Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 375 · 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.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) it turns to bread (c) it shrinks to nothing (d) the balloon is bigger
2. 2.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
3. 3.True or false: sugar is needed for the yeast balloon. (a) True (b) False
4. 4.🍞 Which of these is something yeast does not need? (a) salt (b) warm water (c) sugar (d) time
5. 5.🔍 Which is the odd one out? (a) sugar (b) a magnet (c) salt (d) vinegar
6. 6.True or false: dry yeast is not needed for the yeast balloon. (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 water temperature is what we measure. (a) True (b) False
8. 8.True or false: a mirror is not needed for the yeast balloon. (a) True (b) False
9. 9.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is kept the same. (a) False (b) True
10. 10.⚖️ 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) the water temperature (b) the amount of yeast (c) the same bottles (d) the amount of sugar
11. 11.True or false: a mirror is needed for the yeast balloon. (a) True (b) False
12. 12.True or false: a battery cell is not needed for the yeast balloon. (a) False (b) True
13. 13.🔍 Which is the odd one out? (a) warm water (b) sunlight (c) sugar (d) time
14. 14.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) size of the balloon (b) the same bottles (c) the amount of water (d) the amount of sugar
15. 15.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it sweet (c) to make it heavy (d) it is food for yeast
16. 16.⚖️ 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 amount of sugar (c) the water temperature
17. 17.🍞 Which of these is something yeast needs? (a) sugar (b) sunlight (c) a magnet (d) vinegar
18. 18.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) warm water (d) turmeric powder
19. 19.⚖️ 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
20. 20.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) a magnet (d) warm water
21. 21.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to clean floors (c) to make bread rise (d) to wash dishes
22. 22.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold makes it pink (c) cold slows yeast down (d) cold kills sugar
23. 23.True or false: sunlight is something yeast needs. (a) True (b) False
24. 24.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) warm water (c) a magnet (d) a balloon
25. 25.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) air from outside (c) steam (d) carbon dioxide gas
26. 26.True or false: vinegar is something yeast does not need. (a) True (b) False
27. 27.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
28. 28.⚖️ 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
29. 29.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a comb (c) warm water (d) a small bottle
30. 30.📘 What is yeast? (a) a kind of sugar (b) a kind of stone (c) a tiny living fungus (d) a kind of salt
31. 31.True or false: sugar is something yeast needs. (a) False (b) True
32. 32.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
33. 33.True or false: a paper clip is needed for the yeast balloon. (a) True (b) False
34. 34.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a balloon (c) a mirror (d) a paper clip
35. 35.🔍 Which is the odd one out? (a) sugar (b) warm water (c) time (d) vinegar
36. 36.🔍 Which is the odd one out? (a) sugar (b) salt (c) time (d) warm water
37. 37.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) sugar (c) a small bottle (d) a battery cell
38. 38.🛟 The water for the yeast should be ___. (a) boiling hot (b) warm, not hot (c) very salty (d) ice cold
39. 39.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a paper clip (c) warm water (d) sugar
40. 40.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it

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