Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 77 · 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.🔍 Which is the odd one out? (a) sugar (b) warm water (c) time (d) sunlight
2. 2.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
3. 3.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
4. 4.⚖️ 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) True (b) False
5. 5.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it glows (c) it grows faster (d) the yeast is killed
6. 6.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) dry yeast (c) a balloon (d) a comb
7. 7.⚖️ 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 keep it the same (b) we measure it (c) we change it
8. 8.True or false: warm water is needed for the yeast balloon. (a) False (b) True
9. 9.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
10. 10.⚖️ 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
11. 11.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) time (d) salt
12. 12.🍞 Which of these is something yeast needs? (a) a magnet (b) salt (c) sugar (d) sunlight
13. 13.⚖️ 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 keep it the same (b) we measure it (c) we change it
14. 14.🔍 Which is the odd one out? (a) a magnet (b) vinegar (c) salt (d) warm water
15. 15.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) steam (c) carbon dioxide gas (d) air from outside
16. 16.⚖️ 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
17. 17.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the amount of sugar (b) size of the balloon (c) the amount of yeast (d) the amount of water
18. 18.True or false: a mirror is needed for the yeast balloon. (a) False (b) True
19. 19.🛟 The water for the yeast should be ___. (a) very salty (b) warm, not hot (c) boiling hot (d) ice cold
20. 20.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
21. 21.⚖️ 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
22. 22.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a paper clip (c) a mirror (d) dry yeast
23. 23.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a mirror (c) a magnet (d) sugar
24. 24.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
25. 25.⚖️ 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
26. 26.⚖️ 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 change it (c) we measure it
27. 27.⚖️ 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
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a paper clip (c) dry yeast (d) sugar
29. 29.True or false: a balloon is needed for the yeast balloon. (a) False (b) True
30. 30.True or false: sunlight is something yeast needs. (a) True (b) False
31. 31.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows much faster (c) it grows very little (d) it turns yellow
32. 32.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) warm water (c) a comb (d) a magnet
33. 33.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold slows yeast down (c) cold water is heavy (d) cold kills sugar
34. 34.📘 What is yeast? (a) a kind of salt (b) a kind of sugar (c) a tiny living fungus (d) a kind of stone
35. 35.True or false: sugar is something yeast needs. (a) False (b) True
36. 36.🧺 Which of these is not needed for the yeast balloon? (a) a mirror (b) sugar (c) dry yeast (d) a balloon
37. 37.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to make it heavy (c) it is food for yeast (d) to colour it
38. 38.⚖️ 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) True (b) False
39. 39.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a mirror (c) a small bottle (d) dry yeast
40. 40.True or false: a paper clip is needed for the yeast balloon. (a) True (b) False

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