Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 35 · 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.🔮 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
2. 2.🔮 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
3. 3.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) a small bottle (d) a comb
4. 4.🔍 Which is the odd one out? (a) time (b) vinegar (c) a magnet (d) sunlight
5. 5.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold water is heavy (c) cold kills sugar (d) cold slows yeast down
6. 6.True or false: a balloon is needed for the yeast balloon. (a) True (b) False
7. 7.⚖️ 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 measure it (c) we change it
8. 8.🍞 Which of these is something yeast needs? (a) salt (b) time (c) sunlight (d) a magnet
9. 9.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a paper clip (c) a balloon (d) a magnet
10. 10.🍞 Which of these is something yeast needs? (a) sugar (b) sunlight (c) salt (d) vinegar
11. 11.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
12. 12.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
13. 13.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
14. 14.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) sugar (c) a mirror (d) a comb
15. 15.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
16. 16.⚖️ 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
17. 17.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
18. 18.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) dry yeast (c) sugar (d) turmeric powder
19. 19.⚖️ 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 water (b) size of the balloon (c) the water temperature
20. 20.🧺 Do we need a balloon 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? What do we do with “size of the balloon”? (a) we keep it the same (b) we change it (c) we measure it
22. 22.True or false: a battery cell is needed for the yeast balloon. (a) True (b) False
23. 23.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is what we measure. (a) False (b) True
24. 24.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
25. 25.🔍 Which is the odd one out? (a) time (b) sunlight (c) warm water (d) sugar
26. 26.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) a mirror (d) sugar
27. 27.⚖️ 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 keep it the same (c) we change it
28. 28.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the amount of yeast (b) size of the balloon (c) the same bottles (d) the amount of water
29. 29.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to clean floors (c) to make bread rise (d) to colour rice
30. 30.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
31. 31.⚖️ 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 keep it the same (c) we measure it
32. 32.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) turmeric powder (c) warm water (d) a small bottle
33. 33.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
34. 34.True or false: a paper clip is needed for the yeast balloon. (a) True (b) False
35. 35.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) it is food for yeast (c) to colour it (d) to make it sweet
36. 36.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
37. 37.🔍 Which is the odd one out? (a) a magnet (b) sunlight (c) sugar (d) vinegar
38. 38.🛟 The water for the yeast should be ___. (a) ice cold (b) very salty (c) boiling hot (d) warm, not hot
39. 39.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
40. 40.True or false: sugar is something yeast does not need. (a) False (b) True

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