Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 521 · 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 needed for the yeast balloon? (a) a balloon (b) turmeric powder (c) a mirror (d) a paper clip
2. 2.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) time (d) sunlight
3. 3.True or false: sugar is something yeast needs. (a) False (b) True
4. 4.⚖️ 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) the amount of sugar (c) the amount of water (d) size of the balloon
5. 5.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the amount of water (b) size of the balloon (c) the water temperature
6. 6.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
7. 7.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it grows faster (c) it turns to sugar (d) it glows
8. 8.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold water is heavy (c) cold makes it pink (d) cold slows yeast down
9. 9.True or false: a battery cell is needed for the yeast balloon. (a) False (b) True
10. 10.📘 What is yeast? (a) a kind of sugar (b) a kind of stone (c) a kind of salt (d) a tiny living fungus
11. 11.⚖️ 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 measure it (b) we keep it the same (c) we change it
12. 12.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) a battery cell (d) a small bottle
13. 13.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
14. 14.🔍 Which is the odd one out? (a) sugar (b) time (c) salt (d) warm water
15. 15.⚖️ 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
16. 16.🔍 Which is the odd one out? (a) vinegar (b) time (c) sugar (d) warm water
17. 17.🔮 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
18. 18.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it heavy (c) it is food for yeast (d) to make it sweet
19. 19.True or false: a mirror is needed for the yeast balloon. (a) False (b) True
20. 20.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
21. 21.True or false: turmeric powder is needed for the yeast balloon. (a) True (b) False
22. 22.🛟 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
23. 23.⚖️ 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
24. 24.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) it turns to bread (c) the balloon is smaller (d) it shrinks to nothing
25. 25.🔍 Which is the odd one out? (a) sugar (b) sunlight (c) vinegar (d) a magnet
26. 26.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) warm water (c) a balloon (d) a paper clip
27. 27.True or false: a small bottle is needed for the yeast balloon. (a) True (b) False
28. 28.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
29. 29.True or false: salt is something yeast needs. (a) True (b) False
30. 30.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is kept the same. (a) False (b) True
31. 31.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
32. 32.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
33. 33.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
34. 34.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
35. 35.🛟 The water for the yeast should be ___. (a) very salty (b) ice cold (c) boiling hot (d) warm, not hot
36. 36.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
37. 37.🔍 Which is the odd one out? (a) sunlight (b) a magnet (c) vinegar (d) warm water
38. 38.True or false: time is something yeast needs. (a) True (b) False
39. 39.🍞 Which of these is something yeast needs? (a) sunlight (b) warm water (c) salt (d) a magnet
40. 40.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) a mirror (d) a small bottle

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