Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 440 · 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.⚖️ 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
2. 2.📘 What is yeast? (a) a kind of stone (b) a kind of salt (c) a kind of sugar (d) a tiny living fungus
3. 3.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) very salty (d) warm, not hot
4. 4.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
5. 5.🔍 Which is the odd one out? (a) time (b) warm water (c) sugar (d) vinegar
6. 6.True or false: vinegar is something yeast needs. (a) True (b) False
7. 7.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
8. 8.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it turns yellow (c) it bursts at once (d) it grows much faster
9. 9.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
10. 10.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) dry yeast (c) a mirror (d) a magnet
11. 11.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
12. 12.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) sugar (c) a comb (d) a magnet
13. 13.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
14. 14.True or false: sunlight is something yeast does not need. (a) False (b) True
15. 15.🍞 Which of these is something yeast needs? (a) time (b) a magnet (c) salt (d) sunlight
16. 16.🍞 Which of these is something yeast needs? (a) sunlight (b) vinegar (c) a magnet (d) sugar
17. 17.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) smoke (c) carbon dioxide gas (d) air from outside
18. 18.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold makes it pink (c) cold kills sugar (d) cold slows yeast down
19. 19.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it glows (c) it turns to sugar (d) the yeast is killed
20. 20.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
21. 21.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
22. 22.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a balloon (c) a mirror (d) a paper clip
23. 23.True or false: a paper clip is needed for the yeast balloon. (a) False (b) True
24. 24.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a magnet (c) warm water (d) sugar
25. 25.⚖️ 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 measure it (b) we keep it the same (c) we change it
26. 26.🍞 Which of these is something yeast does not need? (a) vinegar (b) warm water (c) sugar (d) time
27. 27.True or false: a battery cell is needed for the yeast balloon. (a) True (b) False
28. 28.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) pour it down the sink (c) keep it for a month (d) throw it at a wall
29. 29.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to colour it (c) to make it sweet (d) to make it heavy
30. 30.⚖️ 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 change it (c) we measure it
31. 31.🔍 Which is the odd one out? (a) a magnet (b) warm water (c) vinegar (d) sunlight
32. 32.🔮 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
33. 33.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the water temperature (b) the amount of sugar (c) size of the balloon (d) the same bottles
34. 34.True or false: a balloon is needed for the yeast balloon. (a) False (b) True
35. 35.True or false: warm water is something yeast needs. (a) False (b) True
36. 36.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the water temperature (b) the same bottles (c) size of the balloon
37. 37.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
38. 38.🔍 Which is the odd one out? (a) a magnet (b) salt (c) time (d) sunlight
39. 39.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
40. 40.🍞 Which of these is something yeast does not need? (a) warm water (b) a magnet (c) time (d) sugar

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