Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 75 · 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.🔍 Which is the odd one out? (a) warm water (b) sugar (c) time (d) vinegar
2. 2.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) put it in your mouth (c) keep it for a month (d) pour it down the sink
3. 3.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) smoke (c) air from outside (d) carbon dioxide gas
4. 4.⚖️ 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
5. 5.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
6. 6.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) the balloon is smaller (c) it turns to bread (d) it shrinks to nothing
7. 7.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
8. 8.True or false: salt is something yeast needs. (a) False (b) True
9. 9.⚖️ 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) size of the balloon (b) the water temperature (c) the same bottles (d) the amount of water
10. 10.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) a mirror (d) a small bottle
11. 11.🔍 Which is the odd one out? (a) sunlight (b) salt (c) vinegar (d) sugar
12. 12.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) warm water (c) a comb (d) a mirror
13. 13.🔍 Which is the odd one out? (a) salt (b) warm water (c) vinegar (d) a magnet
14. 14.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
15. 15.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) a battery cell (c) warm water (d) a balloon
16. 16.🔍 Which is the odd one out? (a) warm water (b) a magnet (c) time (d) sugar
17. 17.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to make it sweet (c) to colour it (d) it is food for yeast
18. 18.🛟 The water for the yeast should be ___. (a) ice cold (b) very salty (c) boiling hot (d) warm, not hot
19. 19.⚖️ 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
20. 20.⚖️ 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
21. 21.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
22. 22.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
23. 23.🍞 Which of these is something yeast needs? (a) a magnet (b) warm water (c) vinegar (d) salt
24. 24.⚖️ 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 keep it the same (b) we measure it (c) we change it
25. 25.True or false: warm water is something yeast does not need. (a) False (b) True
26. 26.⚖️ 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) True (b) False
27. 27.🍞 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
28. 28.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it glows (c) it grows faster (d) the yeast is killed
29. 29.True or false: a comb is not needed for the yeast balloon. (a) True (b) False
30. 30.⚖️ 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
31. 31.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is what we measure. (a) False (b) True
32. 32.🍞 Which of these is something yeast needs? (a) sunlight (b) salt (c) sugar (d) a magnet
33. 33.🔍 Which is the odd one out? (a) sunlight (b) time (c) sugar (d) warm water
34. 34.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
35. 35.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) a paper clip (d) dry yeast
36. 36.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
37. 37.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a balloon (c) a comb (d) dry yeast
38. 38.True or false: a mirror is not needed for the yeast balloon. (a) False (b) True
39. 39.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
40. 40.⚖️ 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 keep it the same (b) we change it (c) we measure it

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