Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 488 · 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.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) keep it for a month (c) throw it at a wall (d) pour it down the sink
2. 2.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to make bread rise (c) to wash dishes (d) to clean floors
3. 3.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) warm water (c) sugar (d) a mirror
4. 4.⚖️ 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
5. 5.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) steam (c) carbon dioxide gas (d) air from outside
6. 6.🛟 The water for the yeast should be ___. (a) warm, not hot (b) ice cold (c) boiling hot (d) very salty
7. 7.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
8. 8.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) warm water (c) a battery cell (d) a paper clip
9. 9.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it glows (c) the yeast is killed (d) it turns to sugar
10. 10.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) a battery cell (d) sugar
11. 11.📘 What is yeast? (a) a kind of sugar (b) a kind of stone (c) a kind of salt (d) a tiny living fungus
12. 12.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is what we measure. (a) False (b) True
13. 13.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
14. 14.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
15. 15.🔍 Which is the odd one out? (a) time (b) sugar (c) warm water (d) salt
16. 16.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
17. 17.True or false: warm water is something yeast does not need. (a) True (b) False
18. 18.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a small bottle (c) sugar (d) a magnet
19. 19.⚖️ 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
20. 20.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
21. 21.True or false: turmeric powder is not needed for the yeast balloon. (a) True (b) False
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 amount of sugar
23. 23.True or false: warm water is something yeast needs. (a) False (b) True
24. 24.⚖️ 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 keep it the same (c) we change it
25. 25.True or false: vinegar is something yeast needs. (a) True (b) False
26. 26.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
27. 27.🧺 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) warm water
28. 28.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it bursts at once (c) it turns yellow (d) it grows very little
29. 29.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
30. 30.🔍 Which is the odd one out? (a) a magnet (b) sunlight (c) time (d) salt
31. 31.🍞 Which of these is something yeast needs? (a) salt (b) sunlight (c) a magnet (d) sugar
32. 32.⚖️ 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 amount of sugar
33. 33.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
34. 34.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
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 yeast”? (a) we change it (b) we keep it the same (c) we measure it
36. 36.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a small bottle (c) a paper clip (d) a battery cell
37. 37.⚖️ 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 keep it the same (b) we measure it (c) we change it
38. 38.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) sugar (c) turmeric powder (d) warm water
39. 39.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) warm water (d) a magnet
40. 40.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a paper clip (c) sugar (d) a small bottle

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