Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 704 · 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.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) carbon dioxide gas (c) smoke (d) air from outside
2. 2.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) size of the balloon (b) the water temperature (c) the same bottles (d) the amount of sugar
3. 3.🛟 The water for the yeast should be ___. (a) warm, not hot (b) very salty (c) ice cold (d) boiling hot
4. 4.⚖️ 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
5. 5.True or false: a comb is needed for the yeast balloon. (a) True (b) False
6. 6.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) warm water (c) a magnet (d) sugar
7. 7.🔮 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
8. 8.True or false: time is something yeast does not need. (a) True (b) False
9. 9.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a balloon (c) a comb (d) dry yeast
10. 10.True or false: a mirror is not needed for the yeast balloon. (a) False (b) True
11. 11.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
12. 12.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a small bottle (c) a mirror (d) warm water
13. 13.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) warm water (c) dry yeast (d) a balloon
14. 14.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a small bottle (c) a balloon (d) a comb
15. 15.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to colour it (c) it is food for yeast (d) to make it heavy
16. 16.🍞 Which of these is something yeast needs? (a) salt (b) vinegar (c) time (d) sunlight
17. 17.⚖️ 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 measure it (b) we keep it the same (c) we change it
18. 18.🧺 Do we need dry yeast 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? Which of these is kept the same? (a) size of the balloon (b) the amount of sugar (c) the water temperature
20. 20.🔍 Which is the odd one out? (a) sugar (b) time (c) warm water (d) salt
21. 21.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) sugar (c) a comb (d) a paper clip
22. 22.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
23. 23.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is kept the same. (a) False (b) True
24. 24.🧺 Which of these is needed for the yeast balloon? (a) dry yeast (b) a paper clip (c) a mirror (d) a magnet
25. 25.🔍 Which is the odd one out? (a) sunlight (b) warm water (c) a magnet (d) salt
26. 26.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
27. 27.🍞 Which of these is something yeast needs? (a) sunlight (b) salt (c) vinegar (d) sugar
28. 28.True or false: warm water is something yeast needs. (a) False (b) True
29. 29.🔍 Which is the odd one out? (a) time (b) vinegar (c) salt (d) a magnet
30. 30.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a magnet (c) a small bottle (d) a mirror
31. 31.🍞 Which of these is something yeast needs? (a) vinegar (b) sunlight (c) warm water (d) a magnet
32. 32.🔍 Which is the odd one out? (a) warm water (b) sugar (c) time (d) a magnet
33. 33.True or false: sunlight is something yeast needs. (a) True (b) False
34. 34.🍞 Which of these is something yeast does not need? (a) time (b) salt (c) sugar (d) warm water
35. 35.True or false: sunlight is something yeast does not need. (a) True (b) False
36. 36.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) it shrinks to nothing (c) the balloon is bigger (d) it turns to bread
37. 37.🛟 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
38. 38.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
39. 39.True or false: a paper clip is needed for the yeast balloon. (a) False (b) True
40. 40.True or false: sugar is needed for the yeast balloon. (a) True (b) False

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