Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 113 · 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.⚖️ 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
2. 2.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
3. 3.⚖️ 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 change it (b) we measure it (c) we keep it the same
4. 4.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to wash dishes (c) to clean floors (d) to make bread rise
5. 5.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a paper clip (c) dry yeast (d) a magnet
6. 6.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a small bottle (c) warm water (d) a mirror
7. 7.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) warm water (c) a comb (d) turmeric powder
8. 8.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
9. 9.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold makes it pink (c) cold kills sugar (d) cold water is heavy
10. 10.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) sugar (c) a magnet (d) turmeric powder
11. 11.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
12. 12.🍞 Which of these is something yeast does not need? (a) time (b) sunlight (c) sugar (d) warm water
13. 13.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) steam (c) smoke (d) carbon dioxide gas
14. 14.True or false: warm water is needed for the yeast balloon. (a) False (b) True
15. 15.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
16. 16.⚖️ 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
17. 17.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows much faster (c) it bursts at once (d) it grows very little
18. 18.⚖️ 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
19. 19.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it turns to sugar (c) it grows faster (d) the yeast is killed
20. 20.⚖️ 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
21. 21.🛟 The water for the yeast should be ___. (a) very salty (b) warm, not hot (c) boiling hot (d) ice cold
22. 22.🔮 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 bigger (d) the balloon is smaller
23. 23.True or false: turmeric powder is not needed for the yeast balloon. (a) True (b) False
24. 24.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a comb (c) sugar (d) dry yeast
25. 25.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
26. 26.⚖️ 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
27. 27.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is kept the same. (a) True (b) False
28. 28.True or false: a magnet is something yeast does not need. (a) True (b) False
29. 29.🔍 Which is the odd one out? (a) sunlight (b) warm water (c) vinegar (d) salt
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 keep it the same (b) we measure it (c) we change it
31. 31.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
32. 32.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
33. 33.🔍 Which is the odd one out? (a) vinegar (b) time (c) sunlight (d) salt
34. 34.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
35. 35.🍞 Which of these is something yeast needs? (a) time (b) salt (c) a magnet (d) vinegar
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 same bottles
37. 37.🍞 Which of these is something yeast needs? (a) vinegar (b) a magnet (c) salt (d) sugar
38. 38.⚖️ 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 change it (c) we measure it
39. 39.⚖️ 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 water temperature (c) the amount of yeast (d) the amount of sugar
40. 40.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it

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