Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 138 · 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.🔮 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
2. 2.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
3. 3.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
4. 4.🔍 Which is the odd one out? (a) warm water (b) a magnet (c) sugar (d) time
5. 5.True or false: a mirror is not needed for the yeast balloon. (a) True (b) False
6. 6.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) sugar (c) a mirror (d) dry yeast
7. 7.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
8. 8.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
9. 9.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
10. 10.⚖️ 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) False (b) True
11. 11.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a comb (c) a small bottle (d) a mirror
12. 12.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
13. 13.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
14. 14.🛟 The water for the yeast should be ___. (a) very salty (b) boiling hot (c) ice cold (d) warm, not hot
15. 15.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) warm water (c) a comb (d) dry yeast
16. 16.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a mirror (c) sugar (d) a paper clip
17. 17.🔍 Which is the odd one out? (a) sugar (b) time (c) warm water (d) salt
18. 18.🛟 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
19. 19.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) it shrinks to nothing (c) it turns to bread (d) the balloon is smaller
20. 20.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is the one thing we change. (a) False (b) True
21. 21.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
22. 22.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
23. 23.🔍 Which is the odd one out? (a) sunlight (b) sugar (c) time (d) warm water
24. 24.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
25. 25.🔍 Which is the odd one out? (a) time (b) vinegar (c) warm water (d) sugar
26. 26.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a magnet (c) a balloon (d) warm water
27. 27.⚖️ 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 measure it (b) we change it (c) we keep it the same
28. 28.True or false: sugar is needed for the yeast balloon. (a) False (b) True
29. 29.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
30. 30.True or false: vinegar is something yeast needs. (a) False (b) True
31. 31.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) a magnet (d) warm water
32. 32.🍞 Which of these is something yeast needs? (a) vinegar (b) sunlight (c) a magnet (d) sugar
33. 33.True or false: a balloon is needed for the yeast balloon. (a) True (b) False
34. 34.True or false: a comb is not needed for the yeast balloon. (a) False (b) True
35. 35.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
36. 36.🔍 Which is the odd one out? (a) salt (b) warm water (c) sunlight (d) a magnet
37. 37.📘 What is yeast? (a) a kind of sugar (b) a kind of stone (c) a tiny living fungus (d) a kind of salt
38. 38.True or false: salt is something yeast does not need. (a) False (b) True
39. 39.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) sunlight (d) warm water
40. 40.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold water is heavy (c) cold slows yeast down (d) cold kills sugar

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