Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 838 · 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) pour it down the sink (b) put it in your mouth (c) keep it for a month (d) throw it at a wall
2. 2.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold water is heavy (c) cold slows yeast down (d) cold makes it pink
3. 3.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) turmeric powder (c) a small bottle (d) a balloon
4. 4.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a battery cell (c) sugar (d) warm water
5. 5.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) time (d) vinegar
6. 6.True or false: warm water is something yeast does not need. (a) True (b) False
7. 7.⚖️ 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) True (b) False
8. 8.🍞 Which of these is something yeast does not need? (a) salt (b) warm water (c) sugar (d) time
9. 9.⚖️ 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 change it (b) we keep it the same (c) we measure it
10. 10.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it bursts at once (c) it grows much faster (d) it grows very little
11. 11.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
12. 12.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to make bread rise (c) to clean floors (d) to colour rice
13. 13.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the same bottles (b) size of the balloon (c) the water temperature
14. 14.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) turmeric powder (c) dry yeast (d) a balloon
15. 15.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) a magnet (d) sugar
16. 16.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
17. 17.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a paper clip (c) a comb (d) warm water
18. 18.🛟 The water for the yeast should be ___. (a) boiling hot (b) warm, not hot (c) ice cold (d) very salty
19. 19.🔍 Which is the odd one out? (a) warm water (b) sugar (c) time (d) a magnet
20. 20.True or false: a magnet is something yeast does not need. (a) False (b) True
21. 21.🔍 Which is the odd one out? (a) time (b) sugar (c) warm water (d) sunlight
22. 22.⚖️ 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 measure it (b) we keep it the same (c) we change it
23. 23.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) it shrinks to nothing (c) the balloon is bigger (d) it turns to bread
24. 24.🧺 Which of these is not needed for the yeast balloon? (a) a paper clip (b) sugar (c) a small bottle (d) dry yeast
25. 25.True or false: sunlight is something yeast does not need. (a) True (b) False
26. 26.🍞 Which of these is something yeast needs? (a) salt (b) a magnet (c) time (d) vinegar
27. 27.True or false: time is something yeast does not need. (a) False (b) True
28. 28.⚖️ 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
29. 29.⚖️ 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) False (b) True
30. 30.⚖️ 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) size of the balloon (b) the water temperature (c) the amount of water (d) the amount of sugar
31. 31.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
32. 32.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) carbon dioxide gas (c) air from outside (d) smoke
33. 33.⚖️ 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
34. 34.⚖️ 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
35. 35.True or false: sunlight is something yeast needs. (a) True (b) False
36. 36.⚖️ 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 water temperature (c) the amount of sugar
37. 37.🔍 Which is the odd one out? (a) salt (b) a magnet (c) sunlight (d) time
38. 38.🧺 Which of these is needed for the yeast balloon? (a) dry yeast (b) a battery cell (c) a paper clip (d) a mirror
39. 39.⚖️ 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) True (b) False
40. 40.🔍 Which is the odd one out? (a) sunlight (b) vinegar (c) salt (d) sugar

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