Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 487 · 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.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) smoke (c) steam (d) carbon dioxide gas
2. 2.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows much faster (c) it bursts at once (d) it grows very little
3. 3.True or false: vinegar is something yeast does not need. (a) True (b) False
4. 4.⚖️ 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
5. 5.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to colour rice (c) to clean floors (d) to make bread rise
6. 6.🔍 Which is the odd one out? (a) time (b) sugar (c) vinegar (d) warm water
7. 7.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
8. 8.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) it turns to bread (c) the balloon is smaller (d) the balloon is bigger
9. 9.True or false: warm water is something yeast does not need. (a) False (b) True
10. 10.⚖️ 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 measure it (b) we keep it the same (c) we change it
11. 11.🍞 Which of these is something yeast needs? (a) sunlight (b) time (c) vinegar (d) salt
12. 12.True or false: a comb is not needed for the yeast balloon. (a) True (b) False
13. 13.True or false: a mirror is not needed for the yeast balloon. (a) True (b) False
14. 14.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a battery cell (c) sugar (d) a mirror
15. 15.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) sugar (c) dry yeast (d) a comb
16. 16.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) salt (d) time
17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a mirror (c) a balloon (d) sugar
18. 18.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) sugar (d) a magnet
19. 19.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) a paper clip (d) sugar
20. 20.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is kept the same. (a) True (b) False
21. 21.⚖️ 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) size of the balloon (c) the water temperature
22. 22.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a magnet (c) dry yeast (d) a small bottle
23. 23.⚖️ 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
24. 24.🍞 Which of these is something yeast needs? (a) salt (b) sugar (c) a magnet (d) sunlight
25. 25.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a balloon (c) a battery cell (d) dry yeast
26. 26.True or false: a battery cell is not needed for the yeast balloon. (a) False (b) True
27. 27.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) throw it at a wall (c) pour it down the sink (d) put it in your mouth
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a comb (c) dry yeast (d) warm water
29. 29.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
30. 30.🧺 Which of these is needed for the yeast balloon? (a) a small bottle (b) a comb (c) a magnet (d) a mirror
31. 31.🔍 Which is the odd one out? (a) salt (b) a magnet (c) vinegar (d) sugar
32. 32.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
33. 33.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) warm water (c) turmeric powder (d) a balloon
34. 34.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is kept the same. (a) False (b) True
35. 35.🔍 Which is the odd one out? (a) time (b) a magnet (c) warm water (d) sugar
36. 36.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
37. 37.True or false: salt is something yeast needs. (a) True (b) False
38. 38.⚖️ 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
39. 39.⚖️ 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) True (b) False
40. 40.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it grows faster (c) the yeast is killed (d) it glows

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