Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 225 · 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 is the odd one out? (a) time (b) sugar (c) a magnet (d) warm water
2. 2.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
3. 3.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a small bottle (c) dry yeast (d) a comb
4. 4.📘 What is yeast? (a) a kind of sugar (b) a kind of stone (c) a kind of salt (d) a tiny living fungus
5. 5.⚖️ 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 amount of water
6. 6.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) pour it down the sink (c) throw it at a wall (d) put it in your mouth
7. 7.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
8. 8.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is the one thing we change. (a) False (b) True
9. 9.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a balloon (c) a paper clip (d) a battery cell
10. 10.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
11. 11.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
12. 12.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a comb (c) dry yeast (d) turmeric powder
13. 13.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
14. 14.True or false: sugar is something yeast does not need. (a) False (b) True
15. 15.🛟 The water for the yeast should be ___. (a) boiling hot (b) very salty (c) warm, not hot (d) ice cold
16. 16.🔍 Which is the odd one out? (a) time (b) sunlight (c) a magnet (d) salt
17. 17.⚖️ 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 water (c) the amount of sugar (d) size of the balloon
18. 18.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a battery cell (c) a mirror (d) warm water
19. 19.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to colour it (c) to make it heavy (d) it is food for yeast
20. 20.⚖️ 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
21. 21.⚖️ 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 keep it the same (b) we measure it (c) we change it
22. 22.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) steam (c) air from outside (d) smoke
23. 23.True or false: sunlight is something yeast does not need. (a) True (b) False
24. 24.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
25. 25.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
26. 26.🍞 Which of these is something yeast needs? (a) sunlight (b) salt (c) a magnet (d) time
27. 27.⚖️ 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
28. 28.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
29. 29.⚖️ 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
30. 30.🔍 Which is the odd one out? (a) sugar (b) warm water (c) sunlight (d) time
31. 31.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is the one thing we change. (a) True (b) False
32. 32.🍞 Which of these is something yeast needs? (a) sunlight (b) a magnet (c) warm water (d) salt
33. 33.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to wash dishes (c) to clean floors (d) to colour rice
34. 34.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is what we measure. (a) False (b) True
35. 35.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a balloon (c) turmeric powder (d) dry yeast
36. 36.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
37. 37.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
38. 38.True or false: time is something yeast needs. (a) True (b) False
39. 39.🍞 Which of these is something yeast needs? (a) sunlight (b) salt (c) a magnet (d) sugar
40. 40.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) a balloon (d) a paper clip

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