Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 893 · 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? Which of these is the one thing we change? (a) the water temperature (b) the amount of sugar (c) size of the balloon (d) the amount of yeast
2. 2.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) air from outside (c) smoke (d) steam
3. 3.True or false: a magnet is something yeast does not need. (a) True (b) False
4. 4.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a comb (c) a mirror (d) a small bottle
5. 5.🔍 Which is the odd one out? (a) sunlight (b) a magnet (c) sugar (d) salt
6. 6.True or false: vinegar is something yeast does not need. (a) True (b) False
7. 7.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
8. 8.⚖️ 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
9. 9.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold slows yeast down (c) cold water is heavy (d) cold makes it pink
10. 10.🧺 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 battery cell
11. 11.🔍 Which is the odd one out? (a) warm water (b) salt (c) a magnet (d) sunlight
12. 12.🍞 Which of these is something yeast needs? (a) vinegar (b) a magnet (c) sugar (d) sunlight
13. 13.True or false: a paper clip is needed for the yeast balloon. (a) False (b) True
14. 14.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) keep it for a month (c) throw it at a wall (d) put it in your mouth
15. 15.True or false: turmeric powder is not needed for the yeast balloon. (a) True (b) False
16. 16.📘 What is yeast? (a) a kind of salt (b) a kind of sugar (c) a tiny living fungus (d) a kind of stone
17. 17.True or false: sunlight is something yeast needs. (a) True (b) False
18. 18.True or false: a paper clip is not needed for the yeast balloon. (a) True (b) False
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 keep it the same (b) we change it (c) we measure it
20. 20.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
21. 21.🔍 Which is the odd one out? (a) time (b) warm water (c) a magnet (d) sugar
22. 22.⚖️ 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
23. 23.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) size of the balloon (b) the amount of sugar (c) the same bottles (d) the water temperature
24. 24.🔮 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
25. 25.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
26. 26.🔍 Which is the odd one out? (a) time (b) sugar (c) salt (d) warm water
27. 27.True or false: a mirror is needed for the yeast balloon. (a) True (b) False
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a magnet (d) warm water
29. 29.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) warm water (c) a small bottle (d) turmeric powder
30. 30.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
31. 31.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
32. 32.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a small bottle (c) dry yeast (d) a comb
33. 33.⚖️ 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) True (b) False
34. 34.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows much faster (c) it grows very little (d) it bursts at once
35. 35.⚖️ 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 change it (c) we measure it
36. 36.True or false: sugar is something yeast does not need. (a) False (b) True
37. 37.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
38. 38.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) turmeric powder (c) sugar (d) a battery cell
39. 39.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a balloon (c) a mirror (d) dry yeast
40. 40.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it heavy (c) to make it sweet (d) it is food for yeast

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