Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 223 · 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? True or false: the same bottles is kept the same. (a) False (b) True
2. 2.⚖️ 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 measure it (b) we keep it the same (c) we change it
3. 3.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
4. 4.🔮 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
5. 5.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
6. 6.🛟 The water for the yeast should be ___. (a) very salty (b) ice cold (c) warm, not hot (d) boiling hot
7. 7.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it glows (c) it turns to sugar (d) the yeast is killed
8. 8.⚖️ 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 change it (c) we keep it the same
9. 9.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) salt (d) time
10. 10.True or false: a magnet is something yeast does not need. (a) False (b) True
11. 11.True or false: sugar is something yeast does not need. (a) True (b) False
12. 12.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) dry yeast (c) warm water (d) a magnet
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 yeast”? (a) we measure it (b) we keep it the same (c) we change it
14. 14.True or false: a magnet is needed for the yeast balloon. (a) False (b) True
15. 15.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
16. 16.True or false: a small bottle is not needed for the yeast balloon. (a) False (b) True
17. 17.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
18. 18.🔍 Which is the odd one out? (a) salt (b) time (c) a magnet (d) vinegar
19. 19.⚖️ 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 keep it the same (c) we measure it
20. 20.True or false: salt is something yeast does not need. (a) False (b) True
21. 21.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) dry yeast (c) turmeric powder (d) a mirror
22. 22.⚖️ 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 sugar (c) size of the balloon
23. 23.⚖️ 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 keep it the same (b) we measure it (c) we change 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) size of the balloon (c) the amount of sugar (d) the amount of water
25. 25.🍞 Which of these is something yeast needs? (a) warm water (b) a magnet (c) salt (d) vinegar
26. 26.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is the one thing we change. (a) True (b) False
27. 27.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is the one thing we change. (a) True (b) False
28. 28.True or false: turmeric powder is not needed for the yeast balloon. (a) True (b) False
29. 29.📘 What is yeast? (a) a kind of stone (b) a tiny living fungus (c) a kind of sugar (d) a kind of salt
30. 30.🔍 Which is the odd one out? (a) vinegar (b) time (c) sugar (d) warm water
31. 31.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) sugar (c) dry yeast (d) a paper clip
32. 32.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it bursts at once (c) it turns yellow (d) it grows very little
33. 33.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to colour it (c) to make it sweet (d) to make it heavy
34. 34.⚖️ 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
35. 35.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
36. 36.True or false: a magnet is something yeast needs. (a) True (b) False
37. 37.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) smoke (c) air from outside (d) steam
38. 38.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
39. 39.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
40. 40.True or false: vinegar is something yeast needs. (a) False (b) True

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