Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 472 · 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.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a battery cell (c) warm water (d) a small bottle
2. 2.⚖️ 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 keep it the same (c) we measure it
3. 3.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) a small bottle (c) a balloon (d) dry yeast
4. 4.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold slows yeast down (c) cold water is heavy (d) cold makes it pink
5. 5.⚖️ 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 measure it (b) we keep it the same (c) we change it
6. 6.True or false: a battery cell is not needed for the yeast balloon. (a) False (b) True
7. 7.🔮 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
8. 8.True or false: a magnet is something yeast needs. (a) True (b) False
9. 9.⚖️ 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 change it (b) we keep it the same (c) we measure it
10. 10.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) sugar (d) sunlight
11. 11.⚖️ 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 change it (b) we measure it (c) we keep it the same
12. 12.True or false: a mirror is needed for the yeast balloon. (a) False (b) True
13. 13.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) put it in your mouth (c) throw it at a wall (d) pour it down the sink
14. 14.True or false: a magnet is not needed for the yeast balloon. (a) True (b) False
15. 15.🍞 Which of these is something yeast needs? (a) vinegar (b) a magnet (c) salt (d) warm water
16. 16.True or false: time is something yeast needs. (a) True (b) False
17. 17.⚖️ 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) False (b) True
18. 18.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
19. 19.⚖️ 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) True (b) False
20. 20.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a balloon (c) a mirror (d) a small bottle
21. 21.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
22. 22.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) steam (c) smoke (d) carbon dioxide gas
23. 23.🍞 Which of these is something yeast does not need? (a) warm water (b) a magnet (c) sugar (d) time
24. 24.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
25. 25.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it glows (c) the yeast is killed (d) it turns to sugar
26. 26.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
27. 27.⚖️ 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) False (b) True
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 amount of water (c) the water temperature
29. 29.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) it turns to bread (c) the balloon is smaller (d) it shrinks to nothing
30. 30.True or false: a mirror is not needed for the yeast balloon. (a) True (b) False
31. 31.🔍 Which is the odd one out? (a) sugar (b) time (c) vinegar (d) warm water
32. 32.⚖️ 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) False (b) True
33. 33.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
34. 34.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) warm, not hot (d) very salty
35. 35.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) warm water (c) a comb (d) sugar
36. 36.True or false: vinegar is something yeast needs. (a) False (b) True
37. 37.True or false: a paper clip is not needed for the yeast balloon. (a) False (b) True
38. 38.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a small bottle (c) turmeric powder (d) warm water
39. 39.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
40. 40.True or false: sugar is something yeast does not need. (a) True (b) False

Free science experiments lessons, practice and worksheets at talentjr.in/science-experiments-for-kids