Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 549 · 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.🍞 Which of these is something yeast needs? (a) a magnet (b) sunlight (c) warm water (d) vinegar
2. 2.True or false: sugar is something yeast needs. (a) True (b) False
3. 3.🍞 Which of these is something yeast does not need? (a) salt (b) time (c) warm water (d) sugar
4. 4.🛟 The water for the yeast should be ___. (a) ice cold (b) boiling hot (c) warm, not hot (d) very salty
5. 5.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) dry yeast (c) a mirror (d) sugar
6. 6.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) a small bottle (c) warm water (d) sugar
7. 7.⚖️ 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 water temperature (c) the same bottles (d) size of the balloon
8. 8.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a mirror (c) a battery cell (d) sugar
9. 9.⚖️ 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) size of the balloon (c) the amount of sugar
10. 10.⚖️ 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 yeast (b) the amount of water (c) the amount of sugar (d) size of the balloon
11. 11.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it bursts at once (c) it turns yellow (d) it grows much faster
12. 12.True or false: a battery cell is needed for the yeast balloon. (a) True (b) False
13. 13.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) warm water (c) a paper clip (d) turmeric powder
14. 14.⚖️ 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
15. 15.True or false: time is something yeast does not need. (a) False (b) True
16. 16.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it turns to sugar (c) the yeast is killed (d) it glows
17. 17.🧺 Which of these is not needed for the yeast balloon? (a) a magnet (b) a balloon (c) a small bottle (d) dry yeast
18. 18.True or false: salt is something yeast does not need. (a) False (b) True
19. 19.📘 What is yeast? (a) a kind of stone (b) a tiny living fungus (c) a kind of salt (d) a kind of sugar
20. 20.⚖️ 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 keep it the same (b) we measure it (c) we change it
21. 21.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
22. 22.⚖️ 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
23. 23.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to make bread rise (c) to colour rice (d) to wash dishes
24. 24.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) the balloon is bigger (c) it shrinks to nothing (d) it turns to bread
25. 25.🍞 Which of these is something yeast needs? (a) vinegar (b) time (c) sunlight (d) salt
26. 26.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a magnet (c) a mirror (d) a small bottle
27. 27.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
28. 28.⚖️ 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 measure it (b) we change it (c) we keep it the same
29. 29.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) dry yeast (c) warm water (d) a paper clip
30. 30.🔍 Which is the odd one out? (a) salt (b) a magnet (c) vinegar (d) warm water
31. 31.True or false: sunlight is something yeast does not need. (a) True (b) False
32. 32.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) smoke (c) air from outside (d) steam
33. 33.True or false: turmeric powder is not needed for the yeast balloon. (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 amount of yeast”? (a) we keep it the same (b) we measure it (c) we change it
35. 35.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
36. 36.True or false: a mirror is needed for the yeast balloon. (a) True (b) False
37. 37.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) warm water (d) sunlight
38. 38.🔍 Which is the odd one out? (a) sugar (b) salt (c) time (d) warm water
39. 39.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) put it in your mouth (c) pour it down the sink (d) keep it for a month
40. 40.🍞 Which of these is something yeast needs? (a) vinegar (b) sugar (c) sunlight (d) salt

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