Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 948 · 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 something yeast needs? (a) sugar (b) sunlight (c) salt (d) a magnet
2. 2.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a paper clip (c) warm water (d) a balloon
3. 3.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is smaller (c) it shrinks to nothing (d) the balloon is bigger
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) warm water (c) sugar (d) a mirror
5. 5.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) steam (c) carbon dioxide gas (d) air from outside
6. 6.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
7. 7.🛟 The water for the yeast should be ___. (a) warm, not hot (b) boiling hot (c) very salty (d) ice cold
8. 8.⚖️ 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
9. 9.🔍 Which is the odd one out? (a) sunlight (b) warm water (c) vinegar (d) a magnet
10. 10.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to make bread rise (c) to wash dishes (d) to colour rice
11. 11.🧺 Which of these is not needed for the yeast balloon? (a) a comb (b) sugar (c) a small bottle (d) warm water
12. 12.True or false: salt is something yeast needs. (a) True (b) False
13. 13.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows much faster (c) it grows very little (d) it turns yellow
14. 14.🍞 Which of these is something yeast does not need? (a) salt (b) warm water (c) sugar (d) time
15. 15.True or false: a magnet is needed for the yeast balloon. (a) False (b) True
16. 16.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) throw it at a wall (c) keep it for a month (d) pour it down the sink
17. 17.🍞 Which of these is something yeast needs? (a) sunlight (b) salt (c) warm water (d) vinegar
18. 18.🔍 Which is the odd one out? (a) time (b) warm water (c) a magnet (d) sugar
19. 19.True or false: a small bottle is 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 kept the same? (a) the amount of sugar (b) the water temperature (c) size of the balloon
21. 21.📘 What is yeast? (a) a kind of stone (b) a kind of salt (c) a kind of sugar (d) a tiny living fungus
22. 22.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a small bottle (c) dry yeast (d) turmeric powder
23. 23.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a battery cell (c) dry yeast (d) warm water
24. 24.True or false: a mirror is not needed for the yeast balloon. (a) False (b) True
25. 25.True or false: a comb is not needed for the yeast balloon. (a) False (b) True
26. 26.🍞 Which of these is something yeast needs? (a) salt (b) a magnet (c) vinegar (d) time
27. 27.🔍 Which is the odd one out? (a) sunlight (b) a magnet (c) salt (d) sugar
28. 28.⚖️ 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) False (b) True
29. 29.🔍 Which is the odd one out? (a) sugar (b) sunlight (c) time (d) warm water
30. 30.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is kept the same. (a) False (b) True
31. 31.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) warm water (c) a comb (d) dry yeast
32. 32.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
33. 33.True or false: vinegar is something yeast needs. (a) True (b) False
34. 34.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
35. 35.⚖️ 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
36. 36.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a mirror (c) a battery cell (d) a small bottle
37. 37.True or false: time is something yeast does not need. (a) True (b) False
38. 38.⚖️ 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) size of the balloon (c) the amount of yeast
39. 39.🔍 Which is the odd one out? (a) warm water (b) vinegar (c) time (d) sugar
40. 40.True or false: a comb is needed for the yeast balloon. (a) False (b) True

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