Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 776 · 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.True or false: time is something yeast needs. (a) False (b) True
2. 2.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
3. 3.🔍 Which is the odd one out? (a) sunlight (b) a magnet (c) sugar (d) vinegar
4. 4.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is the one thing we change. (a) False (b) True
5. 5.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) steam (c) air from outside (d) carbon dioxide gas
6. 6.True or false: a magnet is something yeast does not need. (a) True (b) False
7. 7.⚖️ 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) False (b) True
8. 8.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
9. 9.🍞 Which of these is something yeast needs? (a) vinegar (b) salt (c) sunlight (d) sugar
10. 10.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
11. 11.🧺 Which of these is needed for the yeast balloon? (a) dry yeast (b) turmeric powder (c) a mirror (d) a battery cell
12. 12.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
13. 13.⚖️ 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 change it (b) we keep it the same (c) we measure it
14. 14.🛟 The water for the yeast should be ___. (a) warm, not hot (b) ice cold (c) very salty (d) boiling hot
15. 15.⚖️ 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
16. 16.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) throw it at a wall (c) put it in your mouth (d) keep it for a month
17. 17.⚖️ 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) False (b) True
18. 18.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a mirror (c) a small bottle (d) a balloon
19. 19.🔍 Which is the odd one out? (a) salt (b) a magnet (c) vinegar (d) time
20. 20.True or false: warm water is something yeast does not need. (a) False (b) True
21. 21.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it bursts at once (c) it grows much faster (d) it grows very little
22. 22.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to colour rice (c) to wash dishes (d) to make bread rise
23. 23.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the amount of yeast (b) the water temperature (c) size of the balloon
24. 24.🔮 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
25. 25.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold kills sugar (c) cold water is heavy (d) cold slows yeast down
26. 26.⚖️ 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 water (b) the water temperature (c) size of the balloon (d) the amount of sugar
27. 27.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) a magnet (d) warm water
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 water”? (a) we measure it (b) we keep it the same (c) we change it
29. 29.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a magnet (c) a balloon (d) sugar
30. 30.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is the one thing we change. (a) True (b) False
31. 31.True or false: a comb is not needed for the yeast balloon. (a) True (b) False
32. 32.🍞 Which of these is something yeast needs? (a) salt (b) vinegar (c) time (d) sunlight
33. 33.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
34. 34.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is kept the same. (a) False (b) True
35. 35.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a paper clip (c) a small bottle (d) dry yeast
36. 36.True or false: a battery cell is not needed for the yeast balloon. (a) False (b) True
37. 37.🔍 Which is the odd one out? (a) warm water (b) time (c) sunlight (d) sugar
38. 38.⚖️ 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) False (b) True
39. 39.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to colour it (c) to make it heavy (d) to make it sweet
40. 40.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a paper clip (c) a battery cell (d) a balloon

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