Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 734 · 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? True or false: the amount of yeast is kept the same. (a) True (b) False
2. 2.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a magnet (c) a balloon (d) dry yeast
3. 3.🍞 Which of these is something yeast needs? (a) time (b) a magnet (c) sunlight (d) salt
4. 4.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it bursts at once (c) it grows much faster (d) it grows very little
5. 5.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) air from outside (c) steam (d) smoke
6. 6.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) sugar (d) vinegar
7. 7.⚖️ 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
8. 8.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
9. 9.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
10. 10.⚖️ 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 amount of water (c) size of the balloon (d) the amount of sugar
11. 11.True or false: warm water is something yeast does not need. (a) False (b) True
12. 12.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) time (d) sunlight
13. 13.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
14. 14.⚖️ 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
15. 15.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is bigger (c) it turns to bread (d) the balloon is smaller
16. 16.True or false: vinegar is something yeast needs. (a) False (b) True
17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) a battery cell (d) a balloon
18. 18.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a small bottle (d) a comb
19. 19.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) turmeric powder (c) warm water (d) a balloon
20. 20.⚖️ 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) the amount of yeast (c) size of the balloon
21. 21.🔍 Which is the odd one out? (a) sunlight (b) sugar (c) vinegar (d) salt
22. 22.True or false: warm water is needed for the yeast balloon. (a) False (b) True
23. 23.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) keep it for a month (c) throw it at a wall (d) put it in your mouth
24. 24.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
25. 25.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to clean floors (c) to colour rice (d) to make bread rise
26. 26.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
27. 27.True or false: time is something yeast needs. (a) True (b) False
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) dry yeast (c) a mirror (d) sugar
29. 29.True or false: salt is something yeast does not need. (a) False (b) True
30. 30.⚖️ 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
31. 31.📘 What is yeast? (a) a tiny living fungus (b) a kind of sugar (c) a kind of salt (d) a kind of stone
32. 32.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is what we measure. (a) True (b) False
33. 33.⚖️ 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 yeast (b) the water temperature (c) size of the balloon (d) the amount of water
34. 34.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) a paper clip (d) sugar
35. 35.🍞 Which of these is something yeast needs? (a) sunlight (b) warm water (c) vinegar (d) a magnet
36. 36.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a magnet (c) warm water (d) dry yeast
37. 37.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
38. 38.⚖️ 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
39. 39.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a paper clip (c) a small bottle (d) turmeric powder
40. 40.🍞 Which of these is something yeast needs? (a) a magnet (b) vinegar (c) sugar (d) sunlight

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