Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 777 · 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.📘 What is yeast? (a) a kind of stone (b) a tiny living fungus (c) a kind of sugar (d) a kind of salt
2. 2.⚖️ 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 yeast (b) size of the balloon (c) the amount of water (d) the amount of sugar
3. 3.🔍 Which is the odd one out? (a) sunlight (b) a magnet (c) time (d) vinegar
4. 4.🍞 Which of these is something yeast needs? (a) salt (b) time (c) sunlight (d) vinegar
5. 5.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
6. 6.True or false: vinegar is something yeast needs. (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 water is the one thing we change. (a) False (b) True
8. 8.⚖️ 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 amount of sugar (b) size of the balloon (c) the same bottles (d) the water temperature
9. 9.True or false: salt is something yeast does not need. (a) True (b) False
10. 10.True or false: a magnet is something yeast does not need. (a) True (b) False
11. 11.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it turns to sugar (c) it grows faster (d) the yeast is killed
12. 12.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a battery cell (c) a mirror (d) dry yeast
13. 13.🍞 Which of these is something yeast does not need? (a) a magnet (b) sugar (c) time (d) warm water
14. 14.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the same bottles”? (a) we measure it (b) we keep it the same (c) we change it
15. 15.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
16. 16.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a mirror (c) a small bottle (d) warm water
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 water”? (a) we keep it the same (b) we measure it (c) we change it
18. 18.⚖️ 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) size of the balloon (c) the amount of sugar
19. 19.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to wash dishes (c) to colour rice (d) to make bread rise
20. 20.True or false: sugar is needed for the yeast balloon. (a) True (b) False
21. 21.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
22. 22.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) air from outside (c) carbon dioxide gas (d) steam
23. 23.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a battery cell (c) warm water (d) a balloon
24. 24.⚖️ 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
25. 25.⚖️ 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 yeast (c) the water temperature
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) True (b) False
27. 27.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) warm water (c) turmeric powder (d) a mirror
28. 28.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) time (d) vinegar
29. 29.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
30. 30.🍞 Which of these is something yeast does not need? (a) warm water (b) sunlight (c) sugar (d) time
31. 31.🔍 Which is the odd one out? (a) time (b) warm water (c) salt (d) sugar
32. 32.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
33. 33.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is bigger (c) the balloon is smaller (d) it turns to bread
34. 34.⚖️ 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
35. 35.🛟 The water for the yeast should be ___. (a) very salty (b) warm, not hot (c) ice cold (d) boiling hot
36. 36.True or false: warm water is something yeast does not need. (a) False (b) True
37. 37.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) a comb (d) a balloon
38. 38.🍞 Which of these is something yeast does not need? (a) salt (b) time (c) warm water (d) sugar
39. 39.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is what we measure. (a) False (b) True
40. 40.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed

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