Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 875 · 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) the amount of water (c) the water temperature (d) size of the balloon
2. 2.🔍 Which is the odd one out? (a) sunlight (b) vinegar (c) salt (d) time
3. 3.⚖️ 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
4. 4.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) smoke (c) steam (d) carbon dioxide gas
5. 5.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a small bottle (c) dry yeast (d) turmeric powder
6. 6.⚖️ 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 same bottles (b) the amount of yeast (c) the water temperature (d) size of the balloon
7. 7.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is smaller (c) it turns to bread (d) the balloon is bigger
8. 8.🍞 Which of these is something yeast does not need? (a) salt (b) warm water (c) time (d) sugar
9. 9.🍞 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
10. 10.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
11. 11.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a comb (c) a paper clip (d) dry yeast
12. 12.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
13. 13.🔍 Which is the odd one out? (a) a magnet (b) sugar (c) vinegar (d) salt
14. 14.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to wash dishes (c) to make bread rise (d) to colour rice
15. 15.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) pour it down the sink (c) put it in your mouth (d) keep it for a month
16. 16.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of sugar”? (a) we measure it (b) we keep it the same (c) we change it
17. 17.⚖️ 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) True (b) False
18. 18.⚖️ 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
19. 19.🛟 The water for the yeast should be ___. (a) warm, not hot (b) ice cold (c) very salty (d) boiling hot
20. 20.⚖️ 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
21. 21.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
22. 22.🍞 Which of these is something yeast needs? (a) sunlight (b) warm water (c) vinegar (d) a magnet
23. 23.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) turmeric powder (c) a mirror (d) a paper clip
24. 24.True or false: a comb is not needed for the yeast balloon. (a) False (b) True
25. 25.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows very little (c) it bursts at once (d) it grows much faster
26. 26.⚖️ 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
27. 27.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it turns to sugar (c) it glows (d) it grows faster
28. 28.📘 What is yeast? (a) a tiny living fungus (b) a kind of stone (c) a kind of sugar (d) a kind of salt
29. 29.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a balloon (c) a small bottle (d) a mirror
30. 30.🔍 Which is the odd one out? (a) a magnet (b) warm water (c) time (d) sugar
31. 31.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
32. 32.True or false: a battery cell is needed for the yeast balloon. (a) True (b) False
33. 33.True or false: a mirror is not needed for the yeast balloon. (a) False (b) True
34. 34.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) turmeric powder (c) sugar (d) dry yeast
35. 35.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) time (d) vinegar
36. 36.⚖️ 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
37. 37.True or false: warm water is something yeast does not need. (a) False (b) True
38. 38.True or false: sunlight is something yeast does not need. (a) False (b) True
39. 39.True or false: a balloon is not needed for the yeast balloon. (a) False (b) True
40. 40.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a magnet (c) a balloon (d) a comb

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