Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 385 · 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? Which of these is what we measure? (a) the amount of sugar (b) the amount of yeast (c) the same bottles (d) size of the balloon
2. 2.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the amount of yeast (b) size of the balloon (c) the water temperature
3. 3.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
4. 4.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it heavy (c) it is food for yeast (d) to make it sweet
5. 5.🛟 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
6. 6.🍞 Which of these is something yeast does not need? (a) warm water (b) salt (c) time (d) sugar
7. 7.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
8. 8.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
9. 9.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a paper clip (c) a balloon (d) a mirror
10. 10.⚖️ 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
11. 11.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
12. 12.🛟 The water for the yeast should be ___. (a) very salty (b) boiling hot (c) ice cold (d) warm, not hot
13. 13.⚖️ 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 change it (c) we measure it
14. 14.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the amount of water (b) the water temperature (c) size of the balloon
15. 15.⚖️ 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
16. 16.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
17. 17.True or false: a paper clip is not needed for the yeast balloon. (a) True (b) False
18. 18.⚖️ 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) True (b) False
19. 19.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) turmeric powder (c) a balloon (d) a small bottle
20. 20.⚖️ 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 water temperature (b) the amount of yeast (c) the same bottles (d) the amount of water
21. 21.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) a battery cell (c) turmeric powder (d) a mirror
22. 22.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
23. 23.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is bigger (c) it shrinks to nothing (d) the balloon is smaller
24. 24.⚖️ 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 measure it (b) we keep it the same (c) we change it
25. 25.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
26. 26.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
27. 27.🧺 Which of these is not needed for the yeast balloon? (a) a battery cell (b) a small bottle (c) sugar (d) a balloon
28. 28.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is kept the same. (a) False (b) True
29. 29.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) sugar (d) a mirror
30. 30.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
31. 31.True or false: warm water is needed for the yeast balloon. (a) False (b) True
32. 32.True or false: vinegar is something yeast needs. (a) True (b) False
33. 33.⚖️ 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) False (b) True
34. 34.🍞 Which of these is something yeast needs? (a) sunlight (b) a magnet (c) sugar (d) salt
35. 35.True or false: a magnet is something yeast needs. (a) False (b) True
36. 36.True or false: sugar is needed for the yeast balloon. (a) True (b) False
37. 37.True or false: turmeric powder is needed for the yeast balloon. (a) True (b) False
38. 38.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
39. 39.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
40. 40.📘 What is yeast? (a) a kind of salt (b) a kind of sugar (c) a kind of stone (d) a tiny living fungus

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