Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 249 · 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 is the odd one out? (a) sunlight (b) time (c) a magnet (d) vinegar
2. 2.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows very little (c) it bursts at once (d) it grows much faster
3. 3.⚖️ 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 change it (b) we keep it the same (c) we measure it
4. 4.True or false: salt is something yeast does not need. (a) True (b) False
5. 5.🔍 Which is the odd one out? (a) a magnet (b) sunlight (c) vinegar (d) warm water
6. 6.🔍 Which is the odd one out? (a) warm water (b) time (c) sunlight (d) sugar
7. 7.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) a magnet (d) sugar
8. 8.⚖️ 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
9. 9.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
10. 10.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is smaller (c) the balloon is bigger (d) it shrinks to nothing
11. 11.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) put it in your mouth (c) pour it down the sink (d) throw it at a wall
12. 12.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a balloon (c) a paper clip (d) warm water
13. 13.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
14. 14.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
15. 15.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a paper clip (c) a comb (d) warm water
16. 16.⚖️ 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
17. 17.⚖️ 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
18. 18.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of water”? (a) we change it (b) we keep it the same (c) we measure it
19. 19.True or false: a battery cell is needed for the yeast balloon. (a) False (b) True
20. 20.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a mirror (c) dry yeast (d) a paper clip
21. 21.🍞 Which of these is something yeast does not need? (a) sugar (b) vinegar (c) time (d) warm water
22. 22.True or false: warm water is something yeast does not need. (a) True (b) False
23. 23.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) warm water (c) a mirror (d) dry yeast
24. 24.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
25. 25.⚖️ 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 sugar (c) the amount of water (d) the amount of yeast
26. 26.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
27. 27.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a small bottle (c) sugar (d) a magnet
28. 28.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is kept the same. (a) True (b) False
29. 29.🛟 The water for the yeast should be ___. (a) ice cold (b) boiling hot (c) very salty (d) warm, not hot
30. 30.🔍 Which is the odd one out? (a) a magnet (b) warm water (c) time (d) sugar
31. 31.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
32. 32.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
33. 33.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to make it sweet (c) to colour it (d) to make it heavy
34. 34.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a small bottle (c) sugar (d) a paper clip
35. 35.True or false: salt is something yeast needs. (a) False (b) True
36. 36.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) dry yeast (c) a comb (d) a balloon
37. 37.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
38. 38.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
39. 39.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is what we measure. (a) False (b) True
40. 40.🍞 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

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