Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 946 · 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 needed for the yeast balloon? (a) sugar (b) a magnet (c) a comb (d) a battery cell
2. 2.⚖️ 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
3. 3.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold slows yeast down (c) cold water is heavy (d) cold kills sugar
4. 4.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
5. 5.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) throw it at a wall (c) put it in your mouth (d) keep it for a month
6. 6.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) a small bottle (d) a mirror
7. 7.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) smoke (c) carbon dioxide gas (d) air from outside
8. 8.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the amount of sugar (b) the same bottles (c) size of the balloon (d) the water temperature
9. 9.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to clean floors (c) to colour rice (d) to make bread rise
10. 10.True or false: a magnet is something yeast does not need. (a) False (b) True
11. 11.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
12. 12.🍞 Which of these is something yeast needs? (a) vinegar (b) sunlight (c) salt (d) sugar
13. 13.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it turns to sugar (c) it glows (d) it grows faster
14. 14.🔍 Which is the odd one out? (a) a magnet (b) sunlight (c) warm water (d) vinegar
15. 15.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
16. 16.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it heavy (c) it is food for yeast (d) to make it sweet
17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) a paper clip (d) sugar
18. 18.⚖️ 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
19. 19.⚖️ 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
20. 20.🔍 Which is the odd one out? (a) vinegar (b) sunlight (c) time (d) salt
21. 21.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
22. 22.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is bigger (c) the balloon is smaller (d) it shrinks to nothing
23. 23.True or false: sunlight is something yeast needs. (a) False (b) True
24. 24.🔮 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
25. 25.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
26. 26.⚖️ 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
27. 27.🔍 Which is the odd one out? (a) warm water (b) sugar (c) a magnet (d) time
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a balloon (c) a magnet (d) dry yeast
29. 29.⚖️ 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 keep it the same (b) we change it (c) we measure it
30. 30.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
31. 31.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a mirror (c) a balloon (d) a paper clip
32. 32.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) sugar (c) dry yeast (d) a magnet
33. 33.True or false: a battery cell is needed for the yeast balloon. (a) False (b) True
34. 34.🛟 The water for the yeast should be ___. (a) ice cold (b) very salty (c) warm, not hot (d) boiling hot
35. 35.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a comb (c) dry yeast (d) warm water
36. 36.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
37. 37.⚖️ 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 measure it (b) we change it (c) we keep it the same
38. 38.⚖️ 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
39. 39.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
40. 40.⚖️ 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) False (b) True

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