Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 96 · 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.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a paper clip (c) warm water (d) a small bottle
2. 2.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
3. 3.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
4. 4.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it grows very little (c) it bursts at once (d) it turns yellow
5. 5.⚖️ 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
6. 6.🍞 Which of these is something yeast needs? (a) salt (b) sunlight (c) vinegar (d) sugar
7. 7.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) dry yeast (c) a battery cell (d) a magnet
8. 8.🧺 Which of these is not needed for the yeast balloon? (a) a battery cell (b) a balloon (c) warm water (d) dry yeast
9. 9.🔍 Which is the odd one out? (a) salt (b) vinegar (c) time (d) sunlight
10. 10.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
11. 11.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
12. 12.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) sugar (d) salt
13. 13.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
14. 14.⚖️ 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 change it (b) we measure it (c) we keep it the same
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 keep it the same (c) we change it
16. 16.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is kept the same. (a) True (b) False
17. 17.🔍 Which is the odd one out? (a) warm water (b) sunlight (c) time (d) sugar
18. 18.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a magnet (c) a comb (d) a balloon
19. 19.⚖️ 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 amount of water (b) the same bottles (c) the water temperature (d) the amount of sugar
20. 20.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
21. 21.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
22. 22.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to make bread rise (c) to clean floors (d) to colour rice
23. 23.📘 What is yeast? (a) a kind of stone (b) a tiny living fungus (c) a kind of sugar (d) a kind of salt
24. 24.🍞 Which of these is something yeast does not need? (a) a magnet (b) warm water (c) time (d) sugar
25. 25.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) warm water (c) sugar (d) a mirror
26. 26.⚖️ 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) False (b) True
27. 27.⚖️ 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) True (b) False
28. 28.True or false: sugar is something yeast does not need. (a) True (b) False
29. 29.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) carbon dioxide gas (c) smoke (d) steam
30. 30.True or false: a balloon is not needed for the yeast balloon. (a) False (b) True
31. 31.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of water”? (a) we measure it (b) we change it (c) we keep it the same
32. 32.⚖️ 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 change it (b) we measure it (c) we keep it the same
33. 33.True or false: a small bottle is needed for the yeast balloon. (a) True (b) False
34. 34.🍞 Which of these is something yeast needs? (a) salt (b) vinegar (c) a magnet (d) warm water
35. 35.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
36. 36.True or false: salt is something yeast needs. (a) False (b) True
37. 37.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) warm water (c) a comb (d) a small bottle
38. 38.🧺 Which of these is not needed for the yeast balloon? (a) a paper clip (b) a small bottle (c) sugar (d) dry yeast
39. 39.⚖️ 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
40. 40.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) keep it for a month (c) pour it down the sink (d) put it in your mouth

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