Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 929 · 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.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
3. 3.🧺 Which of these is not needed for the yeast balloon? (a) a mirror (b) sugar (c) dry yeast (d) warm water
4. 4.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it heavy (c) to make it sweet (d) it is food for yeast
5. 5.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
6. 6.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) throw it at a wall (c) keep it for a month (d) put it in your mouth
7. 7.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a comb (c) warm water (d) a balloon
8. 8.⚖️ 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
9. 9.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows much faster (c) it grows very little (d) it bursts at once
10. 10.🔍 Which is the odd one out? (a) time (b) sugar (c) salt (d) warm water
11. 11.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to colour rice (c) to clean floors (d) to wash dishes
12. 12.True or false: time is something yeast does not need. (a) False (b) True
13. 13.True or false: a paper clip is needed for the yeast balloon. (a) False (b) True
14. 14.True or false: salt is something yeast needs. (a) False (b) True
15. 15.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a balloon (c) a comb (d) a battery cell
16. 16.True or false: vinegar is something yeast does not need. (a) False (b) True
17. 17.🔍 Which is the odd one out? (a) a magnet (b) sunlight (c) vinegar (d) warm water
18. 18.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) sugar (c) a balloon (d) dry yeast
19. 19.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
20. 20.⚖️ 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
21. 21.🍞 Which of these is something yeast needs? (a) a magnet (b) vinegar (c) time (d) sunlight
22. 22.🔍 Which is the odd one out? (a) salt (b) vinegar (c) time (d) a magnet
23. 23.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
24. 24.🍞 Which of these is something yeast does not need? (a) vinegar (b) warm water (c) sugar (d) time
25. 25.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) it shrinks to nothing (c) the balloon is smaller (d) it turns to bread
26. 26.📘 What is yeast? (a) a kind of sugar (b) a kind of stone (c) a kind of salt (d) a tiny living fungus
27. 27.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) a magnet (d) warm water
28. 28.⚖️ 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
29. 29.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) smoke (c) air from outside (d) carbon dioxide gas
30. 30.⚖️ 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) size of the balloon (b) the amount of sugar (c) the water temperature (d) the amount of yeast
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.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
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? What do we do with “the amount of yeast”? (a) we change it (b) we measure it (c) we keep it the same
35. 35.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a mirror (c) dry yeast (d) sugar
36. 36.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) warm water (c) a comb (d) a mirror
37. 37.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
38. 38.True or false: turmeric powder is needed for the yeast balloon. (a) True (b) False
39. 39.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
40. 40.🔍 Which is the odd one out? (a) time (b) sunlight (c) sugar (d) warm water

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