Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 463 · 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.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to colour rice (c) to wash dishes (d) to clean floors
2. 2.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
3. 3.🔍 Which is the odd one out? (a) vinegar (b) a magnet (c) sugar (d) sunlight
4. 4.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
5. 5.🛟 The water for the yeast should be ___. (a) ice cold (b) boiling hot (c) warm, not hot (d) very salty
6. 6.⚖️ 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) False (b) True
7. 7.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
8. 8.🔍 Which is the odd one out? (a) time (b) a magnet (c) warm water (d) sugar
9. 9.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is kept the same. (a) False (b) True
10. 10.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) sugar (d) a comb
11. 11.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) a magnet (d) a balloon
12. 12.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is kept the same. (a) False (b) True
13. 13.True or false: salt is something yeast needs. (a) True (b) False
14. 14.True or false: warm water is something yeast does not need. (a) False (b) True
15. 15.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) keep it for a month (c) put it in your mouth (d) throw it at a wall
16. 16.🔍 Which is the odd one out? (a) a magnet (b) sunlight (c) time (d) salt
17. 17.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
18. 18.⚖️ 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 keep it the same (b) we measure it (c) we change it
19. 19.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) steam (c) carbon dioxide gas (d) smoke
20. 20.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a battery cell (c) warm water (d) dry yeast
21. 21.🍞 Which of these is something yeast needs? (a) sunlight (b) sugar (c) salt (d) a magnet
22. 22.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
23. 23.True or false: warm water is something yeast needs. (a) False (b) True
24. 24.⚖️ 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
25. 25.True or false: sugar is something yeast needs. (a) True (b) False
26. 26.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) the yeast is killed (c) it turns to sugar (d) it grows faster
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 the one thing we change. (a) True (b) False
28. 28.⚖️ 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 amount of sugar (c) the amount of yeast (d) the water temperature
29. 29.True or false: sugar is needed for the yeast balloon. (a) False (b) True
30. 30.True or false: sunlight is something yeast does not need. (a) True (b) False
31. 31.True or false: sugar is something yeast does not need. (a) True (b) False
32. 32.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
33. 33.True or false: warm water is needed for the yeast balloon. (a) False (b) True
34. 34.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is bigger (c) the balloon is smaller (d) it turns to bread
35. 35.True or false: salt is something yeast does not need. (a) True (b) False
36. 36.True or false: a comb is not needed for the yeast balloon. (a) False (b) True
37. 37.True or false: a small bottle is not needed for the yeast balloon. (a) False (b) True
38. 38.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a balloon (c) a battery cell (d) a paper clip
39. 39.⚖️ 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 change it (b) we keep it the same (c) we measure it
40. 40.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) time (d) sunlight

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