Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 719 · 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.True or false: a magnet is something yeast needs. (a) True (b) False
2. 2.⚖️ 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
3. 3.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
4. 4.True or false: sugar is needed for the yeast balloon. (a) True (b) False
5. 5.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
6. 6.True or false: sugar is something yeast needs. (a) False (b) True
7. 7.True or false: a mirror is needed for the yeast balloon. (a) True (b) False
8. 8.🔍 Which is the odd one out? (a) time (b) warm water (c) sugar (d) sunlight
9. 9.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) dry yeast (c) a comb (d) a magnet
10. 10.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
11. 11.⚖️ 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 change it (b) we keep it the same (c) we measure it
12. 12.⚖️ 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) the amount of water (d) size of the balloon
13. 13.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to make it heavy (c) to colour it (d) it is food for yeast
14. 14.⚖️ 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 amount of yeast
15. 15.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
16. 16.🔍 Which is the odd one out? (a) salt (b) a magnet (c) sunlight (d) sugar
17. 17.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a small bottle (c) warm water (d) a battery cell
18. 18.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) keep it for a month (c) put it in your mouth (d) pour it down the sink
19. 19.True or false: a magnet is something yeast does not need. (a) False (b) True
20. 20.⚖️ 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
21. 21.⚖️ 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 keep it the same (b) we change it (c) we measure it
22. 22.🔍 Which is the odd one out? (a) time (b) warm water (c) sugar (d) a magnet
23. 23.🍞 Which of these is something yeast needs? (a) a magnet (b) sugar (c) salt (d) vinegar
24. 24.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it turns yellow (c) it grows much faster (d) it bursts at once
25. 25.⚖️ 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) the amount of yeast (c) the amount of water (d) size of the balloon
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 change it (b) we keep it the same (c) we measure it
27. 27.📘 What is yeast? (a) a kind of salt (b) a kind of sugar (c) a tiny living fungus (d) a kind of stone
28. 28.True or false: dry yeast is needed for the yeast balloon. (a) False (b) True
29. 29.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) smoke (c) air from outside (d) carbon dioxide gas
30. 30.True or false: a paper clip is not needed for the yeast balloon. (a) True (b) False
31. 31.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
32. 32.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) dry yeast (c) warm water (d) a balloon
33. 33.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the amount of water (b) the water temperature (c) size of the balloon
34. 34.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) a small bottle (c) dry yeast (d) a balloon
35. 35.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) sunlight (d) warm water
36. 36.🔍 Which is the odd one out? (a) a magnet (b) vinegar (c) salt (d) warm water
37. 37.🍞 Which of these is something yeast needs? (a) a magnet (b) sunlight (c) vinegar (d) warm water
38. 38.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
39. 39.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
40. 40.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a magnet (c) a paper clip (d) warm water

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