Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 123 · 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.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold kills sugar (c) cold makes it pink (d) cold water is heavy
2. 2.True or false: a balloon is needed for the yeast balloon. (a) False (b) True
3. 3.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) dry yeast (c) a paper clip (d) warm water
4. 4.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
5. 5.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) warm water (c) turmeric powder (d) a small bottle
6. 6.True or false: vinegar is something yeast does not need. (a) True (b) False
7. 7.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) sugar (d) a mirror
8. 8.🔮 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
9. 9.⚖️ 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
10. 10.⚖️ 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 water temperature (b) the amount of water (c) the amount of yeast (d) the same bottles
11. 11.⚖️ 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
12. 12.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
13. 13.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is what we measure. (a) False (b) True
14. 14.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to colour rice (c) to clean floors (d) to wash dishes
15. 15.True or false: a paper clip is needed for the yeast balloon. (a) False (b) True
16. 16.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) size of the balloon (b) the amount of water (c) the amount of yeast (d) the same bottles
17. 17.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) steam (c) air from outside (d) smoke
18. 18.🔮 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
19. 19.🔍 Which is the odd one out? (a) salt (b) sunlight (c) warm water (d) a magnet
20. 20.🔍 Which is the odd one out? (a) sunlight (b) a magnet (c) time (d) vinegar
21. 21.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) sugar (d) vinegar
22. 22.🔍 Which is the odd one out? (a) warm water (b) sugar (c) sunlight (d) time
23. 23.True or false: sugar is something yeast does not need. (a) False (b) True
24. 24.True or false: sunlight is something yeast needs. (a) True (b) False
25. 25.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
26. 26.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a paper clip (c) a balloon (d) sugar
27. 27.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
28. 28.🍞 Which of these is something yeast does not need? (a) sugar (b) a magnet (c) time (d) warm water
29. 29.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) pour it down the sink (c) keep it for a month (d) put it in your mouth
30. 30.🔍 Which is the odd one out? (a) sugar (b) a magnet (c) sunlight (d) vinegar
31. 31.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it turns yellow (c) it grows much faster (d) it grows very little
32. 32.True or false: warm water is something yeast needs. (a) True (b) False
33. 33.🍞 Which of these is something yeast does not need? (a) time (b) salt (c) sugar (d) warm water
34. 34.True or false: a paper clip is not needed for the yeast balloon. (a) True (b) False
35. 35.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a small bottle (c) a battery cell (d) warm water
36. 36.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
37. 37.⚖️ 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) True (b) False
38. 38.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a magnet (c) a small bottle (d) sugar
39. 39.⚖️ 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
40. 40.🔍 Which is the odd one out? (a) warm water (b) sugar (c) salt (d) time

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