Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 266 · 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.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
2. 2.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is what we measure. (a) True (b) False
3. 3.🔍 Which is the odd one out? (a) a magnet (b) sunlight (c) warm water (d) salt
4. 4.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
5. 5.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) dry yeast (c) warm water (d) a comb
6. 6.True or false: a mirror is needed for the yeast balloon. (a) False (b) True
7. 7.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) air from outside (c) carbon dioxide gas (d) steam
8. 8.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is what we measure. (a) False (b) True
9. 9.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) warm water (c) a balloon (d) a mirror
10. 10.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a paper clip (c) a magnet (d) sugar
11. 11.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
12. 12.🍞 Which of these is something yeast does not need? (a) salt (b) warm water (c) sugar (d) time
13. 13.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
14. 14.⚖️ 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
15. 15.⚖️ 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
16. 16.🔍 Which is the odd one out? (a) vinegar (b) sugar (c) sunlight (d) a magnet
17. 17.True or false: salt is something yeast does not need. (a) False (b) True
18. 18.⚖️ 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) False (b) True
19. 19.True or false: warm water is something yeast needs. (a) False (b) True
20. 20.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) warm water (c) dry yeast (d) a comb
21. 21.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it grows faster (c) it glows (d) it turns to sugar
22. 22.True or false: warm water is something yeast does not need. (a) True (b) False
23. 23.🔮 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
24. 24.⚖️ 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
25. 25.⚖️ 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
26. 26.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold makes it pink (c) cold water is heavy (d) cold kills sugar
27. 27.🍞 Which of these is something yeast does not need? (a) warm water (b) a magnet (c) sugar (d) time
28. 28.⚖️ 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 water (c) size of the balloon
29. 29.True or false: a small bottle is needed for the yeast balloon. (a) True (b) False
30. 30.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a mirror (c) a magnet (d) warm water
31. 31.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
32. 32.⚖️ 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 measure it (b) we keep it the same (c) we change it
33. 33.🔍 Which is the odd one out? (a) a magnet (b) salt (c) vinegar (d) time
34. 34.📘 What is yeast? (a) a kind of sugar (b) a kind of salt (c) a kind of stone (d) a tiny living fungus
35. 35.True or false: warm water is needed for the yeast balloon. (a) True (b) False
36. 36.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to colour rice (c) to wash dishes (d) to make bread rise
37. 37.🔍 Which is the odd one out? (a) time (b) sugar (c) salt (d) warm water
38. 38.⚖️ 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
39. 39.True or false: turmeric powder is not needed for the yeast balloon. (a) True (b) False
40. 40.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it

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