Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 759 · 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 does not need it (b) yeast needs it
2. 2.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it turns yellow (c) it bursts at once (d) it grows very little
3. 3.True or false: a magnet is not needed for the yeast balloon. (a) True (b) False
4. 4.🛟 The water for the yeast should be ___. (a) boiling hot (b) very salty (c) ice cold (d) warm, not hot
5. 5.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is kept the same. (a) True (b) False
6. 6.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) pour it down the sink (c) keep it for a month (d) throw it at a wall
7. 7.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to make it sweet (c) it is food for yeast (d) to colour it
8. 8.⚖️ 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
9. 9.⚖️ 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 same bottles
10. 10.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) the balloon is bigger (c) it shrinks to nothing (d) it turns to bread
11. 11.🔍 Which is the odd one out? (a) sugar (b) time (c) warm water (d) a magnet
12. 12.🧺 Which of these is needed for the yeast balloon? (a) a balloon (b) a mirror (c) turmeric powder (d) a battery cell
13. 13.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold slows yeast down (c) cold water is heavy (d) cold makes it pink
14. 14.True or false: a magnet is something yeast does not need. (a) False (b) True
15. 15.⚖️ 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
16. 16.🍞 Which of these is something yeast does not need? (a) salt (b) warm water (c) time (d) sugar
17. 17.True or false: sunlight is something yeast needs. (a) True (b) False
18. 18.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
19. 19.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is kept the same. (a) False (b) True
20. 20.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it turns to sugar (c) it glows (d) the yeast is killed
21. 21.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) a magnet (d) warm water
22. 22.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
23. 23.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a paper clip (c) turmeric powder (d) sugar
24. 24.True or false: sugar is something yeast does not need. (a) False (b) True
25. 25.⚖️ 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
26. 26.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
27. 27.🔍 Which is the odd one out? (a) a magnet (b) salt (c) vinegar (d) sugar
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a paper clip (c) a small bottle (d) a balloon
29. 29.True or false: a paper clip is not needed for the yeast balloon. (a) True (b) False
30. 30.True or false: a mirror is not needed for the yeast balloon. (a) False (b) True
31. 31.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) steam (c) smoke (d) carbon dioxide gas
32. 32.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to clean floors (c) to wash dishes (d) to colour rice
33. 33.🔍 Which is the odd one out? (a) salt (b) time (c) vinegar (d) sunlight
34. 34.⚖️ 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 water temperature (c) the amount of yeast (d) the amount of water
35. 35.True or false: a balloon is not needed for the yeast balloon. (a) False (b) True
36. 36.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
37. 37.🔍 Which is the odd one out? (a) sunlight (b) sugar (c) warm water (d) time
38. 38.🔍 Which is the odd one out? (a) sunlight (b) vinegar (c) warm water (d) salt
39. 39.⚖️ 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
40. 40.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) warm water (c) turmeric powder (d) a paper clip

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