Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 124 · 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: sugar is something yeast needs. (a) True (b) False
2. 2.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
3. 3.⚖️ 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 change it (c) we keep it the same
4. 4.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) sugar (c) dry yeast (d) a battery cell
5. 5.True or false: a small bottle is needed for the yeast balloon. (a) False (b) True
6. 6.🛟 The water for the yeast should be ___. (a) ice cold (b) warm, not hot (c) boiling hot (d) very salty
7. 7.⚖️ 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 keep it the same (c) we change it
8. 8.⚖️ 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
9. 9.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a balloon (c) dry yeast (d) a magnet
10. 10.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) air from outside (c) smoke (d) steam
11. 11.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is the one thing we change. (a) True (b) False
12. 12.🔍 Which is the odd one out? (a) time (b) warm water (c) salt (d) sugar
13. 13.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) a balloon (c) warm water (d) dry yeast
14. 14.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) sugar (c) a mirror (d) dry yeast
15. 15.📘 What is yeast? (a) a kind of stone (b) a kind of salt (c) a tiny living fungus (d) a kind of sugar
16. 16.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
17. 17.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
18. 18.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to colour it (c) to make it sweet (d) it is food for yeast
19. 19.⚖️ 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 measure it (b) we keep it the same (c) we change it
20. 20.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
21. 21.⚖️ 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
22. 22.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) throw it at a wall (c) pour it down the sink (d) keep it for a month
23. 23.True or false: sugar is needed for the yeast balloon. (a) True (b) False
24. 24.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold makes it pink (c) cold kills sugar (d) cold water is heavy
25. 25.True or false: salt is something yeast needs. (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) False (b) True
27. 27.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to make bread rise (c) to clean floors (d) to wash dishes
28. 28.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) turmeric powder (c) a mirror (d) a small bottle
29. 29.True or false: a magnet is something yeast needs. (a) True (b) False
30. 30.⚖️ 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 change it (b) we keep it the same (c) we measure it
31. 31.⚖️ 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
32. 32.⚖️ 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 yeast
33. 33.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
34. 34.🔮 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
35. 35.⚖️ 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) size of the balloon (c) the water temperature (d) the amount of water
36. 36.🔍 Which is the odd one out? (a) sugar (b) a magnet (c) vinegar (d) sunlight
37. 37.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
38. 38.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a paper clip (c) a battery cell (d) dry yeast
39. 39.🔍 Which is the odd one out? (a) sugar (b) time (c) vinegar (d) warm water
40. 40.True or false: warm water is needed for the yeast balloon. (a) False (b) True

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