Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 407 · 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.📘 What is yeast? (a) a kind of stone (b) a tiny living fungus (c) a kind of sugar (d) a kind of salt
2. 2.🍞 Which of these is something yeast does not need? (a) warm water (b) salt (c) time (d) sugar
3. 3.🛟 The water for the yeast should be ___. (a) warm, not hot (b) very salty (c) boiling hot (d) ice cold
4. 4.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
5. 5.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
6. 6.🔍 Which is the odd one out? (a) sunlight (b) sugar (c) vinegar (d) salt
7. 7.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
8. 8.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is kept the same. (a) False (b) True
9. 9.True or false: sunlight is something yeast does not need. (a) True (b) False
10. 10.True or false: salt is something yeast needs. (a) True (b) False
11. 11.True or false: vinegar is something yeast needs. (a) True (b) False
12. 12.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) the balloon is smaller (c) it turns to bread (d) it shrinks to nothing
13. 13.🔍 Which is the odd one out? (a) salt (b) warm water (c) time (d) sugar
14. 14.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) put it in your mouth (c) throw it at a wall (d) pour it down the sink
15. 15.🔍 Which is the odd one out? (a) sunlight (b) warm water (c) sugar (d) time
16. 16.🔍 Which is the odd one out? (a) vinegar (b) salt (c) warm water (d) a magnet
17. 17.⚖️ 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) the amount of sugar (d) size of the balloon
18. 18.⚖️ 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
19. 19.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
20. 20.🧺 Do we need a balloon 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? Which of these is kept the same? (a) the water temperature (b) the same bottles (c) size of the balloon
22. 22.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to colour it (c) to make it heavy (d) it is food for yeast
23. 23.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
24. 24.🧺 Which of these is not needed for the yeast balloon? (a) a paper clip (b) dry yeast (c) a balloon (d) a small bottle
25. 25.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) sunlight (d) warm water
26. 26.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a battery cell (b) sugar (c) dry yeast (d) a balloon
27. 27.⚖️ 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) False (b) True
28. 28.🍞 Which of these is something yeast needs? (a) vinegar (b) sunlight (c) a magnet (d) warm water
29. 29.🍞 Which of these is something yeast needs? (a) sunlight (b) salt (c) vinegar (d) time
30. 30.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
31. 31.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it glows (c) it turns to sugar (d) the yeast is killed
32. 32.True or false: a battery cell is not needed for the yeast balloon. (a) False (b) True
33. 33.⚖️ 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 change it (c) we keep it the same
34. 34.True or false: warm water is something yeast does not need. (a) False (b) True
35. 35.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
36. 36.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold water is heavy (c) cold slows yeast down (d) cold kills sugar
37. 37.🍞 Which of these is something yeast does not need? (a) vinegar (b) time (c) sugar (d) warm water
38. 38.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
39. 39.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a magnet (c) a balloon (d) a mirror
40. 40.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a small bottle (c) dry yeast (d) a mirror

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