 8.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) put it in your mouth (c) pour it down the sink (d) throw it at a wall
9. 9.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a comb (d) a small bottle
10. 10.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) air from outside (c) smoke (d) carbon dioxide gas
11. 11.🔍 Which is the odd one out? (a) salt (b) sugar (c) a magnet (d) sunlight
12. 12.⚖️ 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
13. 13.🛟 The water for the yeast should be ___. (a) ice cold (b) warm, not hot (c) very salty (d) boiling hot
14. 14.True or false: sugar is needed for the yeast balloon. (a) True (b) False
15. 15.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a magnet (c) warm water (d) sugar
16. 16.True or false: sunlight is something yeast needs. (a) False (b) True
17. 17.🍞 Which of these is something yeast needs? (a) salt (b) time (c) a magnet (d) sunlight
18. 18.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a magnet (c) a mirror (d) a balloon
19. 19.🍞 Which of these is something yeast does not need? (a) sugar (b) sunlight (c) warm water (d) time
20. 20.⚖️ 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 keep it the same (c) we measure it
21. 21.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) dry yeast (c) a paper clip (d) sugar
22. 22.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is bigger (c) the balloon is smaller (d) it turns to bread
23. 23.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold slows yeast down (c) cold kills sugar (d) cold water is heavy
24. 24.🍞 Which of these is something yeast needs? (a) warm water (b) sunlight (c) vinegar (d) salt
25. 25.⚖️ 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 measure it (b) we change it (c) we keep it the same
26. 26.🍞 Which of these is something yeast does not need? (a) sugar (b) vinegar (c) time (d) warm water
27. 27.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
28. 28.True or false: a paper clip is needed for the yeast balloon. (a) True (b) False
29. 29.🧺 Which of these is not needed for the yeast balloon? (a) a battery cell (b) sugar (c) a balloon (d) a small bottle
30. 30.🔍 Which is the odd one out? (a) warm water (b) sugar (c) sunlight (d) time
31. 31.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a paper clip (c) a balloon (d) warm water
32. 32.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
33. 33.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) dry yeast (c) a magnet (d) a mirror
34. 34.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
35. 35.True or false: a magnet is needed for the yeast balloon. (a) False (b) True
36. 36.⚖️ 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 water temperature (b) size of the balloon (c) the same bottles (d) the amount of sugar
37. 37.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
38. 38.🔮 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
39. 39.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) turmeric powder (c) warm water (d) sugar
40. 40.True or false: salt is something yeast does not need. (a) False (b) True

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