Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 60 · 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 dry yeast for the yeast balloon? (a) needed (b) not needed
2. 2.🔍 Which is the odd one out? (a) time (b) vinegar (c) a magnet (d) sunlight
3. 3.🛟 The water for the yeast should be ___. (a) ice cold (b) boiling hot (c) warm, not hot (d) very salty
4. 4.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) dry yeast (c) a paper clip (d) sugar
5. 5.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) sugar (c) turmeric powder (d) dry yeast
6. 6.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) turmeric powder (c) a paper clip (d) a balloon
7. 7.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) warm water (c) sugar (d) a battery cell
8. 8.🔍 Which is the odd one out? (a) time (b) a magnet (c) sugar (d) warm water
9. 9.True or false: warm water is something yeast does not need. (a) False (b) True
10. 10.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) it shrinks to nothing (c) it turns to bread (d) the balloon is smaller
11. 11.True or false: a magnet is not needed for the yeast balloon. (a) False (b) True
12. 12.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) air from outside (c) smoke (d) carbon dioxide gas
13. 13.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
14. 14.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
15. 15.⚖️ 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) the amount of sugar (c) size of the balloon (d) the same bottles
16. 16.🔍 Which is the odd one out? (a) a magnet (b) vinegar (c) salt (d) sugar
17. 17.⚖️ 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 keep it the same (b) we change it (c) we measure it
18. 18.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a paper clip (c) a small bottle (d) a magnet
19. 19.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
20. 20.True or false: a battery cell is not needed for the yeast balloon. (a) True (b) False
21. 21.True or false: dry yeast is needed for the yeast balloon. (a) False (b) True
22. 22.True or false: salt is something yeast needs. (a) True (b) False
23. 23.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it turns yellow (c) it bursts at once (d) it grows very little
24. 24.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
25. 25.🧺 Which of these is not needed for the yeast balloon? (a) a magnet (b) warm water (c) dry yeast (d) sugar
26. 26.⚖️ 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
27. 27.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a balloon (d) a magnet
28. 28.True or false: a magnet is needed for the yeast balloon. (a) False (b) True
29. 29.📘 What is yeast? (a) a tiny living fungus (b) a kind of salt (c) a kind of sugar (d) a kind of stone
30. 30.True or false: a magnet is something yeast needs. (a) True (b) False
31. 31.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
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 measure it (c) we change it
33. 33.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) salt (d) time
34. 34.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
35. 35.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
36. 36.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold kills sugar (c) cold makes it pink (d) cold water is heavy
37. 37.🍞 Which of these is something yeast needs? (a) vinegar (b) salt (c) sugar (d) sunlight
38. 38.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) warm water (c) a comb (d) a paper clip
39. 39.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
40. 40.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it

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