Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 639 · 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: warm water is not needed for the yeast balloon. (a) True (b) False
2. 2.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) turmeric powder (c) a magnet (d) sugar
3. 3.True or false: vinegar is something yeast does not need. (a) True (b) False
4. 4.⚖️ 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 change it (b) we measure it (c) we keep it the same
5. 5.🍞 Which of these is something yeast needs? (a) a magnet (b) sunlight (c) warm water (d) salt
6. 6.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it bursts at once (c) it grows much faster (d) it turns yellow
7. 7.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) very salty (d) warm, not hot
8. 8.🍞 Which of these is something yeast needs? (a) a magnet (b) time (c) vinegar (d) salt
9. 9.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
10. 10.🛟 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
11. 11.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is kept the same. (a) True (b) False
12. 12.🍞 Which of these is something yeast does not need? (a) sugar (b) sunlight (c) time (d) warm water
13. 13.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a mirror (c) dry yeast (d) a balloon
14. 14.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) it turns to bread (c) the balloon is smaller (d) the balloon is bigger
15. 15.🔍 Which is the odd one out? (a) a magnet (b) warm water (c) sunlight (d) vinegar
16. 16.⚖️ 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 water (c) size of the balloon
17. 17.📘 What is yeast? (a) a kind of stone (b) a tiny living fungus (c) a kind of sugar (d) a kind of salt
18. 18.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) time (d) a magnet
19. 19.True or false: a comb is needed for the yeast balloon. (a) True (b) False
20. 20.True or false: a magnet is something yeast does not need. (a) True (b) False
21. 21.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a mirror (c) dry yeast (d) a small bottle
22. 22.🔍 Which is the odd one out? (a) warm water (b) time (c) vinegar (d) sugar
23. 23.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) a small bottle (d) a battery cell
24. 24.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) size of the balloon (b) the amount of sugar (c) the water temperature
25. 25.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
26. 26.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to make bread rise (c) to colour rice (d) to clean floors
27. 27.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) a small bottle (c) dry yeast (d) warm water
29. 29.True or false: a mirror is needed for the yeast balloon. (a) True (b) False
30. 30.⚖️ 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) True (b) False
31. 31.True or false: dry yeast is needed for the yeast balloon. (a) False (b) True
32. 32.🔍 Which is the odd one out? (a) a magnet (b) sugar (c) sunlight (d) salt
33. 33.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a battery cell (c) a mirror (d) a balloon
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 sugar”? (a) we measure it (b) we keep it the same (c) we change it
35. 35.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it turns to sugar (c) it grows faster (d) it glows
36. 36.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
37. 37.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
38. 38.⚖️ 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
39. 39.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
40. 40.True or false: a battery cell is not needed for the yeast balloon. (a) False (b) True

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