Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 274 · 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.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
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.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a small bottle (c) a paper clip (d) a comb
4. 4.True or false: warm water is needed for the yeast balloon. (a) False (b) True
5. 5.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a mirror (c) sugar (d) a comb
6. 6.⚖️ 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 yeast (b) the amount of sugar (c) the amount of water (d) the water temperature
7. 7.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a mirror (c) a comb (d) a balloon
8. 8.🛟 The water for the yeast should be ___. (a) very salty (b) warm, not hot (c) boiling hot (d) ice cold
9. 9.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) put it in your mouth (c) keep it for a month (d) throw it at a wall
10. 10.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) a balloon (c) warm water (d) a small bottle
11. 11.⚖️ 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 water temperature (c) size of the balloon (d) the amount of yeast
12. 12.⚖️ 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 change it (c) we keep it the same
13. 13.🔍 Which is the odd one out? (a) warm water (b) sugar (c) time (d) salt
14. 14.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
15. 15.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
16. 16.True or false: a comb is not needed for the yeast balloon. (a) True (b) False
17. 17.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) the yeast is killed (c) it glows (d) it turns to sugar
18. 18.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
19. 19.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) steam (c) air from outside (d) smoke
20. 20.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
21. 21.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is kept the same. (a) True (b) False
22. 22.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it turns yellow (c) it grows much faster (d) it grows very little
23. 23.True or false: vinegar is something yeast needs. (a) False (b) True
24. 24.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) dry yeast (c) a small bottle (d) a comb
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 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? True or false: the amount of water is kept the same. (a) False (b) True
27. 27.🔍 Which is the odd one out? (a) sugar (b) sunlight (c) time (d) warm water
28. 28.🍞 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
29. 29.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) turmeric powder (b) warm water (c) dry yeast (d) sugar
30. 30.True or false: a paper clip is needed for the yeast balloon. (a) True (b) False
31. 31.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
32. 32.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is kept the same. (a) False (b) True
33. 33.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a battery cell (c) a magnet (d) warm water
34. 34.True or false: sugar is needed for the yeast balloon. (a) True (b) False
35. 35.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) a small bottle (c) warm water (d) sugar
36. 36.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
37. 37.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) warm water (c) a balloon (d) a comb
38. 38.True or false: turmeric powder is needed for the yeast balloon. (a) False (b) True
39. 39.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a small bottle (c) dry yeast (d) a mirror
40. 40.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it

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