Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 208 · 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.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to clean floors (c) to make bread rise (d) to colour rice
2. 2.⚖️ 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
3. 3.True or false: a balloon is not needed for the yeast balloon. (a) False (b) True
4. 4.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) the yeast is killed (c) it grows faster (d) it glows
5. 5.True or false: sunlight is something yeast needs. (a) False (b) True
6. 6.True or false: warm water is something yeast does not need. (a) True (b) False
7. 7.🔍 Which is the odd one out? (a) sugar (b) time (c) sunlight (d) warm water
8. 8.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
9. 9.🍞 Which of these is something yeast needs? (a) sunlight (b) vinegar (c) a magnet (d) warm water
10. 10.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
11. 11.⚖️ 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 yeast (c) the water temperature
12. 12.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
13. 13.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) smoke (c) steam (d) air from outside
14. 14.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a battery cell (b) sugar (c) warm water (d) dry yeast
15. 15.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
16. 16.⚖️ 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
17. 17.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
18. 18.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it grows very little (c) it bursts at once (d) it turns yellow
19. 19.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) a balloon (c) sugar (d) a mirror
20. 20.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is what we measure. (a) False (b) True
21. 21.⚖️ 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) False (b) True
22. 22.⚖️ 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 same bottles (b) the amount of water (c) the water temperature (d) the amount of sugar
23. 23.True or false: a mirror is not needed for the yeast balloon. (a) True (b) False
24. 24.🍞 Which of these is something yeast does not need? (a) time (b) sunlight (c) sugar (d) warm water
25. 25.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
26. 26.🍞 Which of these is something yeast does not need? (a) warm water (b) a magnet (c) time (d) sugar
27. 27.True or false: a mirror is needed for the yeast balloon. (a) False (b) True
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) dry yeast (c) a magnet (d) warm water
29. 29.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a magnet (c) a small bottle (d) a battery cell
30. 30.True or false: a magnet is something yeast needs. (a) True (b) False
31. 31.True or false: a paper clip is not needed for the yeast balloon. (a) False (b) True
32. 32.🍞 Which of these is something yeast needs? (a) sunlight (b) a magnet (c) sugar (d) vinegar
33. 33.True or false: time is something yeast does not need. (a) False (b) True
34. 34.🔍 Which is the odd one out? (a) time (b) sugar (c) warm water (d) salt
35. 35.🔮 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
36. 36.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
37. 37.🔍 Which is the odd one out? (a) salt (b) vinegar (c) a magnet (d) warm water
38. 38.⚖️ 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
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 the one thing we change. (a) True (b) False
40. 40.⚖️ 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 yeast (b) size of the balloon (c) the same bottles (d) the amount of sugar

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