Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 504 · 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 warm water for the yeast balloon? (a) not needed (b) needed
2. 2.True or false: a balloon is needed for the yeast balloon. (a) False (b) True
3. 3.🔮 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
4. 4.⚖️ 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 amount of sugar (b) the amount of yeast (c) size of the balloon (d) the water temperature
5. 5.⚖️ 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 water temperature (c) the amount of water (d) size of the balloon
6. 6.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) sugar (c) a balloon (d) a mirror
7. 7.True or false: a comb is not needed for the yeast balloon. (a) True (b) False
8. 8.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows much faster (c) it turns yellow (d) it grows very little
9. 9.⚖️ 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
10. 10.⚖️ 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 change it (c) we keep it the same
11. 11.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
12. 12.⚖️ 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
13. 13.🔍 Which is the odd one out? (a) sugar (b) vinegar (c) warm water (d) time
14. 14.🛟 The water for the yeast should be ___. (a) boiling hot (b) warm, not hot (c) very salty (d) ice cold
15. 15.⚖️ 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
16. 16.True or false: a magnet is not needed for the yeast balloon. (a) True (b) False
17. 17.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) steam (c) smoke (d) carbon dioxide gas
18. 18.True or false: vinegar is something yeast does not need. (a) False (b) True
19. 19.🔍 Which is the odd one out? (a) a magnet (b) vinegar (c) sunlight (d) time
20. 20.🔍 Which is the odd one out? (a) time (b) salt (c) warm water (d) sugar
21. 21.📘 What is yeast? (a) a kind of stone (b) a kind of sugar (c) a kind of salt (d) a tiny living fungus
22. 22.True or false: a balloon is not needed for the yeast balloon. (a) False (b) True
23. 23.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
24. 24.🍞 Which of these is something yeast does not need? (a) warm water (b) sunlight (c) time (d) sugar
25. 25.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
26. 26.⚖️ 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) True (b) False
27. 27.True or false: a magnet is something yeast does not need. (a) False (b) True
28. 28.🍞 Which of these is something yeast needs? (a) vinegar (b) sunlight (c) warm water (d) salt
29. 29.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it glows (c) it grows faster (d) it turns to sugar
30. 30.⚖️ 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 keep it the same (b) we measure it (c) we change it
31. 31.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) dry yeast (c) sugar (d) a balloon
32. 32.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a magnet (c) warm water (d) sugar
33. 33.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) put it in your mouth (c) keep it for a month (d) pour it down the sink
34. 34.⚖️ 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
35. 35.True or false: a battery cell is needed for the yeast balloon. (a) True (b) False
36. 36.⚖️ 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 keep it the same (c) we measure it
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 the one thing we change. (a) False (b) True
38. 38.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
39. 39.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to make bread rise (c) to colour rice (d) to wash dishes
40. 40.⚖️ 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) True (b) False

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