Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 174 · 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.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) dry yeast (c) a balloon (d) sugar
2. 2.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold slows yeast down (c) cold water is heavy (d) cold makes it pink
3. 3.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a small bottle (c) turmeric powder (d) a mirror
4. 4.True or false: salt is something yeast does not need. (a) True (b) False
5. 5.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
6. 6.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to wash dishes (c) to make bread rise (d) to clean floors
7. 7.True or false: a small bottle is needed for the yeast balloon. (a) False (b) True
8. 8.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) vinegar (d) warm water
9. 9.⚖️ 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
10. 10.🛟 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
11. 11.📘 What is yeast? (a) a kind of salt (b) a kind of sugar (c) a kind of stone (d) a tiny living fungus
12. 12.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is smaller (c) it shrinks to nothing (d) the balloon is bigger
13. 13.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a balloon (c) a small bottle (d) a paper clip
14. 14.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) a comb (c) a battery cell (d) a magnet
15. 15.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
16. 16.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
17. 17.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
18. 18.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) sugar (d) a magnet
19. 19.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it sweet (c) to make it heavy (d) it is food for yeast
20. 20.🧺 Which of these is needed for the yeast balloon? (a) a balloon (b) a comb (c) a mirror (d) a battery cell
21. 21.🔍 Which is the odd one out? (a) vinegar (b) a magnet (c) sunlight (d) warm water
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: a magnet is something yeast does not need. (a) True (b) False
24. 24.🔍 Which is the odd one out? (a) sugar (b) warm water (c) salt (d) time
25. 25.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) sugar (c) warm water (d) a paper clip
26. 26.🍞 Which of these is something yeast needs? (a) a magnet (b) sugar (c) salt (d) vinegar
27. 27.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) warm water (d) turmeric powder
29. 29.🧺 Do we need turmeric powder 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 “the amount of sugar”? (a) we measure it (b) we change it (c) we keep it the same
31. 31.True or false: a magnet is something yeast needs. (a) True (b) False
32. 32.True or false: warm water is something yeast needs. (a) True (b) False
33. 33.🍞 Which of these is something yeast needs? (a) salt (b) a magnet (c) sunlight (d) time
34. 34.🍞 Which of these is something yeast does not need? (a) a magnet (b) warm water (c) sugar (d) time
35. 35.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it turns yellow (c) it bursts at once (d) it grows much faster
36. 36.True or false: warm water is needed for the yeast balloon. (a) False (b) True
37. 37.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) time (d) salt
38. 38.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
39. 39.🔍 Which is the odd one out? (a) vinegar (b) time (c) warm water (d) sugar
40. 40.⚖️ 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) True (b) False

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