Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 467 · 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 “size of the balloon”? (a) we keep it the same (b) we change it (c) we measure it
2. 2.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) warm water (c) a small bottle (d) a comb
3. 3.🔍 Which is the odd one out? (a) a magnet (b) warm water (c) time (d) sugar
4. 4.⚖️ 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
5. 5.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
6. 6.🔮 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
7. 7.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) put it in your mouth (c) throw it at a wall (d) pour it down the sink
8. 8.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows much faster (c) it turns yellow (d) it grows very little
9. 9.🔍 Which is the odd one out? (a) time (b) vinegar (c) sugar (d) warm water
10. 10.⚖️ 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 change it (b) we keep it the same (c) we measure it
11. 11.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is the one thing we change. (a) True (b) False
12. 12.🧺 Which of these is needed for the yeast balloon? (a) dry yeast (b) a magnet (c) a mirror (d) a comb
13. 13.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is kept the same. (a) True (b) False
14. 14.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
15. 15.🍞 Which of these is something yeast needs? (a) salt (b) a magnet (c) vinegar (d) warm water
16. 16.🍞 Which of these is something yeast does not need? (a) vinegar (b) warm water (c) sugar (d) time
17. 17.🔍 Which is the odd one out? (a) time (b) sugar (c) warm water (d) salt
18. 18.True or false: a magnet is not needed for the yeast balloon. (a) True (b) False
19. 19.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) warm water (c) dry yeast (d) a magnet
20. 20.⚖️ 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 yeast (c) size of the balloon (d) the water temperature
21. 21.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a mirror (c) turmeric powder (d) a small bottle
22. 22.🔍 Which is the odd one out? (a) sunlight (b) vinegar (c) time (d) salt
23. 23.🍞 Which of these is something yeast needs? (a) a magnet (b) sugar (c) vinegar (d) salt
24. 24.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) the balloon is smaller (c) it turns to bread (d) it shrinks to nothing
25. 25.🛟 The water for the yeast should be ___. (a) boiling hot (b) very salty (c) warm, not hot (d) ice cold
26. 26.⚖️ 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 keep it the same (c) we measure it
27. 27.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to make it heavy (c) it is food for yeast (d) to colour it
28. 28.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to wash dishes (c) to make bread rise (d) to colour rice
29. 29.True or false: turmeric powder is not needed for the yeast balloon. (a) True (b) False
30. 30.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
31. 31.⚖️ 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
32. 32.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a magnet (c) warm water (d) dry yeast
33. 33.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold slows yeast down (c) cold makes it pink (d) cold water is heavy
34. 34.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
35. 35.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
36. 36.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) turmeric powder (c) a small bottle (d) warm water
37. 37.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) warm water (d) salt
38. 38.True or false: sunlight is something yeast does not need. (a) True (b) False
39. 39.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) a small bottle (c) dry yeast (d) warm water
40. 40.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) air from outside (c) steam (d) carbon dioxide gas

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