Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 516 · 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.True or false: a small bottle is not needed for the yeast balloon. (a) False (b) True
2. 2.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
3. 3.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) the yeast is killed (c) it turns to sugar (d) it grows faster
4. 4.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is the one thing we change. (a) False (b) True
5. 5.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
6. 6.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is the one thing we change. (a) True (b) False
7. 7.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
8. 8.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) air from outside (c) carbon dioxide gas (d) smoke
9. 9.True or false: sugar is needed for the yeast balloon. (a) False (b) True
10. 10.⚖️ 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
11. 11.⚖️ 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 measure it (c) we keep it the same
12. 12.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) keep it for a month (c) put it in your mouth (d) pour it down the sink
13. 13.🔮 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
14. 14.🔍 Which is the odd one out? (a) warm water (b) time (c) sugar (d) vinegar
15. 15.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) dry yeast (c) a magnet (d) a paper clip
16. 16.⚖️ 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
17. 17.True or false: a battery cell is not needed for the yeast balloon. (a) True (b) False
18. 18.⚖️ 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
19. 19.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
20. 20.🍞 Which of these is something yeast needs? (a) a magnet (b) salt (c) sunlight (d) warm water
21. 21.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is what we measure. (a) False (b) True
22. 22.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) a magnet (d) a small bottle
23. 23.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to make it sweet (c) it is food for yeast (d) to colour it
24. 24.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the same bottles (b) the amount of sugar (c) size of the balloon (d) the water temperature
25. 25.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a small bottle (c) sugar (d) a mirror
26. 26.True or false: time is something yeast does not need. (a) True (b) False
27. 27.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
28. 28.True or false: a battery cell is needed for the yeast balloon. (a) True (b) False
29. 29.🔍 Which is the odd one out? (a) warm water (b) sunlight (c) salt (d) a magnet
30. 30.📘 What is yeast? (a) a tiny living fungus (b) a kind of stone (c) a kind of salt (d) a kind of sugar
31. 31.True or false: sunlight is something yeast needs. (a) False (b) True
32. 32.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) sugar (d) a battery cell
33. 33.🍞 Which of these is something yeast needs? (a) a magnet (b) sugar (c) vinegar (d) salt
34. 34.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it turns yellow (c) it grows very little (d) it grows much faster
35. 35.🔍 Which is the odd one out? (a) time (b) warm water (c) sugar (d) salt
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) the water temperature (b) size of the balloon (c) the same bottles
37. 37.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
38. 38.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to colour rice (c) to make bread rise (d) to wash dishes
39. 39.⚖️ 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 change it (b) we measure it (c) we keep it the same
40. 40.⚖️ 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

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