Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 926 · 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 is yeast? (a) a kind of sugar (b) a tiny living fungus (c) a kind of salt (d) a kind of stone
2. 2.🔍 Which is the odd one out? (a) sunlight (b) vinegar (c) a magnet (d) warm water
3. 3.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) the yeast is killed (c) it turns to sugar (d) it grows faster
4. 4.⚖️ 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 water (c) the same bottles (d) size of the balloon
5. 5.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) a balloon (c) dry yeast (d) sugar
6. 6.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
7. 7.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) it turns to bread (c) the balloon is smaller (d) the balloon is bigger
8. 8.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
9. 9.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is the one thing we change. (a) True (b) False
10. 10.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the amount of water (b) the water temperature (c) size of the balloon
11. 11.🛟 The water for the yeast should be ___. (a) ice cold (b) warm, not hot (c) very salty (d) boiling hot
12. 12.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a battery cell (b) warm water (c) sugar (d) dry yeast
13. 13.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) throw it at a wall (c) put it in your mouth (d) pour it down the sink
14. 14.🍞 Which of these is something yeast needs? (a) vinegar (b) a magnet (c) sugar (d) sunlight
15. 15.🍞 Which of these is something yeast needs? (a) vinegar (b) sunlight (c) salt (d) time
16. 16.True or false: a battery cell is not needed for the yeast balloon. (a) False (b) True
17. 17.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
18. 18.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the water temperature (b) size of the balloon (c) the amount of yeast
19. 19.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold water is heavy (c) cold slows yeast down (d) cold makes it pink
20. 20.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) smoke (c) carbon dioxide gas (d) air from outside
21. 21.True or false: vinegar is something yeast needs. (a) False (b) True
22. 22.🍞 Which of these is something yeast needs? (a) vinegar (b) warm water (c) a magnet (d) sunlight
23. 23.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
24. 24.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
25. 25.🔍 Which is the odd one out? (a) vinegar (b) sunlight (c) time (d) a magnet
26. 26.⚖️ 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 keep it the same (c) we change it
27. 27.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is kept the same. (a) True (b) False
28. 28.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
29. 29.True or false: time is something yeast does not need. (a) True (b) False
30. 30.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is the one thing we change. (a) True (b) False
31. 31.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to colour rice (c) to clean floors (d) to make bread rise
32. 32.⚖️ 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 measure it (c) we change it
33. 33.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it sweet (c) to make it heavy (d) it is food for yeast
34. 34.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
35. 35.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a small bottle (c) a paper clip (d) sugar
36. 36.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
37. 37.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a paper clip (c) a comb (d) a balloon
38. 38.⚖️ 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 change it (c) we keep it the same
39. 39.🔍 Which is the odd one out? (a) warm water (b) sugar (c) sunlight (d) time
40. 40.True or false: salt is something yeast needs. (a) False (b) True

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