Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 168 · 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 not needed for the yeast balloon? (a) sugar (b) a small bottle (c) a mirror (d) a balloon
2. 2.⚖️ 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
3. 3.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of sugar”? (a) we change it (b) we measure it (c) we keep it the same
4. 4.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) keep it for a month (c) throw it at a wall (d) pour it down the sink
5. 5.⚖️ 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 amount of water (b) size of the balloon (c) the amount of yeast (d) the water temperature
6. 6.🍞 Which of these is something yeast needs? (a) vinegar (b) a magnet (c) sunlight (d) warm water
7. 7.True or false: a magnet is something yeast needs. (a) True (b) False
8. 8.True or false: a mirror is not needed for the yeast balloon. (a) False (b) True
9. 9.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a small bottle (c) dry yeast (d) a paper clip
10. 10.🔍 Which is the odd one out? (a) sugar (b) time (c) salt (d) warm water
11. 11.🧺 Which of these is needed for the yeast balloon? (a) a small bottle (b) a mirror (c) a magnet (d) a battery cell
12. 12.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
13. 13.🔮 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
14. 14.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) warm water (c) a small bottle (d) dry yeast
15. 15.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a mirror (c) a small bottle (d) sugar
16. 16.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) steam (c) carbon dioxide gas (d) smoke
17. 17.🔍 Which is the odd one out? (a) a magnet (b) vinegar (c) sugar (d) sunlight
18. 18.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold kills sugar (c) cold makes it pink (d) cold slows yeast down
19. 19.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it glows (c) the yeast is killed (d) it grows faster
20. 20.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) a magnet (d) sugar
21. 21.🛟 The water for the yeast should be ___. (a) ice cold (b) warm, not hot (c) very salty (d) boiling hot
22. 22.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
23. 23.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
24. 24.⚖️ 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) size of the balloon (c) the amount of water
25. 25.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
26. 26.🔍 Which is the odd one out? (a) time (b) sugar (c) sunlight (d) warm water
27. 27.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a magnet (c) turmeric powder (d) sugar
28. 28.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
29. 29.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to colour rice (c) to wash dishes (d) to make bread rise
30. 30.🔍 Which is the odd one out? (a) vinegar (b) time (c) salt (d) sunlight
31. 31.⚖️ 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
32. 32.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a magnet (c) a mirror (d) dry yeast
33. 33.⚖️ 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
34. 34.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a battery cell (c) dry yeast (d) warm water
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 yeast”? (a) we change it (b) we measure it (c) we keep it the same
36. 36.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
37. 37.🔍 Which is the odd one out? (a) warm water (b) salt (c) sunlight (d) vinegar
38. 38.🧺 Which of these is not needed for the yeast balloon? (a) a battery cell (b) warm water (c) a balloon (d) sugar
39. 39.True or false: warm water is something yeast does not need. (a) True (b) False
40. 40.📘 What is yeast? (a) a kind of stone (b) a kind of sugar (c) a tiny living fungus (d) a kind of salt

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