Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 309 · 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? Which of these is kept the same? (a) size of the balloon (b) the amount of water (c) the water temperature
2. 2.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
3. 3.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
4. 4.⚖️ 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 sugar (c) the water temperature
5. 5.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a battery cell (c) a mirror (d) a small bottle
6. 6.🛟 The water for the yeast should be ___. (a) warm, not hot (b) boiling hot (c) ice cold (d) very salty
7. 7.⚖️ 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 change it (c) we keep it the same
8. 8.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) the yeast is killed (c) it turns to sugar (d) it glows
9. 9.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) air from outside (c) carbon dioxide gas (d) steam
10. 10.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) dry yeast (c) a small bottle (d) sugar
11. 11.⚖️ 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) size of the balloon (b) the amount of yeast (c) the water temperature (d) the amount of water
12. 12.🔍 Which is the odd one out? (a) a magnet (b) salt (c) sunlight (d) sugar
13. 13.🔍 Which is the odd one out? (a) a magnet (b) time (c) sunlight (d) vinegar
14. 14.🔍 Which is the odd one out? (a) warm water (b) sugar (c) time (d) sunlight
15. 15.True or false: warm water is something yeast does not need. (a) True (b) False
16. 16.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) throw it at a wall (c) pour it down the sink (d) put it in your mouth
17. 17.True or false: a magnet is not needed for the yeast balloon. (a) False (b) True
18. 18.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to clean floors (c) to colour rice (d) to wash dishes
19. 19.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
20. 20.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) size of the balloon (b) the same bottles (c) the amount of yeast (d) the amount of sugar
21. 21.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is the one thing we change. (a) True (b) False
22. 22.🧺 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) sugar
23. 23.📘 What is yeast? (a) a kind of sugar (b) a kind of stone (c) a kind of salt (d) a tiny living fungus
24. 24.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
25. 25.🍞 Which of these is something yeast needs? (a) sugar (b) a magnet (c) salt (d) sunlight
26. 26.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
27. 27.True or false: a magnet is something yeast needs. (a) True (b) False
28. 28.⚖️ 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 keep it the same (b) we change it (c) we measure it
29. 29.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
30. 30.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) sugar (c) a mirror (d) a balloon
31. 31.⚖️ 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 change it (c) we keep it the same
32. 32.True or false: vinegar is something yeast needs. (a) True (b) False
33. 33.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold slows yeast down (c) cold makes it pink (d) cold water is heavy
34. 34.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a battery cell (c) a paper clip (d) dry yeast
35. 35.True or false: a mirror is not needed for the yeast balloon. (a) True (b) False
36. 36.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a battery cell (c) warm water (d) a mirror
37. 37.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) warm water (c) a mirror (d) a balloon
38. 38.⚖️ 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
39. 39.True or false: a balloon is needed for the yeast balloon. (a) False (b) True
40. 40.🔍 Which is the odd one out? (a) vinegar (b) sugar (c) time (d) warm water

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