Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 52 · 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.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to colour it (c) it is food for yeast (d) to make it sweet
2. 2.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) the yeast is killed (c) it grows faster (d) it glows
3. 3.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a balloon (c) a comb (d) a battery cell
4. 4.🛟 The water for the yeast should be ___. (a) boiling hot (b) very salty (c) ice cold (d) warm, not hot
5. 5.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
6. 6.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
7. 7.🛟 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
8. 8.True or false: a paper clip is needed for the yeast balloon. (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 water temperature”? (a) we keep it the same (b) we measure it (c) we change it
10. 10.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a magnet (c) turmeric powder (d) warm water
11. 11.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a paper clip (c) a comb (d) a small bottle
12. 12.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
13. 13.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is what we measure. (a) True (b) False
14. 14.⚖️ 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 keep it the same (c) we change it
15. 15.⚖️ 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
16. 16.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) sugar (c) a balloon (d) a small bottle
17. 17.🔍 Which is the odd one out? (a) time (b) warm water (c) sunlight (d) sugar
18. 18.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (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 the one thing we change? (a) size of the balloon (b) the water temperature (c) the amount of yeast (d) the amount of sugar
20. 20.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a balloon (c) a comb (d) warm water
21. 21.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) turmeric powder (c) a magnet (d) dry yeast
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 very little (d) it grows much faster
23. 23.🔍 Which is the odd one out? (a) a magnet (b) sunlight (c) salt (d) warm water
24. 24.True or false: salt is something yeast needs. (a) False (b) True
25. 25.⚖️ 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) True (b) False
26. 26.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
27. 27.True or false: a battery cell is not needed for the yeast balloon. (a) True (b) False
28. 28.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is the one thing we change. (a) True (b) False
29. 29.🔍 Which is the odd one out? (a) warm water (b) sugar (c) time (d) vinegar
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) the amount of water (b) the amount of sugar (c) size of the balloon (d) the same bottles
31. 31.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) a magnet (d) a balloon
32. 32.🔍 Which is the odd one out? (a) sunlight (b) salt (c) sugar (d) a magnet
33. 33.True or false: sugar is something yeast needs. (a) False (b) True
34. 34.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is bigger (c) it shrinks to nothing (d) the balloon is smaller
35. 35.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is the one thing we change. (a) False (b) True
36. 36.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
37. 37.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) time (d) a magnet
38. 38.True or false: salt is something yeast does not need. (a) False (b) True
39. 39.🧺 Which of these is not needed for the yeast balloon? (a) turmeric powder (b) dry yeast (c) sugar (d) warm water
40. 40.True or false: a magnet is needed for the yeast balloon. (a) True (b) False

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