Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 749 · 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? What do we do with “the amount of sugar”? (a) we change it (b) we keep it the same (c) we measure it
2. 2.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) turmeric powder (c) a balloon (d) a magnet
3. 3.⚖️ 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
4. 4.True or false: time is something yeast does not need. (a) True (b) False
5. 5.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
6. 6.⚖️ 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
7. 7.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) a mirror (c) a magnet (d) turmeric powder
8. 8.True or false: salt is something yeast does not need. (a) True (b) False
9. 9.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
10. 10.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
11. 11.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
12. 12.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
13. 13.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
14. 14.True or false: a comb is needed for the yeast balloon. (a) True (b) False
15. 15.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to colour it (c) to make it heavy (d) it is food for yeast
16. 16.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is what we measure. (a) False (b) True
17. 17.⚖️ 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) True (b) False
18. 18.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) carbon dioxide gas (c) steam (d) smoke
19. 19.🍞 Which of these is something yeast does not need? (a) sugar (b) salt (c) time (d) warm water
20. 20.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) warm water (c) a comb (d) sugar
21. 21.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
22. 22.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) the balloon is bigger (c) it shrinks to nothing (d) it turns to bread
23. 23.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it glows (c) it grows faster (d) it turns to sugar
24. 24.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) dry yeast (c) a magnet (d) a mirror
25. 25.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
26. 26.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
27. 27.True or false: vinegar is something yeast does not need. (a) False (b) True
28. 28.🍞 Which of these is something yeast does not need? (a) sunlight (b) warm water (c) time (d) sugar
29. 29.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) sugar (c) dry yeast (d) a mirror
30. 30.True or false: a magnet is something yeast does not need. (a) False (b) True
31. 31.🍞 Which of these is something yeast needs? (a) sugar (b) vinegar (c) sunlight (d) a magnet
32. 32.True or false: warm water is something yeast does not need. (a) False (b) True
33. 33.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) keep it for a month (c) pour it down the sink (d) throw it at a wall
34. 34.⚖️ 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 sugar (c) the amount of water (d) the same bottles
35. 35.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is what we measure. (a) True (b) False
36. 36.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it turns yellow (c) it grows much faster (d) it bursts at once
37. 37.🔍 Which is the odd one out? (a) warm water (b) time (c) sugar (d) a magnet
38. 38.🔍 Which is the odd one out? (a) sugar (b) a magnet (c) sunlight (d) salt
39. 39.📘 What is yeast? (a) a kind of sugar (b) a kind of salt (c) a kind of stone (d) a tiny living fungus
40. 40.🍞 Which of these is something yeast needs? (a) vinegar (b) sunlight (c) time (d) a magnet

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