Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 575 · 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? What do we do with “the amount of yeast”? (a) we keep it the same (b) we change it (c) we measure it
2. 2.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) very salty (d) warm, not hot
3. 3.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
4. 4.True or false: a balloon is not needed for the yeast balloon. (a) False (b) True
5. 5.🍞 Which of these is something yeast needs? (a) sunlight (b) time (c) salt (d) vinegar
6. 6.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) warm water (c) a small bottle (d) a paper clip
7. 7.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) warm water (c) a balloon (d) turmeric powder
8. 8.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) size of the balloon (b) the water temperature (c) the amount of sugar
9. 9.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) sugar (c) a magnet (d) a small bottle
10. 10.🔍 Which is the odd one out? (a) salt (b) vinegar (c) warm water (d) a magnet
11. 11.🍞 Which of these is something yeast does not need? (a) vinegar (b) warm water (c) sugar (d) time
12. 12.🍞 Which of these is something yeast needs? (a) salt (b) vinegar (c) sunlight (d) sugar
13. 13.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a comb (c) sugar (d) dry yeast
14. 14.True or false: a comb is needed for the yeast balloon. (a) True (b) False
15. 15.True or false: salt is something yeast does not need. (a) True (b) False
16. 16.🔍 Which is the odd one out? (a) vinegar (b) sugar (c) a magnet (d) sunlight
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.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
19. 19.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a balloon (c) a comb (d) a small bottle
20. 20.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) it shrinks to nothing (c) it turns to bread (d) the balloon is bigger
21. 21.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
22. 22.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is what we measure. (a) False (b) True
23. 23.🔮 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
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 amount of yeast (b) the water temperature (c) size of the balloon
25. 25.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
26. 26.⚖️ 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 measure it (b) we keep it the same (c) we change it
27. 27.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
28. 28.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) size of the balloon (b) the water temperature (c) the same bottles
29. 29.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) dry yeast (c) a small bottle (d) warm water
30. 30.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) size of the balloon (b) the amount of yeast (c) the water temperature (d) the amount of sugar
31. 31.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
32. 32.🔍 Which is the odd one out? (a) time (b) sunlight (c) salt (d) a magnet
33. 33.True or false: sugar is something yeast needs. (a) True (b) False
34. 34.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
35. 35.True or false: vinegar is something yeast does not need. (a) False (b) True
36. 36.🍞 Which of these is something yeast needs? (a) warm water (b) vinegar (c) sunlight (d) a magnet
37. 37.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows much faster (c) it bursts at once (d) it grows very little
38. 38.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
39. 39.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is what we measure. (a) False (b) True
40. 40.⚖️ 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 keep it the same (b) we measure it (c) we change it

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