Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 282 · 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 the one thing we change? (a) the amount of yeast (b) the amount of water (c) the amount of sugar (d) the water temperature
2. 2.🍞 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
3. 3.⚖️ 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 water (b) the same bottles (c) size of the balloon (d) the amount of sugar
4. 4.⚖️ 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 change it (c) we keep it the same
5. 5.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
6. 6.🔍 Which is the odd one out? (a) vinegar (b) salt (c) sunlight (d) warm water
7. 7.⚖️ 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) True (b) False
8. 8.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
9. 9.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) sugar (c) a small bottle (d) a mirror
10. 10.🍞 Which of these is something yeast needs? (a) sunlight (b) vinegar (c) warm water (d) salt
11. 11.⚖️ 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 measure it (b) we keep it the same (c) we change it
12. 12.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
13. 13.🛟 The water for the yeast should be ___. (a) boiling hot (b) very salty (c) ice cold (d) warm, not hot
14. 14.🧺 Which of these is needed for the yeast balloon? (a) dry yeast (b) a paper clip (c) a comb (d) a magnet
15. 15.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) warm water (d) a magnet
16. 16.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
17. 17.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to wash dishes (c) to colour rice (d) to clean floors
18. 18.🔍 Which is the odd one out? (a) sugar (b) time (c) warm water (d) salt
19. 19.🍞 Which of these is something yeast does not need? (a) time (b) salt (c) warm water (d) sugar
20. 20.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
21. 21.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) put it in your mouth (c) keep it for a month (d) throw it at a wall
22. 22.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold kills sugar (c) cold slows yeast down (d) cold makes it pink
23. 23.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
24. 24.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
25. 25.⚖️ 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 measure it (b) we keep it the same (c) we change it
26. 26.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the water temperature (b) the amount of yeast (c) size of the balloon
27. 27.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a battery cell (c) a balloon (d) dry yeast
28. 28.🍞 Which of these is something yeast needs? (a) sunlight (b) salt (c) time (d) a magnet
29. 29.True or false: salt is something yeast needs. (a) False (b) True
30. 30.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
31. 31.True or false: vinegar is something yeast needs. (a) True (b) False
32. 32.True or false: sugar is something yeast needs. (a) True (b) False
33. 33.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
34. 34.⚖️ 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
35. 35.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a balloon (c) a magnet (d) a battery cell
36. 36.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows very little (c) it grows much faster (d) it turns yellow
37. 37.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) time (d) a magnet
38. 38.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the water temperature (b) size of the balloon (c) the amount of sugar
39. 39.True or false: a mirror is not needed for the yeast balloon. (a) True (b) False
40. 40.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) air from outside (c) smoke (d) steam

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