Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 674 · 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) the yeast is killed (b) it turns to sugar (c) it glows (d) it grows faster
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 yeast”? (a) we keep it the same (b) we change it (c) we measure it
3. 3.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a magnet (c) warm water (d) a small bottle
4. 4.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
5. 5.🛟 The water for the yeast should be ___. (a) very salty (b) ice cold (c) boiling hot (d) warm, not hot
6. 6.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a battery cell (b) sugar (c) warm water (d) a balloon
7. 7.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to make it heavy (c) to colour it (d) it is food for yeast
8. 8.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
9. 9.🍞 Which of these is something yeast needs? (a) a magnet (b) vinegar (c) sugar (d) sunlight
10. 10.True or false: sunlight is something yeast needs. (a) False (b) True
11. 11.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) sugar (c) a comb (d) a paper clip
12. 12.⚖️ 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) the water temperature (b) the same bottles (c) the amount of yeast (d) the amount of water
13. 13.🔍 Which is the odd one out? (a) time (b) warm water (c) salt (d) sugar
14. 14.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) throw it at a wall (c) keep it for a month (d) pour it down the sink
15. 15.⚖️ 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
16. 16.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
17. 17.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
18. 18.⚖️ 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 measure it (c) we keep it the same
19. 19.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
20. 20.⚖️ 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 change it (c) we measure it
21. 21.True or false: a comb is needed for the yeast balloon. (a) True (b) False
22. 22.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) sugar (c) turmeric powder (d) a balloon
23. 23.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it turns yellow (c) it grows very little (d) it bursts at once
24. 24.⚖️ 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) the amount of sugar (c) the same bottles (d) size of the balloon
25. 25.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) a mirror (d) a balloon
26. 26.⚖️ 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
27. 27.🔍 Which is the odd one out? (a) salt (b) vinegar (c) time (d) sunlight
28. 28.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is what we measure. (a) False (b) True
29. 29.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
30. 30.🔍 Which is the odd one out? (a) sugar (b) sunlight (c) vinegar (d) a magnet
31. 31.🔍 Which is the odd one out? (a) time (b) sugar (c) warm water (d) vinegar
32. 32.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to make bread rise (c) to clean floors (d) to wash dishes
33. 33.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) warm water (d) vinegar
34. 34.True or false: a balloon is needed for the yeast balloon. (a) True (b) False
35. 35.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is the one thing we change. (a) True (b) False
36. 36.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
37. 37.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold water is heavy (c) cold makes it pink (d) cold slows yeast down
38. 38.🧺 Which of these is not needed for the yeast balloon? (a) a paper clip (b) sugar (c) dry yeast (d) a balloon
39. 39.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
40. 40.True or false: a magnet is not needed for the yeast balloon. (a) False (b) True

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