Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 310 · 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.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) put it in your mouth (c) throw it at a wall (d) pour it down the sink
2. 2.🔍 Which is the odd one out? (a) sugar (b) sunlight (c) time (d) warm water
3. 3.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
4. 4.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
5. 5.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a paper clip (c) dry yeast (d) warm water
6. 6.True or false: sunlight is something yeast needs. (a) True (b) False
7. 7.🔍 Which is the odd one out? (a) warm water (b) salt (c) sugar (d) time
8. 8.🍞 Which of these is something yeast does not need? (a) sugar (b) sunlight (c) time (d) warm water
9. 9.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
10. 10.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a battery cell (c) warm water (d) dry yeast
11. 11.⚖️ 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 measure it (b) we keep it the same (c) we change it
12. 12.True or false: warm water is something yeast needs. (a) False (b) True
13. 13.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold water is heavy (c) cold slows yeast down (d) cold makes it pink
14. 14.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) steam (c) smoke (d) air from outside
15. 15.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it bursts at once (c) it grows much faster (d) it turns yellow
16. 16.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
17. 17.⚖️ 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 keep it the same (b) we change it (c) we measure it
18. 18.🔍 Which is the odd one out? (a) a magnet (b) sunlight (c) salt (d) sugar
19. 19.🔍 Which is the odd one out? (a) sugar (b) time (c) warm water (d) vinegar
20. 20.True or false: vinegar is something yeast needs. (a) True (b) False
21. 21.True or false: sugar is needed for the yeast balloon. (a) False (b) True
22. 22.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
23. 23.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
24. 24.⚖️ 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) size of the balloon (c) the amount of sugar (d) the amount of yeast
25. 25.True or false: a mirror is needed for the yeast balloon. (a) True (b) False
26. 26.🍞 Which of these is something yeast needs? (a) sunlight (b) a magnet (c) salt (d) warm water
27. 27.🔍 Which is the odd one out? (a) sugar (b) warm water (c) time (d) a magnet
28. 28.⚖️ 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) the water temperature (c) the amount of water (d) size of the balloon
29. 29.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to colour it (c) to make it sweet (d) to make it heavy
30. 30.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
31. 31.🍞 Which of these is something yeast does not need? (a) salt (b) sugar (c) warm water (d) time
32. 32.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
33. 33.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) a mirror (c) a magnet (d) a comb
34. 34.🧺 Which of these is needed for the yeast balloon? (a) sugar (b) a paper clip (c) a battery cell (d) a magnet
35. 35.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) warm water (c) dry yeast (d) sugar
36. 36.True or false: a magnet is something yeast needs. (a) True (b) False
37. 37.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
38. 38.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a magnet (c) a paper clip (d) a small bottle
39. 39.⚖️ 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
40. 40.🔍 Which is the odd one out? (a) a magnet (b) salt (c) vinegar (d) warm water

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