Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 69 · 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) salt (b) vinegar (c) a magnet (d) time
2. 2.True or false: sugar is needed for the yeast balloon. (a) False (b) True
3. 3.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
4. 4.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
5. 5.⚖️ 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
6. 6.True or false: a magnet is something yeast needs. (a) True (b) False
7. 7.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) the balloon is bigger (c) it turns to bread (d) it shrinks to nothing
8. 8.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
9. 9.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
10. 10.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is what we measure. (a) True (b) False
11. 11.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) put it in your mouth (c) keep it for a month (d) pour it down the sink
12. 12.⚖️ 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) False (b) True
13. 13.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold water is heavy (c) cold makes it pink (d) cold kills sugar
14. 14.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a magnet (d) a balloon
15. 15.True or false: warm water is something yeast does not need. (a) True (b) False
16. 16.⚖️ 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) True (b) False
17. 17.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
18. 18.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
19. 19.🛟 The water for the yeast should be ___. (a) very salty (b) boiling hot (c) warm, not hot (d) ice cold
20. 20.True or false: vinegar is something yeast does not need. (a) False (b) True
21. 21.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) a mirror (d) warm water
22. 22.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to colour it (c) to make it heavy (d) to make it sweet
23. 23.🔍 Which is the odd one out? (a) sugar (b) salt (c) warm water (d) time
24. 24.⚖️ 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 change it (b) we keep it the same (c) we measure it
25. 25.⚖️ 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 measure it (b) we change it (c) we keep it the same
26. 26.⚖️ 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 measure it (c) we keep it the same
27. 27.🔍 Which is the odd one out? (a) sugar (b) salt (c) vinegar (d) sunlight
28. 28.⚖️ 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 amount of sugar (c) the amount of water (d) the water temperature
29. 29.True or false: a small bottle is needed for the yeast balloon. (a) True (b) False
30. 30.⚖️ 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
31. 31.True or false: sunlight is something yeast needs. (a) False (b) True
32. 32.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
33. 33.True or false: a comb is not needed for the yeast balloon. (a) False (b) True
34. 34.📘 What is yeast? (a) a kind of sugar (b) a kind of stone (c) a tiny living fungus (d) a kind of salt
35. 35.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) a comb (c) turmeric powder (d) a paper clip
36. 36.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows much faster (c) it grows very little (d) it turns yellow
37. 37.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the same bottles (b) size of the balloon (c) the amount of sugar (d) the amount of yeast
38. 38.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is what we measure. (a) False (b) True
39. 39.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it turns to sugar (c) the yeast is killed (d) it glows
40. 40.⚖️ 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

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