Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 657 · 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) keep it for a month (b) throw it at a wall (c) put it in your mouth (d) pour it down the sink
2. 2.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it glows (c) the yeast is killed (d) it grows faster
3. 3.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
4. 4.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
5. 5.⚖️ 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
6. 6.🔍 Which is the odd one out? (a) sunlight (b) sugar (c) vinegar (d) salt
7. 7.⚖️ 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
8. 8.⚖️ 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) False (b) True
9. 9.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a small bottle (d) a magnet
10. 10.🔍 Which is the odd one out? (a) vinegar (b) warm water (c) sugar (d) time
11. 11.⚖️ 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 change it (c) we keep it the same
12. 12.True or false: sugar is something yeast does not need. (a) True (b) False
13. 13.🍞 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
14. 14.⚖️ 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 same bottles (b) the amount of yeast (c) the amount of water (d) the water temperature
15. 15.🔍 Which is the odd one out? (a) vinegar (b) time (c) salt (d) sunlight
16. 16.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a mirror (c) dry yeast (d) warm water
17. 17.📘 What is yeast? (a) a kind of sugar (b) a kind of stone (c) a kind of salt (d) a tiny living fungus
18. 18.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it bursts at once (c) it grows very little (d) it grows much faster
19. 19.🔍 Which is the odd one out? (a) salt (b) warm water (c) a magnet (d) vinegar
20. 20.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) air from outside (c) smoke (d) steam
21. 21.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a magnet (c) a paper clip (d) warm water
22. 22.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
23. 23.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to make bread rise (c) to wash dishes (d) to colour rice
24. 24.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is kept the same. (a) True (b) False
25. 25.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
26. 26.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a comb (c) warm water (d) a small bottle
27. 27.True or false: vinegar is something yeast needs. (a) False (b) True
28. 28.🍞 Why do we add sugar to the yeast? (a) to colour it (b) it is food for yeast (c) to make it sweet (d) to make it heavy
29. 29.True or false: a comb is needed for the yeast balloon. (a) True (b) False
30. 30.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
31. 31.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
32. 32.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a balloon (c) turmeric powder (d) dry yeast
33. 33.⚖️ 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 change it (b) we keep it the same (c) we measure it
34. 34.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
35. 35.True or false: sugar is needed for the yeast balloon. (a) True (b) False
36. 36.⚖️ 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
37. 37.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) very salty (d) warm, not hot
38. 38.🧺 Which of these is not needed for the yeast balloon? (a) a magnet (b) a small bottle (c) dry yeast (d) a balloon
39. 39.True or false: time is something yeast needs. (a) False (b) True
40. 40.True or false: salt is something yeast does not need. (a) False (b) True

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