Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 820 · 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.⚖️ 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
2. 2.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a magnet (c) a balloon (d) a small bottle
3. 3.🍞 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
4. 4.🛟 The water for the yeast should be ___. (a) boiling hot (b) warm, not hot (c) ice cold (d) very salty
5. 5.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) warm water (c) dry yeast (d) a paper clip
6. 6.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) size of the balloon (b) the water temperature (c) the amount of water
7. 7.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is kept the same. (a) False (b) True
8. 8.⚖️ 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
9. 9.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
10. 10.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
11. 11.True or false: a magnet is something yeast needs. (a) True (b) False
12. 12.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to colour it (c) it is food for yeast (d) to make it heavy
13. 13.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) put it in your mouth (c) pour it down the sink (d) keep it for a month
14. 14.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) time (d) vinegar
15. 15.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
16. 16.🍞 Which of these is something yeast needs? (a) time (b) sunlight (c) vinegar (d) a magnet
17. 17.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a mirror (c) a battery cell (d) warm water
18. 18.⚖️ 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 amount of sugar (b) the amount of water (c) the water temperature (d) the amount of yeast
19. 19.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) air from outside (c) carbon dioxide gas (d) smoke
20. 20.⚖️ 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
21. 21.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it glows (c) the yeast is killed (d) it turns to sugar
22. 22.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) turmeric powder (b) sugar (c) a balloon (d) dry yeast
23. 23.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a small bottle (c) a comb (d) a balloon
24. 24.True or false: dry yeast is needed for the yeast balloon. (a) False (b) True
25. 25.🍞 Which of these is something yeast needs? (a) warm water (b) a magnet (c) vinegar (d) salt
26. 26.⚖️ 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
27. 27.⚖️ 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) False (b) True
28. 28.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it bursts at once (c) it grows much faster (d) it grows very little
29. 29.True or false: a battery cell is not needed for the yeast balloon. (a) False (b) True
30. 30.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
31. 31.True or false: a balloon is needed for the yeast balloon. (a) False (b) True
32. 32.🔍 Which is the odd one out? (a) time (b) vinegar (c) a magnet (d) salt
33. 33.🍞 Which of these is something yeast does not need? (a) time (b) sunlight (c) sugar (d) warm water
34. 34.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the same bottles (b) the water temperature (c) size of the balloon
35. 35.True or false: turmeric powder is needed for the yeast balloon. (a) True (b) False
36. 36.⚖️ 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) True (b) False
37. 37.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) size of the balloon (b) the water temperature (c) the amount of sugar
38. 38.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a battery cell (c) sugar (d) warm water
39. 39.True or false: a comb is not needed for the yeast balloon. (a) False (b) True
40. 40.🍞 Which of these is something yeast does not need? (a) salt (b) sugar (c) time (d) warm water

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