Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 454 · 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) vinegar (b) time (c) salt (d) sunlight
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 water (b) the same bottles (c) size of the balloon (d) the water temperature
3. 3.True or false: vinegar is something yeast needs. (a) False (b) True
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 water”? (a) we keep it the same (b) we measure it (c) we change it
5. 5.🛟 The water for the yeast should be ___. (a) very salty (b) warm, not hot (c) ice cold (d) boiling hot
6. 6.⚖️ 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) False (b) True
7. 7.🍞 Which of these is something yeast needs? (a) vinegar (b) time (c) sunlight (d) salt
8. 8.🍞 Which of these is something yeast needs? (a) salt (b) warm water (c) vinegar (d) sunlight
9. 9.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
10. 10.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it turns to sugar (c) the yeast is killed (d) it grows faster
11. 11.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it grows much faster (c) it turns yellow (d) it bursts at once
12. 12.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is kept the same. (a) True (b) False
13. 13.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) carbon dioxide gas (c) steam (d) smoke
14. 14.⚖️ 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
15. 15.⚖️ 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 change it (b) we measure it (c) we keep it the same
16. 16.🔍 Which is the odd one out? (a) a magnet (b) vinegar (c) sunlight (d) warm water
17. 17.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) warm water (d) a magnet
18. 18.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the water temperature (b) the same bottles (c) the amount of water (d) size of the balloon
19. 19.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
20. 20.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a magnet (c) a balloon (d) dry yeast
21. 21.🧺 Which of these is needed for the yeast balloon? (a) dry yeast (b) a mirror (c) a paper clip (d) a battery cell
22. 22.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
23. 23.True or false: sugar is needed for the yeast balloon. (a) True (b) False
24. 24.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
25. 25.⚖️ 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 water temperature (c) the amount of yeast
26. 26.📘 What is yeast? (a) a kind of stone (b) a kind of sugar (c) a kind of salt (d) a tiny living fungus
27. 27.True or false: a magnet is something yeast needs. (a) True (b) False
28. 28.⚖️ 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
29. 29.True or false: sunlight is something yeast does not need. (a) True (b) False
30. 30.⚖️ 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 change it (b) we measure it (c) we keep it the same
31. 31.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) it turns to bread (c) the balloon is smaller (d) the balloon is bigger
32. 32.🍞 Why do we add sugar to the yeast? (a) to colour it (b) it is food for yeast (c) to make it sweet (d) to make it heavy
33. 33.True or false: sugar is something yeast needs. (a) True (b) False
34. 34.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) warm water (c) sugar (d) a magnet
35. 35.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
36. 36.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is the one thing we change. (a) False (b) True
37. 37.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a balloon (c) a battery cell (d) turmeric powder
38. 38.🔍 Which is the odd one out? (a) time (b) warm water (c) sunlight (d) sugar
39. 39.True or false: a paper clip is not needed for the yeast balloon. (a) False (b) True
40. 40.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed

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