Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 235 · 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) salt (b) sunlight (c) time (d) a magnet
2. 2.True or false: a magnet is something yeast needs. (a) True (b) False
3. 3.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to make bread rise (c) to wash dishes (d) to colour rice
4. 4.🔍 Which is the odd one out? (a) sunlight (b) a magnet (c) salt (d) warm water
5. 5.⚖️ 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 measure it (c) we change it
6. 6.🛟 The water for the yeast should be ___. (a) very salty (b) warm, not hot (c) ice cold (d) boiling hot
7. 7.True or false: a small bottle is needed for the yeast balloon. (a) False (b) True
8. 8.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) the balloon is bigger (c) it shrinks to nothing (d) it turns to bread
9. 9.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) warm water (c) a small bottle (d) dry yeast
10. 10.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
11. 11.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
12. 12.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
13. 13.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it grows faster (c) the yeast is killed (d) it glows
14. 14.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a paper clip (c) sugar (d) a small bottle
15. 15.🔍 Which is the odd one out? (a) sunlight (b) a magnet (c) vinegar (d) sugar
16. 16.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a comb (c) warm water (d) sugar
17. 17.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) air from outside (c) smoke (d) steam
18. 18.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) a small bottle (d) a battery cell
19. 19.True or false: salt is something yeast needs. (a) True (b) False
20. 20.🍞 Which of these is something yeast needs? (a) sugar (b) a magnet (c) salt (d) sunlight
21. 21.⚖️ 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
22. 22.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a paper clip (c) a battery cell (d) sugar
23. 23.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is kept the same. (a) False (b) True
24. 24.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) it is food for yeast (c) to make it heavy (d) to colour it
25. 25.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the water temperature (b) size of the balloon (c) the amount of yeast (d) the same bottles
26. 26.⚖️ 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 same bottles
27. 27.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is what we measure. (a) False (b) True
28. 28.True or false: a magnet is something yeast does not need. (a) False (b) True
29. 29.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
30. 30.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
31. 31.True or false: a battery cell is needed for the yeast balloon. (a) True (b) False
32. 32.True or false: a comb is needed for the yeast balloon. (a) False (b) True
33. 33.🧺 Which of these is needed for the yeast balloon? (a) a small bottle (b) a comb (c) a battery cell (d) a magnet
34. 34.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
35. 35.🔍 Which is the odd one out? (a) sunlight (b) time (c) salt (d) a magnet
36. 36.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
37. 37.True or false: vinegar is something yeast does not need. (a) True (b) False
38. 38.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
39. 39.🍞 Which of these is something yeast needs? (a) a magnet (b) warm water (c) vinegar (d) salt
40. 40.🔍 Which is the odd one out? (a) a magnet (b) sugar (c) warm water (d) time

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