Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 998 · 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.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) pour it down the sink (c) throw it at a wall (d) keep it for a month
2. 2.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
3. 3.⚖️ 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 measure it (b) we keep it the same (c) we change it
4. 4.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) sugar (c) a battery cell (d) turmeric powder
5. 5.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a mirror (c) warm water (d) a paper clip
6. 6.🔍 Which is the odd one out? (a) vinegar (b) sunlight (c) a magnet (d) time
7. 7.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
8. 8.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is what we measure. (a) True (b) False
9. 9.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
10. 10.🔮 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
11. 11.⚖️ 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 measure it (c) we keep it the same
12. 12.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) size of the balloon (b) the amount of water (c) the same bottles (d) the amount of yeast
13. 13.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to clean floors (c) to wash dishes (d) to colour rice
14. 14.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
15. 15.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) warm water (c) dry yeast (d) sugar
16. 16.🍞 Which of these is something yeast needs? (a) sunlight (b) a magnet (c) sugar (d) vinegar
17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a balloon (c) turmeric powder (d) a small bottle
18. 18.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
19. 19.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) steam (c) smoke (d) carbon dioxide gas
20. 20.🍞 Which of these is something yeast needs? (a) a magnet (b) vinegar (c) sunlight (d) warm water
21. 21.True or false: salt is something yeast does not need. (a) True (b) False
22. 22.🔍 Which is the odd one out? (a) a magnet (b) warm water (c) salt (d) sunlight
23. 23.⚖️ 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 measure it (b) we change it (c) we keep it the same
24. 24.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it grows faster (c) it turns to sugar (d) it glows
25. 25.🍞 Which of these is something yeast does not need? (a) time (b) vinegar (c) sugar (d) warm water
26. 26.🔍 Which is the odd one out? (a) sunlight (b) time (c) warm water (d) sugar
27. 27.⚖️ 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
28. 28.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
29. 29.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
30. 30.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) a small bottle (d) a paper clip
31. 31.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
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 sugar”? (a) we measure it (b) we change it (c) we keep it the same
33. 33.⚖️ 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 yeast (b) the water temperature (c) size of the balloon (d) the same bottles
34. 34.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
35. 35.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
36. 36.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) dry yeast (c) a mirror (d) a balloon
37. 37.True or false: sugar is something yeast needs. (a) True (b) False
38. 38.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) very salty (d) warm, not hot
39. 39.🍞 Which of these is something yeast does not need? (a) warm water (b) a magnet (c) sugar (d) time
40. 40.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed

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