Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 217 · 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.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) air from outside (c) carbon dioxide gas (d) steam
2. 2.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to make bread rise (c) to wash dishes (d) to colour rice
3. 3.True or false: a paper clip is not needed for the yeast balloon. (a) False (b) True
4. 4.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) throw it at a wall (c) keep it for a month (d) pour it down the sink
5. 5.🛟 The water for the yeast should be ___. (a) boiling hot (b) very salty (c) warm, not hot (d) ice cold
6. 6.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) sugar (c) a magnet (d) a paper clip
7. 7.🔍 Which is the odd one out? (a) sugar (b) warm water (c) salt (d) time
8. 8.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it heavy (c) to make it sweet (d) it is food for yeast
9. 9.True or false: a mirror is not needed for the yeast balloon. (a) True (b) False
10. 10.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) turmeric powder (c) a magnet (d) a small bottle
11. 11.⚖️ 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 amount of yeast (c) the amount of sugar (d) the water temperature
12. 12.🔍 Which is the odd one out? (a) a magnet (b) vinegar (c) salt (d) time
13. 13.🔮 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
14. 14.🧺 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
15. 15.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold makes it pink (c) cold kills sugar (d) cold slows yeast down
16. 16.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is what we measure. (a) True (b) False
17. 17.⚖️ 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 change it (b) we measure it (c) we keep it the same
18. 18.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) salt (d) warm water
19. 19.⚖️ 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
20. 20.⚖️ 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
21. 21.⚖️ 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 same bottles
22. 22.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
23. 23.True or false: warm water is something yeast needs. (a) False (b) True
24. 24.⚖️ 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
25. 25.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) sugar (c) a battery cell (d) dry yeast
26. 26.True or false: salt is something yeast needs. (a) False (b) True
27. 27.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a battery cell (c) turmeric powder (d) dry yeast
28. 28.🔍 Which is the odd one out? (a) warm water (b) vinegar (c) sugar (d) time
29. 29.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
30. 30.⚖️ 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
31. 31.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
32. 32.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) the balloon is bigger (c) it shrinks to nothing (d) it turns to bread
33. 33.🍞 Which of these is something yeast needs? (a) a magnet (b) sunlight (c) salt (d) sugar
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.True or false: a small bottle is needed for the yeast balloon. (a) False (b) True
36. 36.⚖️ 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
37. 37.⚖️ 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
38. 38.⚖️ 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
39. 39.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) warm water (c) dry yeast (d) a balloon
40. 40.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) warm water (c) a balloon (d) a paper clip

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