Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 295 · 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.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) it shrinks to nothing (c) it turns to bread (d) the balloon is bigger
2. 2.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
3. 3.⚖️ 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
4. 4.True or false: sunlight is something yeast needs. (a) True (b) False
5. 5.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a battery cell (c) a balloon (d) warm water
6. 6.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
7. 7.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to make it sweet (c) it is food for yeast (d) to colour it
8. 8.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it grows much faster (c) it bursts at once (d) it turns yellow
9. 9.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is the one thing we change. (a) True (b) False
10. 10.⚖️ 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
11. 11.True or false: warm water is something yeast needs. (a) False (b) True
12. 12.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) turmeric powder (b) sugar (c) a balloon (d) a small bottle
13. 13.⚖️ 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 amount of sugar (c) the amount of water (d) the water temperature
14. 14.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
15. 15.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a balloon (c) a magnet (d) dry yeast
16. 16.True or false: a battery cell is needed for the yeast balloon. (a) True (b) False
17. 17.🔍 Which is the odd one out? (a) vinegar (b) sunlight (c) time (d) salt
18. 18.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
19. 19.📘 What is yeast? (a) a tiny living fungus (b) a kind of salt (c) a kind of stone (d) a kind of sugar
20. 20.🔍 Which is the odd one out? (a) vinegar (b) sugar (c) sunlight (d) a magnet
21. 21.🧺 Which of these is needed for the yeast balloon? (a) sugar (b) a mirror (c) a comb (d) a battery cell
22. 22.🍞 Which of these is something yeast needs? (a) a magnet (b) sunlight (c) warm water (d) salt
23. 23.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
24. 24.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) carbon dioxide gas (c) air from outside (d) steam
25. 25.True or false: dry yeast is needed for the yeast balloon. (a) False (b) True
26. 26.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) a small bottle (c) warm water (d) dry yeast
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 sugar”? (a) we measure it (b) we keep it the same (c) we change it
28. 28.🔍 Which is the odd one out? (a) vinegar (b) time (c) warm water (d) sugar
29. 29.True or false: time is something yeast needs. (a) True (b) False
30. 30.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
31. 31.🍞 Which of these is something yeast needs? (a) vinegar (b) a magnet (c) sugar (d) salt
32. 32.🍞 Which of these is something yeast needs? (a) time (b) salt (c) sunlight (d) a magnet
33. 33.🔍 Which is the odd one out? (a) sugar (b) sunlight (c) warm water (d) time
34. 34.True or false: a battery cell is not needed for the yeast balloon. (a) False (b) True
35. 35.True or false: turmeric powder is needed for the yeast balloon. (a) True (b) False
36. 36.⚖️ 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 sugar
37. 37.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) the yeast is killed (c) it grows faster (d) it turns to sugar
38. 38.True or false: a mirror is not needed for the yeast balloon. (a) True (b) False
39. 39.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
40. 40.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is kept the same. (a) True (b) False

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