Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 773 · 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.⚖️ 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 measure it (b) we keep it the same (c) we change it
2. 2.🔍 Which is the odd one out? (a) salt (b) sunlight (c) vinegar (d) sugar
3. 3.🔮 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
4. 4.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
5. 5.⚖️ 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 change it (c) we keep it the same
6. 6.🔍 Which is the odd one out? (a) time (b) warm water (c) salt (d) sugar
7. 7.🛟 The water for the yeast should be ___. (a) ice cold (b) very salty (c) warm, not hot (d) boiling hot
8. 8.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) a magnet (d) warm water
9. 9.True or false: warm water is needed for the yeast balloon. (a) False (b) True
10. 10.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
11. 11.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) put it in your mouth (c) pour it down the sink (d) throw it at a wall
12. 12.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
13. 13.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a battery cell (c) a balloon (d) a magnet
14. 14.True or false: sugar is something yeast does not need. (a) False (b) True
15. 15.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
16. 16.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) warm water (c) a balloon (d) turmeric powder
17. 17.⚖️ 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 amount of yeast (c) the water temperature (d) the amount of sugar
18. 18.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
19. 19.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
20. 20.True or false: sunlight is something yeast does not need. (a) False (b) True
21. 21.True or false: a magnet is something yeast needs. (a) True (b) False
22. 22.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
23. 23.🍞 Which of these is something yeast needs? (a) sugar (b) salt (c) vinegar (d) sunlight
24. 24.⚖️ 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) False (b) True
25. 25.🍞 Which of these is something yeast does not need? (a) time (b) sunlight (c) warm water (d) sugar
26. 26.⚖️ 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
27. 27.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
28. 28.🔍 Which is the odd one out? (a) sunlight (b) salt (c) a magnet (d) time
29. 29.⚖️ 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 change it (b) we keep it the same (c) we measure it
30. 30.🔍 Which is the odd one out? (a) sugar (b) time (c) a magnet (d) warm water
31. 31.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a balloon (c) a mirror (d) a small bottle
32. 32.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
33. 33.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
34. 34.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it turns to sugar (c) it grows faster (d) the yeast is killed
35. 35.True or false: time is something yeast does not need. (a) False (b) True
36. 36.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it heavy (c) to make it sweet (d) it is food for yeast
37. 37.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is kept the same. (a) True (b) False
38. 38.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
39. 39.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) air from outside (c) carbon dioxide gas (d) smoke
40. 40.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) sugar (d) salt

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