Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 95 · 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.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
2. 2.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a paper clip (c) sugar (d) turmeric powder
3. 3.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
4. 4.🔍 Which is the odd one out? (a) salt (b) warm water (c) sunlight (d) vinegar
5. 5.🛟 The water for the yeast should be ___. (a) very salty (b) ice cold (c) boiling hot (d) warm, not hot
6. 6.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
7. 7.🍞 Which of these is something yeast needs? (a) sugar (b) salt (c) vinegar (d) sunlight
8. 8.⚖️ 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
9. 9.True or false: warm water is needed for the yeast balloon. (a) False (b) True
10. 10.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) pour it down the sink (c) put it in your mouth (d) keep it for a month
11. 11.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is bigger (c) the balloon is smaller (d) it shrinks to nothing
12. 12.True or false: vinegar is something yeast does not need. (a) True (b) False
13. 13.True or false: warm water is something yeast needs. (a) False (b) True
14. 14.True or false: a magnet is not needed for the yeast balloon. (a) False (b) True
15. 15.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) size of the balloon (b) the amount of yeast (c) the water temperature
16. 16.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) dry yeast (c) a battery cell (d) sugar
17. 17.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) vinegar (d) sugar
18. 18.True or false: a magnet is something yeast does not need. (a) True (b) False
19. 19.True or false: sunlight is something yeast needs. (a) True (b) False
20. 20.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
21. 21.⚖️ 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 measure it (c) we change it
22. 22.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
23. 23.🔍 Which is the odd one out? (a) salt (b) sunlight (c) time (d) vinegar
24. 24.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it grows much faster (c) it bursts at once (d) it turns yellow
25. 25.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
26. 26.⚖️ 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 sugar (b) the water temperature (c) the amount of yeast (d) size of the balloon
27. 27.True or false: time is something yeast does not need. (a) True (b) False
28. 28.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) smoke (c) steam (d) carbon dioxide gas
29. 29.📘 What is yeast? (a) a kind of salt (b) a tiny living fungus (c) a kind of stone (d) a kind of sugar
30. 30.🔍 Which is the odd one out? (a) sugar (b) time (c) vinegar (d) warm water
31. 31.🍞 Which of these is something yeast needs? (a) sunlight (b) a magnet (c) time (d) vinegar
32. 32.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to wash dishes (c) to colour rice (d) to make bread rise
33. 33.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
34. 34.True or false: sugar is something yeast does not need. (a) True (b) False
35. 35.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) a battery cell (c) a mirror (d) a comb
36. 36.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it grows faster (c) it glows (d) the yeast is killed
37. 37.⚖️ 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 measure it (c) we keep it the same
38. 38.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) sugar (c) a small bottle (d) dry yeast
39. 39.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold makes it pink (c) cold slows yeast down (d) cold water is heavy
40. 40.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) sugar (c) turmeric powder (d) dry yeast

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