Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 835 · 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.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to make bread rise (c) to wash dishes (d) to colour rice
2. 2.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a balloon (c) a battery cell (d) a small bottle
3. 3.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
4. 4.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
5. 5.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
6. 6.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
7. 7.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is what we measure. (a) True (b) False
8. 8.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it grows faster (c) it turns to sugar (d) the yeast is killed
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.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
11. 11.🔍 Which is the odd one out? (a) sugar (b) salt (c) sunlight (d) vinegar
12. 12.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) dry yeast (c) warm water (d) a balloon
13. 13.True or false: sunlight is something yeast does not need. (a) True (b) False
14. 14.True or false: sugar is something yeast needs. (a) False (b) True
15. 15.True or false: a magnet is not needed for the yeast balloon. (a) False (b) True
16. 16.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
17. 17.⚖️ 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 change it (b) we measure it (c) we keep it the same
18. 18.⚖️ 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 measure it (b) we change it (c) we keep it the same
19. 19.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows very little (c) it bursts at once (d) it grows much faster
20. 20.📘 What is yeast? (a) a kind of salt (b) a tiny living fungus (c) a kind of sugar (d) a kind of stone
21. 21.🔍 Which is the odd one out? (a) time (b) vinegar (c) sunlight (d) salt
22. 22.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
23. 23.⚖️ 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 yeast (b) the water temperature (c) size of the balloon
24. 24.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) very salty (d) warm, not hot
25. 25.True or false: vinegar is something yeast does not need. (a) True (b) False
26. 26.🍞 Which of these is something yeast needs? (a) sunlight (b) a magnet (c) salt (d) time
27. 27.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
28. 28.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
29. 29.🍞 Which of these is something yeast needs? (a) warm water (b) a magnet (c) sunlight (d) vinegar
30. 30.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
31. 31.🍞 Which of these is something yeast needs? (a) sugar (b) salt (c) sunlight (d) a magnet
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 sugar”? (a) we measure it (b) we keep it the same (c) we change it
33. 33.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) carbon dioxide gas (c) smoke (d) air from outside
34. 34.🍞 Which of these is something yeast does not need? (a) salt (b) sugar (c) time (d) warm water
35. 35.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is bigger (c) the balloon is smaller (d) it turns to bread
36. 36.⚖️ 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 water (c) the amount of yeast (d) size of the balloon
37. 37.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) warm water (c) sugar (d) a small bottle
38. 38.⚖️ 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
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) False (b) True
40. 40.True or false: a mirror is not needed for the yeast balloon. (a) True (b) False

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