Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 811 · 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.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
2. 2.🔍 Which is the odd one out? (a) vinegar (b) sunlight (c) salt (d) warm water
3. 3.🍞 Which of these is something yeast needs? (a) a magnet (b) vinegar (c) warm water (d) salt
4. 4.🍞 Which of these is something yeast needs? (a) a magnet (b) vinegar (c) salt (d) sugar
5. 5.📘 What is yeast? (a) a kind of salt (b) a kind of sugar (c) a kind of stone (d) a tiny living fungus
6. 6.🛟 The water for the yeast should be ___. (a) very salty (b) warm, not hot (c) ice cold (d) boiling hot
7. 7.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it grows very little (c) it bursts at once (d) it turns yellow
8. 8.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) dry yeast (c) a balloon (d) a small bottle
9. 9.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a magnet (c) sugar (d) a small bottle
10. 10.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
11. 11.⚖️ 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) False (b) True
12. 12.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
13. 13.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
14. 14.True or false: vinegar is something yeast does not need. (a) False (b) True
15. 15.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) air from outside (c) steam (d) carbon dioxide gas
16. 16.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to wash dishes (c) to make bread rise (d) to colour rice
17. 17.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold kills sugar (c) cold water is heavy (d) cold slows yeast down
18. 18.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) warm water (c) a small bottle (d) a paper clip
19. 19.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it grows faster (c) it turns to sugar (d) it glows
20. 20.⚖️ 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
21. 21.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) throw it at a wall (c) keep it for a month (d) put it in your mouth
22. 22.🔍 Which is the odd one out? (a) salt (b) sugar (c) time (d) warm water
23. 23.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to make it sweet (c) to colour it (d) it is food for yeast
24. 24.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) turmeric powder (c) a small bottle (d) a mirror
25. 25.True or false: a battery cell is not needed for the yeast balloon. (a) True (b) False
26. 26.🍞 Which of these is something yeast needs? (a) vinegar (b) salt (c) a magnet (d) time
27. 27.⚖️ 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 sugar (b) size of the balloon (c) the water temperature
28. 28.True or false: warm water is something yeast needs. (a) False (b) True
29. 29.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) time (d) sunlight
30. 30.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
31. 31.True or false: a paper clip is not needed for the yeast balloon. (a) False (b) True
32. 32.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) it turns to bread (c) it shrinks to nothing (d) the balloon is bigger
33. 33.⚖️ 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
34. 34.⚖️ 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
35. 35.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
36. 36.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a mirror (c) warm water (d) a battery cell
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 water (c) the water temperature (d) the amount of yeast
38. 38.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
39. 39.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) size of the balloon (b) the amount of yeast (c) the amount of sugar (d) the water temperature
40. 40.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed

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