Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 695 · 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 not needed for the yeast balloon? (a) warm water (b) a magnet (c) sugar (d) dry yeast
2. 2.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a battery cell (c) dry yeast (d) a paper clip
3. 3.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
4. 4.🔍 Which is the odd one out? (a) time (b) sugar (c) warm water (d) sunlight
5. 5.True or false: sugar is something yeast does not need. (a) False (b) True
6. 6.True or false: a mirror is not needed for the yeast balloon. (a) True (b) False
7. 7.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold kills sugar (c) cold slows yeast down (d) cold water is heavy
8. 8.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows very little (c) it turns yellow (d) it grows much faster
9. 9.⚖️ 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
10. 10.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a balloon (c) a mirror (d) a small bottle
11. 11.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it turns to sugar (c) it glows (d) it grows faster
12. 12.⚖️ 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
13. 13.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) sugar (d) vinegar
14. 14.📘 What is yeast? (a) a kind of stone (b) a kind of sugar (c) a kind of salt (d) a tiny living fungus
15. 15.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a paper clip (c) sugar (d) a balloon
16. 16.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) sugar (c) a magnet (d) a mirror
17. 17.⚖️ 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 sugar (b) size of the balloon (c) the amount of yeast (d) the water temperature
18. 18.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a paper clip (c) a small bottle (d) a battery cell
19. 19.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
20. 20.🔍 Which is the odd one out? (a) sugar (b) time (c) warm water (d) vinegar
21. 21.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) keep it for a month (c) pour it down the sink (d) put it in your mouth
22. 22.⚖️ 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 water temperature
23. 23.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
24. 24.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
25. 25.🍞 Which of these is something yeast needs? (a) sunlight (b) a magnet (c) vinegar (d) sugar
26. 26.True or false: time is something yeast does not need. (a) True (b) False
27. 27.🔍 Which is the odd one out? (a) time (b) sugar (c) salt (d) warm water
28. 28.🔍 Which is the odd one out? (a) a magnet (b) sunlight (c) vinegar (d) sugar
29. 29.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
30. 30.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
31. 31.🛟 The water for the yeast should be ___. (a) warm, not hot (b) ice cold (c) boiling hot (d) very salty
32. 32.True or false: sugar is something yeast needs. (a) True (b) False
33. 33.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) smoke (c) steam (d) carbon dioxide gas
34. 34.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is the one thing we change. (a) True (b) False
35. 35.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to make bread rise (c) to wash dishes (d) to clean floors
36. 36.🔍 Which is the odd one out? (a) warm water (b) a magnet (c) sugar (d) time
37. 37.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
38. 38.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
39. 39.⚖️ 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 change it (b) we measure it (c) we keep it the same
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) size of the balloon (b) the amount of water (c) the water temperature

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