Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 937 · 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.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) sugar (c) a mirror (d) a balloon
2. 2.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) sunlight (d) sugar
3. 3.⚖️ 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) size of the balloon (b) the water temperature (c) the amount of yeast (d) the amount of sugar
4. 4.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is kept the same. (a) True (b) False
5. 5.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to make it sweet (c) to make it heavy (d) to colour it
6. 6.⚖️ 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 measure it (b) we change it (c) we keep it the same
7. 7.🛟 The water for the yeast should be ___. (a) very salty (b) ice cold (c) boiling hot (d) warm, not hot
8. 8.True or false: time is something yeast does not need. (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 sugar is kept the same. (a) True (b) False
10. 10.🔍 Which is the odd one out? (a) salt (b) sugar (c) a magnet (d) vinegar
11. 11.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
12. 12.True or false: a magnet is something yeast needs. (a) True (b) False
13. 13.True or false: sugar is something yeast needs. (a) True (b) False
14. 14.⚖️ 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 keep it the same (c) we change it
15. 15.True or false: a balloon is not needed for the yeast balloon. (a) False (b) True
16. 16.True or false: a small bottle is needed for the yeast balloon. (a) False (b) True
17. 17.📘 What is yeast? (a) a tiny living fungus (b) a kind of sugar (c) a kind of stone (d) a kind of salt
18. 18.🔍 Which is the odd one out? (a) sugar (b) time (c) warm water (d) salt
19. 19.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
20. 20.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) warm water (c) a battery cell (d) sugar
21. 21.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
22. 22.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
23. 23.🔍 Which is the odd one out? (a) time (b) sugar (c) a magnet (d) warm water
24. 24.⚖️ 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 same bottles (c) the amount of yeast (d) size of the balloon
25. 25.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) dry yeast (c) turmeric powder (d) a magnet
26. 26.🔍 Which is the odd one out? (a) sunlight (b) salt (c) time (d) vinegar
27. 27.🔍 Which is the odd one out? (a) warm water (b) salt (c) sunlight (d) vinegar
28. 28.🧺 Which of these is not needed for the yeast balloon? (a) sugar (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? True or false: size of the balloon is what we measure. (a) True (b) False
30. 30.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) a small bottle (d) a paper clip
31. 31.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is what we measure. (a) True (b) False
32. 32.True or false: sunlight is something yeast needs. (a) True (b) False
33. 33.True or false: warm water is needed for the yeast balloon. (a) False (b) True
34. 34.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold makes it pink (c) cold kills sugar (d) cold slows yeast down
35. 35.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the amount of yeast (b) the water temperature (c) size of the balloon
36. 36.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
37. 37.True or false: a balloon is needed for the yeast balloon. (a) True (b) False
38. 38.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a balloon (c) dry yeast (d) turmeric powder
39. 39.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) air from outside (c) carbon dioxide gas (d) steam
40. 40.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) sugar (c) a magnet (d) warm water

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