Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 248 · 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.⚖️ 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 water temperature (d) the amount of sugar
2. 2.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
3. 3.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) a mirror (d) a balloon
4. 4.🍞 Why do we add sugar to the yeast? (a) to colour it (b) it is food for yeast (c) to make it heavy (d) to make it sweet
5. 5.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
6. 6.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
7. 7.📘 What is yeast? (a) a kind of stone (b) a kind of sugar (c) a tiny living fungus (d) a kind of salt
8. 8.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a mirror (c) a battery cell (d) warm water
9. 9.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
10. 10.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is bigger (c) the balloon is smaller (d) it shrinks to nothing
11. 11.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) keep it for a month (c) throw it at a wall (d) put it in your mouth
12. 12.⚖️ 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 change it (b) we measure it (c) we keep it the same
13. 13.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it turns yellow (c) it grows very little (d) it grows much faster
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 keep it the same (b) we change it (c) we measure it
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 water temperature (b) size of the balloon (c) the amount of sugar
16. 16.🛟 The water for the yeast should be ___. (a) very salty (b) ice cold (c) warm, not hot (d) boiling hot
17. 17.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
18. 18.True or false: sunlight is something yeast does not need. (a) True (b) False
19. 19.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) carbon dioxide gas (c) smoke (d) steam
20. 20.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is kept the same. (a) True (b) False
21. 21.🔍 Which is the odd one out? (a) vinegar (b) salt (c) sunlight (d) time
22. 22.🍞 Which of these is something yeast needs? (a) a magnet (b) time (c) vinegar (d) sunlight
23. 23.True or false: sugar is something yeast needs. (a) False (b) True
24. 24.🔍 Which is the odd one out? (a) sugar (b) warm water (c) time (d) vinegar
25. 25.True or false: a magnet is something yeast needs. (a) True (b) False
26. 26.🧺 Which of these is needed for the yeast balloon? (a) dry yeast (b) a magnet (c) a comb (d) turmeric powder
27. 27.⚖️ 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 change it (c) we measure it
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a paper clip (c) sugar (d) a small bottle
29. 29.🍞 Which of these is something yeast needs? (a) salt (b) a magnet (c) warm water (d) vinegar
30. 30.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) warm water (c) dry yeast (d) a comb
31. 31.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of yeast”? (a) we keep it the same (b) we change it (c) we measure it
32. 32.True or false: salt is something yeast needs. (a) True (b) False
33. 33.🔍 Which is the odd one out? (a) salt (b) sugar (c) sunlight (d) a magnet
34. 34.True or false: a comb is not needed for the yeast balloon. (a) True (b) False
35. 35.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) warm water (c) turmeric powder (d) sugar
36. 36.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold makes it pink (c) cold water is heavy (d) cold kills sugar
37. 37.True or false: time is something yeast needs. (a) True (b) False
38. 38.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
39. 39.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a balloon (c) sugar (d) a magnet
40. 40.🔍 Which is the odd one out? (a) warm water (b) time (c) sunlight (d) sugar

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