Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 192 · 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.🛟 The water for the yeast should be ___. (a) warm, not hot (b) ice cold (c) boiling hot (d) very salty
2. 2.🔍 Which is the odd one out? (a) warm water (b) vinegar (c) salt (d) sunlight
3. 3.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) a balloon (c) a small bottle (d) dry yeast
4. 4.🍞 Which of these is something yeast needs? (a) a magnet (b) sugar (c) vinegar (d) salt
5. 5.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it bursts at once (c) it grows much faster (d) it grows very little
6. 6.True or false: sugar is something yeast needs. (a) False (b) True
7. 7.⚖️ 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
8. 8.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) dry yeast (c) a comb (d) a balloon
9. 9.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
10. 10.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
11. 11.🔍 Which is the odd one out? (a) time (b) warm water (c) sugar (d) vinegar
12. 12.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold water is heavy (c) cold slows yeast down (d) cold kills sugar
13. 13.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) smoke (c) air from outside (d) carbon dioxide gas
14. 14.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to wash dishes (c) to colour rice (d) to make bread rise
15. 15.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) dry yeast (c) a balloon (d) a mirror
16. 16.⚖️ 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 measure it (b) we keep it the same (c) we change it
17. 17.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is what we measure. (a) True (b) False
18. 18.True or false: vinegar is something yeast does not need. (a) False (b) True
19. 19.🧺 Which of these is needed for the yeast balloon? (a) a small bottle (b) a paper clip (c) a battery cell (d) a comb
20. 20.⚖️ 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 yeast (b) the water temperature (c) the amount of water (d) the amount of sugar
21. 21.🧺 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) sugar
22. 22.True or false: a mirror is not needed for the yeast balloon. (a) True (b) False
23. 23.True or false: a battery cell is not needed for the yeast balloon. (a) False (b) True
24. 24.🍞 Which of these is something yeast needs? (a) a magnet (b) sunlight (c) time (d) vinegar
25. 25.⚖️ 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
26. 26.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
27. 27.True or false: dry yeast is needed for the yeast balloon. (a) False (b) True
28. 28.⚖️ 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
29. 29.🔍 Which is the odd one out? (a) warm water (b) sugar (c) salt (d) time
30. 30.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
31. 31.🔍 Which is the odd one out? (a) time (b) sugar (c) warm water (d) sunlight
32. 32.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
33. 33.True or false: vinegar is something yeast needs. (a) True (b) False
34. 34.True or false: warm water is something yeast does not need. (a) True (b) False
35. 35.⚖️ 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 water (c) the water temperature
36. 36.⚖️ 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
37. 37.⚖️ 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 keep it the same (b) we measure it (c) we change it
38. 38.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
39. 39.True or false: turmeric powder is needed for the yeast balloon. (a) True (b) False
40. 40.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is the one thing we change. (a) True (b) False

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