Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 203 · 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) it grows faster (b) it turns to sugar (c) the yeast is killed (d) it glows
2. 2.True or false: sugar is needed for the yeast balloon. (a) True (b) False
3. 3.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
4. 4.🔍 Which is the odd one out? (a) sugar (b) salt (c) sunlight (d) a magnet
5. 5.⚖️ 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 change it (c) we measure it
6. 6.🛟 The water for the yeast should be ___. (a) ice cold (b) warm, not hot (c) very salty (d) boiling hot
7. 7.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) carbon dioxide gas (c) air from outside (d) smoke
8. 8.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to wash dishes (c) to make bread rise (d) to colour rice
9. 9.True or false: a balloon is not needed for the yeast balloon. (a) False (b) True
10. 10.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) a mirror (c) a battery cell (d) a magnet
11. 11.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a battery cell (c) sugar (d) dry yeast
12. 12.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a magnet (c) dry yeast (d) turmeric powder
13. 13.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) pour it down the sink (c) keep it for a month (d) throw it at a wall
14. 14.True or false: sugar is something yeast needs. (a) False (b) True
15. 15.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
16. 16.True or false: salt is something yeast needs. (a) False (b) True
17. 17.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it bursts at once (c) it turns yellow (d) it grows very little
18. 18.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is what we measure. (a) False (b) True
19. 19.🔍 Which is the odd one out? (a) time (b) sugar (c) warm water (d) a magnet
20. 20.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold water is heavy (c) cold kills sugar (d) cold slows yeast down
21. 21.⚖️ 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) True (b) False
22. 22.True or false: warm water is something yeast needs. (a) False (b) True
23. 23.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
24. 24.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a paper clip (c) sugar (d) a small bottle
25. 25.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
26. 26.True or false: a comb is needed for the yeast balloon. (a) True (b) False
27. 27.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
28. 28.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
29. 29.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) a magnet (d) sugar
30. 30.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
31. 31.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) it turns to bread (c) the balloon is smaller (d) it shrinks to nothing
32. 32.⚖️ 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 measure it (b) we change it (c) we keep it the same
33. 33.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is the one thing we change. (a) False (b) True
34. 34.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) dry yeast (c) a mirror (d) a small bottle
35. 35.True or false: a small bottle is needed for the yeast balloon. (a) True (b) False
36. 36.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) a balloon (d) a magnet
37. 37.⚖️ 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 water temperature (d) the amount of yeast
38. 38.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
39. 39.True or false: sugar is something yeast does not need. (a) True (b) False
40. 40.True or false: turmeric powder 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