Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 917 · 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.🍞 Which of these is something yeast needs? (a) sunlight (b) vinegar (c) warm water (d) a magnet
2. 2.🔍 Which is the odd one out? (a) time (b) warm water (c) a magnet (d) sugar
3. 3.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
4. 4.⚖️ 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
5. 5.True or false: vinegar is something yeast does not need. (a) True (b) False
6. 6.📘 What is yeast? (a) a kind of salt (b) a kind of stone (c) a kind of sugar (d) a tiny living fungus
7. 7.🔍 Which is the odd one out? (a) vinegar (b) warm water (c) sunlight (d) salt
8. 8.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to colour it (c) it is food for yeast (d) to make it heavy
9. 9.🧺 Which of these is not needed for the yeast balloon? (a) a mirror (b) sugar (c) warm water (d) dry yeast
10. 10.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
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) size of the balloon (b) the water temperature (c) the amount of yeast (d) the same bottles
12. 12.🧺 Do we need a magnet 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 measure it (b) we keep it the same (c) we change it
14. 14.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
15. 15.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) very salty (d) warm, not hot
16. 16.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
17. 17.⚖️ 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 keep it the same (b) we measure it (c) we change it
18. 18.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) sugar (d) a magnet
19. 19.True or false: a comb is needed for the yeast balloon. (a) True (b) False
20. 20.🛟 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
21. 21.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
22. 22.🔍 Which is the odd one out? (a) sugar (b) time (c) warm water (d) sunlight
23. 23.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
24. 24.🍞 Which of these is something yeast needs? (a) salt (b) vinegar (c) sugar (d) a magnet
25. 25.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) it shrinks to nothing (c) the balloon is smaller (d) the balloon is bigger
26. 26.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a paper clip (c) warm water (d) dry yeast
27. 27.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
28. 28.🔍 Which is the odd one out? (a) sugar (b) salt (c) warm water (d) time
29. 29.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
30. 30.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold kills sugar (c) cold makes it pink (d) cold slows yeast down
31. 31.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) warm water (c) a comb (d) sugar
32. 32.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to clean floors (c) to make bread rise (d) to wash dishes
33. 33.🔮 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
34. 34.⚖️ 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
35. 35.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) sugar (c) a small bottle (d) a magnet
36. 36.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) warm water (c) a paper clip (d) turmeric powder
37. 37.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
38. 38.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a small bottle (c) turmeric powder (d) warm water
39. 39.⚖️ 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 keep it the same (b) we measure it (c) we change it
40. 40.🍞 Which of these is something yeast does not need? (a) salt (b) sugar (c) warm water (d) time

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