Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 236 · 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 what we measure. (a) False (b) True
2. 2.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
3. 3.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
4. 4.🛟 The water for the yeast should be ___. (a) ice cold (b) boiling hot (c) very salty (d) warm, not hot
5. 5.True or false: a mirror is needed for the yeast balloon. (a) True (b) False
6. 6.🔍 Which is the odd one out? (a) warm water (b) sugar (c) vinegar (d) time
7. 7.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to wash dishes (c) to make bread rise (d) to clean floors
8. 8.🔍 Which is the odd one out? (a) warm water (b) sunlight (c) sugar (d) time
9. 9.🍞 Which of these is something yeast needs? (a) salt (b) a magnet (c) sunlight (d) time
10. 10.🔍 Which is the odd one out? (a) sunlight (b) warm water (c) a magnet (d) vinegar
11. 11.⚖️ 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
12. 12.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) pour it down the sink (c) throw it at a wall (d) keep it for a month
13. 13.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
14. 14.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the amount of water (b) the water temperature (c) size of the balloon
15. 15.📘 What is yeast? (a) a kind of sugar (b) a kind of stone (c) a kind of salt (d) a tiny living fungus
16. 16.🧺 Which of these is not needed for the yeast balloon? (a) a comb (b) a balloon (c) sugar (d) dry yeast
17. 17.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
18. 18.True or false: vinegar is something yeast does not need. (a) False (b) True
19. 19.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) warm water (c) dry yeast (d) a mirror
20. 20.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) warm water (c) a balloon (d) turmeric powder
21. 21.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
22. 22.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
23. 23.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it grows much faster (c) it bursts at once (d) it turns yellow
24. 24.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) steam (c) smoke (d) air from outside
25. 25.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) dry yeast (c) a mirror (d) warm water
26. 26.⚖️ 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
27. 27.🍞 Which of these is something yeast does not need? (a) time (b) a magnet (c) warm water (d) sugar
28. 28.🔍 Which is the odd one out? (a) sunlight (b) sugar (c) salt (d) vinegar
29. 29.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it grows faster (c) it turns to sugar (d) it glows
30. 30.⚖️ 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) False (b) True
31. 31.🍞 Which of these is something yeast does not need? (a) sugar (b) vinegar (c) time (d) warm water
32. 32.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) turmeric powder (c) dry yeast (d) a paper clip
33. 33.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) warm water (c) a paper clip (d) dry yeast
34. 34.🧺 Which of these is not needed for the yeast balloon? (a) a battery cell (b) warm water (c) a balloon (d) sugar
35. 35.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
36. 36.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) a paper clip (c) a comb (d) a mirror
37. 37.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
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.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
40. 40.True or false: sugar is not needed for the yeast balloon. (a) True (b) False

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