Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 870 · 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 of these is something yeast does not need? (a) sugar (b) time (c) warm water (d) sunlight
2. 2.⚖️ 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
3. 3.True or false: warm water is something yeast needs. (a) False (b) True
4. 4.True or false: a paper clip is needed for the yeast balloon. (a) False (b) True
5. 5.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it bursts at once (c) it grows very little (d) it grows much faster
6. 6.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a magnet (c) dry yeast (d) a paper clip
7. 7.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) keep it for a month (c) put it in your mouth (d) throw it at a wall
8. 8.True or false: sugar is something yeast needs. (a) False (b) True
9. 9.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) sugar (c) a small bottle (d) a battery cell
10. 10.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
11. 11.🍞 Which of these is something yeast needs? (a) salt (b) vinegar (c) time (d) a magnet
12. 12.🔍 Which is the odd one out? (a) sugar (b) a magnet (c) time (d) warm water
13. 13.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is the one thing we change. (a) True (b) False
14. 14.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it grows faster (c) it glows (d) it turns to sugar
15. 15.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) warm, not hot (d) very salty
16. 16.⚖️ 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
17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) sugar (c) a magnet (d) warm water
18. 18.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) it shrinks to nothing (c) the balloon is smaller (d) the balloon is bigger
19. 19.True or false: a balloon is not needed for the yeast balloon. (a) False (b) True
20. 20.⚖️ 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
21. 21.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a balloon (c) dry yeast (d) a mirror
22. 22.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) warm water (c) a comb (d) a small bottle
23. 23.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold makes it pink (c) cold water is heavy (d) cold kills sugar
24. 24.⚖️ 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 sugar (b) size of the balloon (c) the water temperature (d) the amount of water
25. 25.True or false: turmeric powder is needed for the yeast balloon. (a) False (b) True
26. 26.True or false: a balloon is needed for the yeast balloon. (a) True (b) False
27. 27.True or false: a paper clip is not needed for the yeast balloon. (a) False (b) True
28. 28.⚖️ 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 change it (b) we measure it (c) we keep it the same
29. 29.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to colour it (c) to make it sweet (d) it is food for yeast
30. 30.⚖️ 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) False (b) True
31. 31.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) time (d) salt
32. 32.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a small bottle (c) warm water (d) a magnet
33. 33.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of yeast”? (a) we measure it (b) we change it (c) we keep it the same
34. 34.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to clean floors (c) to colour rice (d) to wash dishes
35. 35.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) smoke (c) steam (d) carbon dioxide gas
36. 36.⚖️ 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 keep it the same (c) we measure it
37. 37.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
38. 38.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
39. 39.🍞 Which of these is something yeast does not need? (a) vinegar (b) sugar (c) time (d) warm water
40. 40.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed

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