Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 898 · 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? Which of these is kept the same? (a) the water temperature (b) the same bottles (c) size of the balloon
2. 2.🔍 Which is the odd one out? (a) vinegar (b) sugar (c) a magnet (d) salt
3. 3.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a paper clip (c) a balloon (d) turmeric powder
4. 4.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold slows yeast down (c) cold kills sugar (d) cold makes it pink
5. 5.🛟 The water for the yeast should be ___. (a) ice cold (b) boiling hot (c) warm, not hot (d) very salty
6. 6.⚖️ 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 keep it the same (b) we change it (c) we measure it
7. 7.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a small bottle (c) a battery cell (d) a comb
8. 8.⚖️ 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 amount of sugar (c) the same bottles (d) the water temperature
9. 9.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is what we measure. (a) True (b) False
10. 10.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a mirror (c) sugar (d) turmeric powder
11. 11.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
12. 12.🍞 Which of these is something yeast needs? (a) vinegar (b) sunlight (c) time (d) salt
13. 13.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a paper clip (c) a small bottle (d) warm water
14. 14.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is the one thing we change. (a) True (b) False
15. 15.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a comb (c) warm water (d) dry yeast
16. 16.True or false: salt is something yeast does not need. (a) False (b) True
17. 17.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to clean floors (c) to make bread rise (d) to colour rice
18. 18.True or false: a battery cell is not needed for the yeast balloon. (a) True (b) False
19. 19.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
20. 20.⚖️ 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 water temperature (c) the amount of yeast
21. 21.🔍 Which is the odd one out? (a) sunlight (b) time (c) vinegar (d) a magnet
22. 22.⚖️ 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
23. 23.🔍 Which is the odd one out? (a) sugar (b) time (c) vinegar (d) warm water
24. 24.🔮 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
25. 25.⚖️ 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) False (b) True
26. 26.🔍 Which is the odd one out? (a) warm water (b) time (c) sunlight (d) sugar
27. 27.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is bigger (c) the balloon is smaller (d) it turns to bread
28. 28.🔍 Which is the odd one out? (a) vinegar (b) a magnet (c) warm water (d) sunlight
29. 29.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a mirror (c) dry yeast (d) a magnet
30. 30.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
31. 31.🛟 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
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 yeast”? (a) we measure it (b) we keep it the same (c) we change it
33. 33.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) dry yeast (c) a balloon (d) a magnet
34. 34.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a battery cell (c) a paper clip (d) warm water
35. 35.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a mirror (c) a small bottle (d) dry yeast
36. 36.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
37. 37.⚖️ 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 amount of water (c) the same bottles (d) size of the balloon
38. 38.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to colour it (c) it is food for yeast (d) to make it sweet
39. 39.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it grows very little (c) it turns yellow (d) it bursts at once
40. 40.True or false: a battery cell is needed for the yeast balloon. (a) True (b) False

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