Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 193 · 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.🛟 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
2. 2.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) warm water (c) a magnet (d) sugar
3. 3.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
4. 4.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
5. 5.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
6. 6.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a comb (c) dry yeast (d) sugar
7. 7.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the same bottles (b) the water temperature (c) size of the balloon
8. 8.⚖️ 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 keep it the same (b) we change it (c) we measure it
9. 9.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
10. 10.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) air from outside (c) smoke (d) steam
11. 11.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is kept the same. (a) True (b) False
12. 12.🔍 Which is the odd one out? (a) a magnet (b) salt (c) sunlight (d) warm water
13. 13.True or false: a mirror is not needed for the yeast balloon. (a) False (b) True
14. 14.⚖️ 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 measure it (b) we keep it the same (c) we change it
15. 15.True or false: warm water is something yeast needs. (a) False (b) True
16. 16.🧺 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 battery cell
17. 17.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is the one thing we change. (a) True (b) False
18. 18.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows very little (c) it turns yellow (d) it grows much faster
19. 19.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a comb (c) a magnet (d) a balloon
20. 20.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) sugar (c) warm water (d) turmeric powder
21. 21.True or false: sugar is something yeast does not need. (a) False (b) True
22. 22.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a balloon (c) a paper clip (d) dry yeast
23. 23.True or false: sugar is needed for the yeast balloon. (a) True (b) False
24. 24.🧺 Which of these is not needed for the yeast balloon? (a) turmeric powder (b) sugar (c) dry yeast (d) a balloon
25. 25.⚖️ 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) size of the balloon (c) the water temperature (d) the same bottles
26. 26.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
27. 27.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it glows (c) it grows faster (d) the yeast is killed
28. 28.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
29. 29.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a balloon (c) warm water (d) a mirror
30. 30.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) sugar (c) dry yeast (d) a mirror
31. 31.🍞 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
32. 32.🛟 The water for the yeast should be ___. (a) boiling hot (b) warm, not hot (c) ice cold (d) very salty
33. 33.🔍 Which is the odd one out? (a) sugar (b) time (c) salt (d) warm water
34. 34.True or false: time is something yeast needs. (a) True (b) False
35. 35.🔮 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
36. 36.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
37. 37.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
38. 38.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
39. 39.🍞 Which of these is something yeast needs? (a) a magnet (b) sunlight (c) vinegar (d) warm water
40. 40.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed

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