Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 988 · 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.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
2. 2.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the water temperature (b) the amount of water (c) size of the balloon
3. 3.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) put it in your mouth (c) pour it down the sink (d) keep it for a month
4. 4.🛟 The water for the yeast should be ___. (a) ice cold (b) very salty (c) warm, not hot (d) boiling hot
5. 5.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is kept the same. (a) True (b) False
6. 6.True or false: a mirror is not needed for the yeast balloon. (a) False (b) True
7. 7.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
8. 8.📘 What is yeast? (a) a kind of stone (b) a tiny living fungus (c) a kind of sugar (d) a kind of salt
9. 9.🍞 Which of these is something yeast does not need? (a) time (b) salt (c) warm water (d) sugar
10. 10.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) turmeric powder (c) a paper clip (d) dry yeast
11. 11.🔍 Which is the odd one out? (a) time (b) salt (c) warm water (d) sugar
12. 12.True or false: a battery cell is needed for the yeast balloon. (a) False (b) True
13. 13.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) the balloon is smaller (c) it turns to bread (d) it shrinks to nothing
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 amount of yeast (b) the amount of sugar (c) size of the balloon (d) the water temperature
15. 15.True or false: a paper clip is needed for the yeast balloon. (a) True (b) False
16. 16.🍞 Which of these is something yeast needs? (a) sugar (b) vinegar (c) sunlight (d) a magnet
17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) dry yeast (c) a small bottle (d) sugar
18. 18.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
19. 19.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
20. 20.True or false: a balloon is needed for the yeast balloon. (a) False (b) True
21. 21.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
22. 22.True or false: time is something yeast needs. (a) True (b) False
23. 23.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to make it sweet (c) to make it heavy (d) to colour it
24. 24.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) carbon dioxide gas (c) steam (d) smoke
25. 25.🔮 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
26. 26.⚖️ 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 change it (b) we keep it the same (c) we measure it
27. 27.True or false: warm water is something yeast needs. (a) False (b) True
28. 28.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
29. 29.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) turmeric powder (c) sugar (d) warm water
30. 30.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
31. 31.🍞 Which of these is something yeast needs? (a) time (b) vinegar (c) salt (d) sunlight
32. 32.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the water temperature”? (a) we keep it the same (b) we change it (c) we measure it
33. 33.⚖️ 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
34. 34.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
35. 35.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a mirror (c) a paper clip (d) sugar
36. 36.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) a small bottle (d) a paper clip
37. 37.⚖️ 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
38. 38.True or false: warm water is needed for the yeast balloon. (a) False (b) True
39. 39.🍞 Which of these is something yeast does not need? (a) a magnet (b) sugar (c) time (d) warm water
40. 40.🔍 Which is the odd one out? (a) sugar (b) salt (c) a magnet (d) vinegar

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