Yeast Balloon Experiment Worksheet

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

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