Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 202 · 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) warm water (b) sugar (c) salt (d) time
2. 2.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) sugar (c) turmeric powder (d) a small bottle
3. 3.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) the yeast is killed (c) it turns to sugar (d) it grows faster
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.🛟 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
6. 6.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows very little (c) it turns yellow (d) it grows much faster
7. 7.True or false: sunlight is something yeast needs. (a) True (b) False
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 the one thing we change. (a) True (b) False
9. 9.📘 What is yeast? (a) a kind of stone (b) a kind of salt (c) a kind of sugar (d) a tiny living fungus
10. 10.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
11. 11.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
12. 12.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) a small bottle (d) a mirror
13. 13.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a magnet (c) sugar (d) warm water
14. 14.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) the balloon is bigger (c) it turns to bread (d) it shrinks to nothing
15. 15.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
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) False (b) True
17. 17.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
18. 18.True or false: a comb is needed for the yeast balloon. (a) False (b) True
19. 19.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
20. 20.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a paper clip (c) sugar (d) a small bottle
21. 21.🍞 Which of these is something yeast needs? (a) sugar (b) sunlight (c) salt (d) vinegar
22. 22.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
23. 23.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
24. 24.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to make it sweet (c) to colour it (d) it is food for yeast
25. 25.🔍 Which is the odd one out? (a) time (b) sugar (c) warm water (d) sunlight
26. 26.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
27. 27.🍞 Which of these is something yeast does not need? (a) time (b) sunlight (c) sugar (d) warm water
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a balloon (c) turmeric powder (d) dry yeast
29. 29.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
30. 30.🔍 Which is the odd one out? (a) warm water (b) a magnet (c) sugar (d) time
31. 31.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) size of the balloon (b) the water temperature (c) the same bottles (d) the amount of sugar
32. 32.⚖️ 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
33. 33.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
34. 34.⚖️ 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 keep it the same (c) we measure it
35. 35.🛟 The water for the yeast should be ___. (a) very salty (b) boiling hot (c) warm, not hot (d) ice cold
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 water temperature (c) the amount of water
37. 37.⚖️ 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) True (b) False
38. 38.True or false: warm water is needed for the yeast balloon. (a) False (b) True
39. 39.⚖️ 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
40. 40.🍞 Which of these is something yeast needs? (a) time (b) salt (c) a magnet (d) sunlight

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