Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 717 · 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? Which of these is what we measure? (a) the amount of sugar (b) the amount of water (c) size of the balloon (d) the water temperature
2. 2.True or false: sugar is something yeast does not need. (a) True (b) False
3. 3.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
4. 4.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) keep it for a month (c) throw it at a wall (d) put it in your mouth
5. 5.True or false: a mirror is needed for the yeast balloon. (a) True (b) False
6. 6.True or false: warm water is something yeast does not need. (a) True (b) False
7. 7.🍞 Which of these is something yeast needs? (a) vinegar (b) warm water (c) sunlight (d) salt
8. 8.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
9. 9.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
10. 10.True or false: a paper clip is needed for the yeast balloon. (a) False (b) True
11. 11.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to colour rice (c) to clean floors (d) to make bread rise
12. 12.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) very salty (d) warm, not hot
13. 13.⚖️ 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) False (b) True
14. 14.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a battery cell (c) a small bottle (d) sugar
15. 15.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a balloon (c) dry yeast (d) a paper clip
16. 16.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a balloon (d) a magnet
18. 18.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold makes it pink (c) cold water is heavy (d) cold slows yeast down
19. 19.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) it is food for yeast (c) to colour it (d) to make it sweet
20. 20.🔮 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
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) size of the balloon (b) the water temperature (c) the amount of water
22. 22.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) steam (c) smoke (d) carbon dioxide gas
23. 23.🔍 Which is the odd one out? (a) a magnet (b) warm water (c) sugar (d) time
24. 24.True or false: salt is something yeast does not need. (a) True (b) False
25. 25.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows much faster (c) it grows very little (d) it turns yellow
26. 26.🔍 Which is the odd one out? (a) salt (b) sugar (c) time (d) warm water
27. 27.⚖️ 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) False (b) True
28. 28.🧺 Which of these is needed for the yeast balloon? (a) sugar (b) a mirror (c) a comb (d) turmeric powder
29. 29.True or false: vinegar is something yeast does not need. (a) False (b) True
30. 30.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
31. 31.🍞 Which of these is something yeast does not need? (a) salt (b) warm water (c) time (d) sugar
32. 32.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
33. 33.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
34. 34.🔍 Which is the odd one out? (a) time (b) sugar (c) sunlight (d) warm water
35. 35.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of yeast”? (a) we change it (b) we keep it the same (c) we measure it
36. 36.⚖️ 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 same bottles (b) the amount of yeast (c) the water temperature (d) the amount of water
37. 37.⚖️ 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
38. 38.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) warm water (c) a balloon (d) a battery cell
39. 39.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
40. 40.🍞 Which of these is something yeast does not need? (a) sunlight (b) sugar (c) time (d) warm water

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