Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 659 · 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.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
2. 2.🔍 Which is the odd one out? (a) time (b) warm water (c) sugar (d) a magnet
3. 3.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) a small bottle (d) turmeric powder
4. 4.True or false: vinegar is something yeast does not need. (a) False (b) True
5. 5.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) turmeric powder (c) a small bottle (d) a battery cell
6. 6.🛟 The water for the yeast should be ___. (a) warm, not hot (b) boiling hot (c) very salty (d) ice cold
7. 7.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a mirror (c) sugar (d) warm water
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) True (b) False
9. 9.True or false: sunlight is something yeast does not need. (a) False (b) True
10. 10.🍞 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
11. 11.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
12. 12.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it grows faster (c) the yeast is killed (d) it turns to sugar
13. 13.🍞 Which of these is something yeast does not need? (a) warm water (b) vinegar (c) time (d) sugar
14. 14.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) a small bottle (c) warm water (d) dry yeast
15. 15.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
16. 16.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a balloon (c) a comb (d) a paper clip
17. 17.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) smoke (c) steam (d) air from outside
18. 18.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
19. 19.⚖️ 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) the water temperature (b) the amount of water (c) the amount of yeast (d) size of the balloon
20. 20.🍞 Which of these is something yeast does not need? (a) a magnet (b) time (c) warm water (d) sugar
21. 21.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
22. 22.🍞 Which of these is something yeast needs? (a) warm water (b) a magnet (c) vinegar (d) salt
23. 23.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
24. 24.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) put it in your mouth (c) throw it at a wall (d) keep it for a month
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 yeast”? (a) we keep it the same (b) we measure it (c) we change it
26. 26.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
27. 27.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
28. 28.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
29. 29.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it heavy (c) to make it sweet (d) it is food for yeast
30. 30.⚖️ 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 keep it the same (c) we measure it
31. 31.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
32. 32.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) sugar (d) a paper clip
33. 33.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) dry yeast (c) a comb (d) warm water
34. 34.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) a comb (c) turmeric powder (d) a magnet
35. 35.⚖️ 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 keep it the same (b) we measure it (c) we change it
36. 36.True or false: a mirror is needed for the yeast balloon. (a) False (b) True
37. 37.🔍 Which is the odd one out? (a) sunlight (b) salt (c) vinegar (d) warm water
38. 38.🔮 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
39. 39.⚖️ 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) size of the balloon (c) the amount of water (d) the same bottles
40. 40.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed

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