Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 315 · 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.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is the one thing we change. (a) True (b) False
2. 2.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is the one thing we change. (a) True (b) False
3. 3.⚖️ 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) the same bottles (c) size of the balloon (d) the amount of sugar
4. 4.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold makes it pink (c) cold kills sugar (d) cold slows yeast down
5. 5.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
6. 6.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it glows (c) it grows faster (d) the yeast is killed
7. 7.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
8. 8.🔮 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
9. 9.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to colour rice (c) to wash dishes (d) to make bread rise
10. 10.⚖️ 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 measure it (b) we keep it the same (c) we change it
11. 11.🔍 Which is the odd one out? (a) sugar (b) sunlight (c) warm water (d) time
12. 12.🔮 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
13. 13.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) smoke (c) carbon dioxide gas (d) air from outside
14. 14.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
15. 15.⚖️ 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) size of the balloon (d) the amount of water
16. 16.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a paper clip (c) a magnet (d) sugar
17. 17.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
18. 18.🍞 Which of these is something yeast does not need? (a) salt (b) warm water (c) time (d) sugar
19. 19.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a comb (c) a balloon (d) sugar
20. 20.⚖️ 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) False (b) True
21. 21.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) 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) True (b) False
23. 23.🍞 Which of these is something yeast needs? (a) a magnet (b) vinegar (c) time (d) sunlight
24. 24.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) pour it down the sink (c) throw it at a wall (d) put it in your mouth
25. 25.True or false: time is something yeast does not need. (a) True (b) False
26. 26.🍞 Does yeast need salt 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) sugar (b) a small bottle (c) dry yeast (d) a magnet
28. 28.True or false: dry yeast is needed for the yeast balloon. (a) False (b) True
29. 29.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
30. 30.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a mirror (c) dry yeast (d) a balloon
31. 31.True or false: salt is something yeast needs. (a) False (b) True
32. 32.🍞 Which of these is something yeast does not need? (a) warm water (b) vinegar (c) sugar (d) time
33. 33.⚖️ 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
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 measure it (b) we keep it the same (c) we change it
35. 35.True or false: vinegar is something yeast needs. (a) True (b) False
36. 36.📘 What is yeast? (a) a kind of salt (b) a kind of stone (c) a kind of sugar (d) a tiny living fungus
37. 37.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a paper clip (c) turmeric powder (d) a balloon
38. 38.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) turmeric powder (c) a comb (d) a small bottle
39. 39.🔍 Which is the odd one out? (a) sunlight (b) salt (c) sugar (d) a magnet
40. 40.🔍 Which is the odd one out? (a) time (b) salt (c) vinegar (d) sunlight

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