Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 281 · 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 does yeast work slowly in cold water? (a) cold makes it pink (b) cold water is heavy (c) cold slows yeast down (d) cold kills sugar
2. 2.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
3. 3.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to make it heavy (c) to make it sweet (d) to colour it
4. 4.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the same bottles (b) size of the balloon (c) the amount of sugar (d) the water temperature
5. 5.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a small bottle (c) a magnet (d) dry yeast
6. 6.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
7. 7.🛟 The water for the yeast should be ___. (a) boiling hot (b) very salty (c) warm, not hot (d) ice cold
8. 8.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to colour rice (c) to make bread rise (d) to clean floors
9. 9.⚖️ 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
10. 10.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a balloon (c) sugar (d) a mirror
11. 11.🛟 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
12. 12.⚖️ 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 yeast (b) the water temperature (c) size of the balloon
13. 13.True or false: a magnet is something yeast does not need. (a) True (b) False
14. 14.True or false: a paper clip is not needed for the yeast balloon. (a) False (b) True
15. 15.⚖️ 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
16. 16.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it glows (c) it turns to sugar (d) it grows faster
17. 17.🔮 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
18. 18.True or false: warm water is something yeast does not need. (a) False (b) True
19. 19.⚖️ 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
20. 20.🍞 Which of these is something yeast does not need? (a) sunlight (b) time (c) warm water (d) sugar
21. 21.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a magnet (c) sugar (d) a comb
22. 22.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
23. 23.🍞 Which of these is something yeast needs? (a) salt (b) a magnet (c) sugar (d) sunlight
24. 24.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) a magnet (d) sugar
25. 25.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
26. 26.⚖️ 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) True (b) False
27. 27.True or false: a magnet is not needed for the yeast balloon. (a) True (b) False
28. 28.True or false: a comb is needed for the yeast balloon. (a) True (b) False
29. 29.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) warm water (c) dry yeast (d) a mirror
30. 30.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) carbon dioxide gas (c) smoke (d) air from outside
31. 31.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
32. 32.🔍 Which is the odd one out? (a) salt (b) time (c) warm water (d) sugar
33. 33.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
34. 34.True or false: vinegar is something yeast does not need. (a) True (b) False
35. 35.🔍 Which is the odd one out? (a) warm water (b) vinegar (c) time (d) sugar
36. 36.🍞 Which of these is something yeast needs? (a) a magnet (b) warm water (c) sunlight (d) salt
37. 37.⚖️ 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 change it (b) we keep it the same (c) we measure it
38. 38.True or false: a small bottle is not needed for the yeast balloon. (a) False (b) True
39. 39.⚖️ 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 change it (b) we keep it the same (c) we measure it
40. 40.🧺 Which of these is needed for the yeast balloon? (a) dry yeast (b) a battery cell (c) turmeric powder (d) a paper clip

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