Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 741 · 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.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) sugar (c) dry yeast (d) a magnet
2. 2.🔍 Which is the odd one out? (a) sugar (b) salt (c) warm water (d) time
3. 3.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) pour it down the sink (c) keep it for a month (d) put it in your mouth
4. 4.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
5. 5.⚖️ 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 change it (b) we measure it (c) we keep it the same
6. 6.🔍 Which is the odd one out? (a) sugar (b) warm water (c) time (d) vinegar
7. 7.True or false: sugar is something yeast needs. (a) True (b) False
8. 8.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
9. 9.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) warm water (c) dry yeast (d) a paper clip
10. 10.⚖️ 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) False (b) True
11. 11.True or false: sugar is needed for the yeast balloon. (a) False (b) True
12. 12.⚖️ 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 same bottles (d) the water temperature
13. 13.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of water”? (a) we change it (b) we keep it the same (c) we measure it
14. 14.True or false: sunlight is something yeast needs. (a) True (b) False
15. 15.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) air from outside (c) carbon dioxide gas (d) steam
16. 16.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) the balloon is bigger (c) it turns to bread (d) it shrinks to nothing
17. 17.🛟 The water for the yeast should be ___. (a) warm, not hot (b) ice cold (c) very salty (d) boiling hot
18. 18.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to colour rice (c) to wash dishes (d) to clean floors
19. 19.⚖️ 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) True (b) False
20. 20.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
21. 21.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
22. 22.📘 What is yeast? (a) a kind of salt (b) a kind of sugar (c) a tiny living fungus (d) a kind of stone
23. 23.⚖️ 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
24. 24.True or false: warm water is needed for the yeast balloon. (a) True (b) False
25. 25.True or false: sunlight is something yeast does not need. (a) True (b) False
26. 26.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
27. 27.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) it is food for yeast (c) to make it sweet (d) to colour it
28. 28.🔍 Which is the odd one out? (a) sunlight (b) sugar (c) salt (d) a magnet
29. 29.True or false: salt is something yeast needs. (a) True (b) False
30. 30.🍞 Which of these is something yeast needs? (a) sunlight (b) vinegar (c) sugar (d) a magnet
31. 31.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows much faster (c) it grows very little (d) it bursts at once
32. 32.True or false: a small bottle is not needed for the yeast balloon. (a) False (b) True
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 yeast”? (a) we keep it the same (b) we change it (c) we measure it
34. 34.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) warm water (c) a paper clip (d) turmeric powder
35. 35.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
36. 36.⚖️ 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 amount of sugar (c) the water temperature
37. 37.True or false: warm water is something yeast does not need. (a) True (b) False
38. 38.⚖️ 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 water temperature (b) the amount of yeast (c) the same bottles (d) the amount of sugar
39. 39.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) a small bottle (c) sugar (d) dry yeast
40. 40.⚖️ 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 measure it (c) we change it

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