Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 808 · 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.🔍 Which is the odd one out? (a) salt (b) sunlight (c) vinegar (d) time
2. 2.⚖️ 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
3. 3.⚖️ 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) size of the balloon (b) the amount of water (c) the same bottles (d) the water temperature
4. 4.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) steam (c) smoke (d) carbon dioxide gas
5. 5.⚖️ 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) the amount of sugar (c) the water temperature (d) size of the balloon
6. 6.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) the yeast is killed (c) it turns to sugar (d) it grows faster
7. 7.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
8. 8.🔍 Which is the odd one out? (a) sunlight (b) time (c) sugar (d) warm water
9. 9.⚖️ 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) the same bottles (c) size of the balloon
10. 10.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
11. 11.True or false: vinegar is something yeast does not need. (a) True (b) False
12. 12.⚖️ 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 measure it (b) we keep it the same (c) we change it
13. 13.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) it turns to bread (c) it shrinks to nothing (d) the balloon is smaller
14. 14.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is what we measure. (a) True (b) False
15. 15.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) sugar (d) a magnet
16. 16.🔍 Which is the odd one out? (a) time (b) sugar (c) warm water (d) vinegar
17. 17.⚖️ 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) True (b) False
18. 18.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a paper clip (c) sugar (d) warm water
19. 19.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a mirror (c) warm water (d) dry yeast
20. 20.🍞 Which of these is something yeast needs? (a) sunlight (b) a magnet (c) salt (d) warm water
21. 21.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
22. 22.True or false: sugar is something yeast does not need. (a) True (b) False
23. 23.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to make it sweet (c) to make it heavy (d) to colour it
24. 24.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) sugar (d) vinegar
25. 25.🍞 Which of these is something yeast needs? (a) a magnet (b) sugar (c) sunlight (d) vinegar
26. 26.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) dry yeast (c) a comb (d) warm water
27. 27.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) a balloon (c) dry yeast (d) a small bottle
28. 28.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) sugar (d) a magnet
29. 29.⚖️ 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 water (c) the water temperature
30. 30.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) sugar (c) a paper clip (d) warm water
31. 31.⚖️ 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 keep it the same (b) we change it (c) we measure it
32. 32.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it bursts at once (c) it turns yellow (d) it grows very little
33. 33.True or false: a magnet is needed for the yeast balloon. (a) False (b) True
34. 34.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
35. 35.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
36. 36.🔍 Which is the odd one out? (a) sunlight (b) vinegar (c) a magnet (d) sugar
37. 37.🔍 Which is the odd one out? (a) sunlight (b) salt (c) vinegar (d) warm water
38. 38.True or false: a small bottle is needed for the yeast balloon. (a) False (b) True
39. 39.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
40. 40.True or false: sugar is needed for the yeast balloon. (a) False (b) True

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