Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 307 · 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? What do we do with “the amount of water”? (a) we keep it the same (b) we change it (c) we measure it
2. 2.True or false: warm water is something yeast needs. (a) False (b) True
3. 3.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a mirror (c) a battery cell (d) a small bottle
4. 4.True or false: time is something yeast does not need. (a) True (b) False
5. 5.🔍 Which is the odd one out? (a) sugar (b) warm water (c) time (d) salt
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 amount of sugar (b) the amount of water (c) the water temperature (d) the amount of yeast
7. 7.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) air from outside (c) smoke (d) carbon dioxide gas
8. 8.⚖️ 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
9. 9.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is kept the same. (a) True (b) False
10. 10.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
11. 11.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
12. 12.True or false: warm water is needed for the yeast balloon. (a) False (b) True
13. 13.🛟 The water for the yeast should be ___. (a) very salty (b) warm, not hot (c) ice cold (d) boiling hot
14. 14.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
15. 15.⚖️ 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 amount of water (c) the amount of sugar (d) the same bottles
16. 16.🔍 Which is the odd one out? (a) time (b) vinegar (c) sugar (d) warm water
17. 17.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
18. 18.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) warm water (d) a magnet
19. 19.🔮 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 grows faster (d) it glows
20. 20.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it sweet (c) to make it heavy (d) it is food for yeast
21. 21.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
22. 22.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) a comb (c) a paper clip (d) a battery cell
23. 23.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
24. 24.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is the one thing we change. (a) False (b) True
25. 25.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to colour rice (c) to wash dishes (d) to clean floors
26. 26.True or false: a magnet is needed for the yeast balloon. (a) False (b) True
27. 27.True or false: warm water is something yeast does not need. (a) False (b) True
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) warm water (c) a mirror (d) sugar
29. 29.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) it turns to bread (c) the balloon is smaller (d) the balloon is bigger
30. 30.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is the one thing we change. (a) False (b) True
31. 31.📘 What is yeast? (a) a kind of sugar (b) a kind of stone (c) a kind of salt (d) a tiny living fungus
32. 32.⚖️ 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
33. 33.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
34. 34.True or false: salt is something yeast needs. (a) True (b) False
35. 35.🍞 Which of these is something yeast needs? (a) salt (b) time (c) vinegar (d) a magnet
36. 36.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a battery cell (c) a balloon (d) warm water
37. 37.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
38. 38.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
39. 39.True or false: a mirror is needed for the yeast balloon. (a) True (b) False
40. 40.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) put it in your mouth (c) keep it for a month (d) throw it at a wall

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