Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 191 · 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) pour it down the sink (b) throw it at a wall (c) put it in your mouth (d) keep it for a month
2. 2.🛟 The water for the yeast should be ___. (a) warm, not hot (b) very salty (c) boiling hot (d) ice cold
3. 3.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) turmeric powder (b) a balloon (c) sugar (d) warm water
4. 4.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows very little (c) it grows much faster (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) True (b) False
6. 6.True or false: a comb is not needed for the yeast balloon. (a) False (b) True
7. 7.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) a battery cell (d) a small bottle
8. 8.🔍 Which is the odd one out? (a) a magnet (b) time (c) vinegar (d) sunlight
9. 9.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) time (d) a magnet
10. 10.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
11. 11.True or false: warm water is something yeast does not need. (a) True (b) False
12. 12.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the same bottles (b) the amount of yeast (c) the amount of water (d) size of the balloon
13. 13.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold water is heavy (c) cold makes it pink (d) cold slows yeast down
14. 14.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
15. 15.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) it turns to bread (c) the balloon is smaller (d) the balloon is bigger
16. 16.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) warm water (c) sugar (d) a comb
17. 17.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) salt (d) sugar
18. 18.True or false: a balloon is needed for the yeast balloon. (a) False (b) True
19. 19.🍞 Which of these is something yeast needs? (a) sugar (b) salt (c) sunlight (d) vinegar
20. 20.True or false: sugar is something yeast does not need. (a) False (b) True
21. 21.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) a battery cell (c) a paper clip (d) a magnet
22. 22.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is the one thing we change. (a) True (b) False
23. 23.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) the yeast is killed (c) it turns to sugar (d) it grows faster
24. 24.⚖️ 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
25. 25.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to make bread rise (c) to colour rice (d) to clean floors
26. 26.🔍 Which is the odd one out? (a) a magnet (b) sunlight (c) vinegar (d) sugar
27. 27.⚖️ 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
28. 28.True or false: a magnet is something yeast does not need. (a) False (b) True
29. 29.📘 What is yeast? (a) a tiny living fungus (b) a kind of stone (c) a kind of sugar (d) a kind of salt
30. 30.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
31. 31.⚖️ 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
32. 32.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is what we measure. (a) True (b) False
33. 33.True or false: sunlight is something yeast needs. (a) True (b) False
34. 34.⚖️ 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
35. 35.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) steam (c) air from outside (d) carbon dioxide gas
36. 36.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
37. 37.⚖️ 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
38. 38.🔍 Which is the odd one out? (a) warm water (b) a magnet (c) vinegar (d) sunlight
39. 39.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) dry yeast (c) a balloon (d) a small bottle
40. 40.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the water temperature (b) the amount of water (c) size of the balloon

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