Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 533 · 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 (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it grows faster (c) the yeast is killed (d) it turns to sugar
2. 2.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
3. 3.True or false: turmeric powder is not needed for the yeast balloon. (a) True (b) False
4. 4.🍞 Which of these is something yeast does not need? (a) salt (b) time (c) sugar (d) warm water
5. 5.🛟 The water for the yeast should be ___. (a) ice cold (b) very salty (c) warm, not hot (d) boiling hot
6. 6.True or false: sugar is something yeast does not need. (a) False (b) True
7. 7.⚖️ 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
8. 8.🍞 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
9. 9.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
10. 10.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) put it in your mouth (c) throw it at a wall (d) keep it for a month
11. 11.🔍 Which is the odd one out? (a) vinegar (b) sugar (c) time (d) warm water
12. 12.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
13. 13.🧺 Which of these is needed for the yeast balloon? (a) sugar (b) turmeric powder (c) a magnet (d) a battery cell
14. 14.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) a battery cell (c) a comb (d) a mirror
15. 15.True or false: warm water is something yeast needs. (a) False (b) True
16. 16.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) sugar (d) sunlight
17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a magnet (c) a small bottle (d) sugar
18. 18.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is smaller (c) the balloon is bigger (d) it shrinks to nothing
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 small bottle (c) a comb (d) warm water
21. 21.⚖️ 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) False (b) True
22. 22.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it turns yellow (c) it bursts at once (d) it grows very little
23. 23.🍞 Which of these is something yeast needs? (a) salt (b) a magnet (c) sugar (d) vinegar
24. 24.🔍 Which is the odd one out? (a) warm water (b) a magnet (c) salt (d) sunlight
25. 25.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
26. 26.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
27. 27.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a small bottle (c) a mirror (d) warm water
28. 28.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) steam (c) air from outside (d) carbon dioxide gas
29. 29.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) a magnet (d) sugar
30. 30.🔍 Which is the odd one out? (a) sugar (b) time (c) warm water (d) sunlight
31. 31.⚖️ 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
32. 32.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) turmeric powder (c) a comb (d) a balloon
33. 33.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is kept the same. (a) True (b) False
34. 34.⚖️ 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
35. 35.⚖️ 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 measure it (c) we change it
36. 36.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold kills sugar (c) cold slows yeast down (d) cold makes it pink
37. 37.🍞 Which of these is something yeast needs? (a) time (b) a magnet (c) sunlight (d) vinegar
38. 38.True or false: a mirror is needed for the yeast balloon. (a) True (b) False
39. 39.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
40. 40.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed

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