Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 945 · 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.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a paper clip (c) sugar (d) a balloon
2. 2.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
3. 3.🛟 The water for the yeast should be ___. (a) very salty (b) boiling hot (c) warm, not hot (d) ice cold
4. 4.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
5. 5.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
6. 6.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) sugar (c) a magnet (d) dry yeast
7. 7.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) sugar (c) dry yeast (d) a paper clip
8. 8.🔍 Which is the odd one out? (a) sunlight (b) a magnet (c) warm water (d) vinegar
9. 9.True or false: time is something yeast needs. (a) True (b) False
10. 10.🔍 Which is the odd one out? (a) time (b) a magnet (c) warm water (d) sugar
11. 11.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
12. 12.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
13. 13.⚖️ 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
14. 14.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) sugar (d) a comb
15. 15.🍞 Which of these is something yeast needs? (a) salt (b) vinegar (c) sunlight (d) time
16. 16.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it bursts at once (c) it grows very little (d) it turns yellow
17. 17.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) warm water (d) sunlight
18. 18.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) air from outside (c) smoke (d) steam
19. 19.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
20. 20.🔮 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
21. 21.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it glows (c) the yeast is killed (d) it turns to sugar
22. 22.🔍 Which is the odd one out? (a) sugar (b) warm water (c) time (d) vinegar
23. 23.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) warm water (d) vinegar
24. 24.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to make bread rise (c) to clean floors (d) to wash dishes
25. 25.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is the one thing we change. (a) True (b) False
26. 26.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is what we measure. (a) True (b) False
27. 27.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a battery cell (c) warm water (d) a small bottle
28. 28.⚖️ 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 amount of yeast (c) the water temperature (d) the amount of sugar
29. 29.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to colour it (c) to make it heavy (d) it is food for yeast
30. 30.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) throw it at a wall (c) put it in your mouth (d) keep it for a month
31. 31.🔍 Which is the odd one out? (a) sugar (b) a magnet (c) sunlight (d) vinegar
32. 32.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
33. 33.True or false: a mirror is needed for the yeast balloon. (a) False (b) True
34. 34.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
35. 35.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
36. 36.True or false: a comb is needed for the yeast balloon. (a) False (b) True
37. 37.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) sugar (c) a mirror (d) dry yeast
38. 38.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
39. 39.True or false: a magnet is not needed for the yeast balloon. (a) True (b) False
40. 40.True or false: sugar is needed for the yeast balloon. (a) False (b) True

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