Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 848 · 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.True or false: warm water is something yeast needs. (a) True (b) False
2. 2.⚖️ 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 same bottles (c) size of the balloon (d) the water temperature
3. 3.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
4. 4.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold water is heavy (c) cold kills sugar (d) cold slows yeast down
5. 5.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is the one thing we change. (a) True (b) False
6. 6.⚖️ 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 water (b) the amount of yeast (c) size of the balloon (d) the amount of sugar
7. 7.🍞 Which of these is something yeast does not need? (a) warm water (b) vinegar (c) sugar (d) time
8. 8.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) a magnet (c) warm water (d) sugar
9. 9.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is bigger (c) the balloon is smaller (d) it shrinks to nothing
10. 10.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a comb (c) a paper clip (d) sugar
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 keep it the same (b) we measure it (c) we change it
12. 12.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) pour it down the sink (c) keep it for a month (d) put it in your mouth
13. 13.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to make it heavy (c) to colour it (d) it is food for yeast
14. 14.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it bursts at once (c) it grows very little (d) it grows much faster
15. 15.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) a paper clip (d) sugar
16. 16.⚖️ 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 water
17. 17.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) warm water (c) a magnet (d) a battery cell
18. 18.🔍 Which is the odd one out? (a) time (b) vinegar (c) sugar (d) warm water
19. 19.True or false: sugar is needed for the yeast balloon. (a) False (b) True
20. 20.⚖️ 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
21. 21.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
22. 22.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) sugar (c) dry yeast (d) a paper clip
23. 23.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
24. 24.🔍 Which is the odd one out? (a) sugar (b) time (c) sunlight (d) warm water
25. 25.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
26. 26.True or false: salt is something yeast needs. (a) True (b) False
27. 27.⚖️ 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 change it (b) we keep it the same (c) we measure it
28. 28.🔍 Which is the odd one out? (a) salt (b) vinegar (c) time (d) a magnet
29. 29.⚖️ 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
30. 30.True or false: a magnet is something yeast needs. (a) True (b) False
31. 31.🛟 The water for the yeast should be ___. (a) very salty (b) ice cold (c) warm, not hot (d) boiling hot
32. 32.🧺 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 battery cell
33. 33.🍞 Which of these is something yeast does not need? (a) sunlight (b) warm water (c) time (d) sugar
34. 34.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it glows (c) it grows faster (d) the yeast is killed
35. 35.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
36. 36.🍞 Which of these is something yeast needs? (a) salt (b) sugar (c) vinegar (d) sunlight
37. 37.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
38. 38.🧺 Which of these is not needed for the yeast balloon? (a) a mirror (b) sugar (c) dry yeast (d) a small bottle
39. 39.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) a comb (c) a balloon (d) dry yeast
40. 40.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a paper clip (c) a battery cell (d) a balloon

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