Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 59 · 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.📘 What is yeast? (a) a kind of salt (b) a tiny living fungus (c) a kind of sugar (d) a kind of stone
2. 2.🔍 Which is the odd one out? (a) vinegar (b) warm water (c) time (d) sugar
3. 3.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
4. 4.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
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: the amount of yeast is the one thing we change. (a) True (b) False
7. 7.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a small bottle (c) dry yeast (d) a mirror
8. 8.True or false: a comb is not needed for the yeast balloon. (a) False (b) True
9. 9.⚖️ 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 water (b) size of the balloon (c) the amount of yeast (d) the water temperature
10. 10.⚖️ 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 change it (c) we measure it
11. 11.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) dry yeast (c) a magnet (d) sugar
12. 12.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
13. 13.⚖️ 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) size of the balloon (c) the amount of yeast (d) the amount of water
14. 14.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is bigger (c) it turns to bread (d) the balloon is smaller
15. 15.🛟 The water for the yeast should be ___. (a) boiling hot (b) very salty (c) ice cold (d) warm, not hot
16. 16.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
17. 17.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
18. 18.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
19. 19.🍞 Which of these is something yeast needs? (a) sunlight (b) salt (c) vinegar (d) warm water
20. 20.⚖️ 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) False (b) True
21. 21.True or false: a balloon is needed for the yeast balloon. (a) False (b) True
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) size of the balloon (b) the water temperature (c) the same bottles
23. 23.🔍 Which is the odd one out? (a) sugar (b) sunlight (c) a magnet (d) vinegar
24. 24.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
25. 25.🔍 Which is the odd one out? (a) time (b) sugar (c) a magnet (d) warm water
26. 26.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) size of the balloon (b) the amount of yeast (c) the water temperature
27. 27.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) steam (c) carbon dioxide gas (d) smoke
28. 28.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
29. 29.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) sunlight (d) time
30. 30.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a magnet (c) dry yeast (d) a battery cell
31. 31.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold slows yeast down (c) cold makes it pink (d) cold kills sugar
32. 32.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it sweet (c) to make it heavy (d) it is food for yeast
33. 33.🔍 Which is the odd one out? (a) salt (b) vinegar (c) sunlight (d) time
34. 34.⚖️ 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 change it (c) we keep it the same
35. 35.True or false: a small bottle is not needed for the yeast balloon. (a) False (b) True
36. 36.🔍 Which is the odd one out? (a) salt (b) a magnet (c) warm water (d) sunlight
37. 37.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is kept the same. (a) True (b) False
38. 38.🧺 Which of these is not needed for the yeast balloon? (a) a paper clip (b) sugar (c) a balloon (d) dry yeast
39. 39.🧺 Which of these is needed for the yeast balloon? (a) sugar (b) turmeric powder (c) a magnet (d) a paper clip
40. 40.🔮 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

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