Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 822 · 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 turmeric powder for the yeast balloon? (a) not needed (b) needed
2. 2.⚖️ 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 change it (c) we measure it
3. 3.True or false: salt is something yeast needs. (a) False (b) True
4. 4.⚖️ 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) False (b) True
5. 5.🛟 The water for the yeast should be ___. (a) ice cold (b) very salty (c) boiling hot (d) warm, not hot
6. 6.True or false: time is something yeast does not need. (a) False (b) True
7. 7.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
8. 8.⚖️ 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) False (b) True
9. 9.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
10. 10.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
11. 11.⚖️ 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 keep it the same (c) we change it
12. 12.⚖️ 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) False (b) True
13. 13.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) air from outside (c) carbon dioxide gas (d) smoke
14. 14.📘 What is yeast? (a) a kind of sugar (b) a tiny living fungus (c) a kind of salt (d) a kind of stone
15. 15.⚖️ 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) size of the balloon (c) the water temperature
16. 16.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is kept the same. (a) True (b) False
17. 17.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to make it heavy (c) it is food for yeast (d) to colour it
18. 18.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a mirror (c) a magnet (d) a small bottle
19. 19.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to make bread rise (c) to wash dishes (d) to clean floors
20. 20.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) a balloon (d) a magnet
21. 21.True or false: sugar is something yeast does not need. (a) True (b) False
22. 22.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold water is heavy (c) cold slows yeast down (d) cold makes it pink
23. 23.🔍 Which is the odd one out? (a) sugar (b) warm water (c) time (d) sunlight
24. 24.True or false: sugar is something yeast needs. (a) False (b) True
25. 25.True or false: sugar is needed for the yeast balloon. (a) False (b) True
26. 26.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) keep it for a month (c) pour it down the sink (d) throw it at a wall
27. 27.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
28. 28.🔍 Which is the odd one out? (a) warm water (b) sunlight (c) salt (d) vinegar
29. 29.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) dry yeast (c) a magnet (d) a mirror
30. 30.⚖️ 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) True (b) False
31. 31.⚖️ 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 change it (b) we measure it (c) we keep it the same
32. 32.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) dry yeast (c) a magnet (d) a small bottle
33. 33.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) the balloon is bigger (c) it shrinks to nothing (d) it turns to bread
34. 34.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
35. 35.🔍 Which is the odd one out? (a) a magnet (b) time (c) warm water (d) sugar
36. 36.True or false: turmeric powder is needed for the yeast balloon. (a) False (b) True
37. 37.⚖️ 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) False (b) True
38. 38.⚖️ 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
39. 39.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows much faster (c) it bursts at once (d) it grows very little
40. 40.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) sugar (d) a mirror

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