Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 216 · 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 sugar (b) a tiny living fungus (c) a kind of salt (d) a kind of stone
2. 2.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
3. 3.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows much faster (c) it turns yellow (d) it grows very little
4. 4.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) throw it at a wall (c) pour it down the sink (d) put it in your mouth
5. 5.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
6. 6.🍞 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
7. 7.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
8. 8.⚖️ 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) size of the balloon (c) the water temperature (d) the same bottles
9. 9.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a mirror (d) a small bottle
10. 10.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) dry yeast (d) turmeric powder
11. 11.True or false: time is something yeast needs. (a) True (b) False
12. 12.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
13. 13.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) warm water (c) a magnet (d) a balloon
14. 14.🍞 Which of these is something yeast does not need? (a) salt (b) warm water (c) time (d) sugar
15. 15.🛟 The water for the yeast should be ___. (a) very salty (b) boiling hot (c) ice cold (d) warm, not hot
16. 16.True or false: warm water is something yeast needs. (a) True (b) False
17. 17.🍞 Which of these is something yeast needs? (a) sunlight (b) a magnet (c) sugar (d) vinegar
18. 18.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a magnet (c) a paper clip (d) a small bottle
19. 19.🔍 Which is the odd one out? (a) warm water (b) time (c) salt (d) sugar
20. 20.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) the yeast is killed (c) it glows (d) it turns to sugar
21. 21.🔍 Which is the odd one out? (a) vinegar (b) salt (c) sugar (d) sunlight
22. 22.🔍 Which is the odd one out? (a) vinegar (b) salt (c) sunlight (d) warm water
23. 23.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) it shrinks to nothing (c) the balloon is smaller (d) the balloon is bigger
24. 24.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is the one thing we change. (a) True (b) False
25. 25.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) dry yeast (c) a paper clip (d) sugar
26. 26.⚖️ 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) False (b) True
27. 27.🍞 Which of these is something yeast needs? (a) warm water (b) vinegar (c) a magnet (d) sunlight
28. 28.True or false: a paper clip is needed for the yeast balloon. (a) True (b) False
29. 29.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
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 kept the same. (a) False (b) True
31. 31.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
32. 32.True or false: salt is something yeast does not need. (a) False (b) True
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 water temperature (b) the same bottles (c) the amount of yeast (d) the amount of sugar
34. 34.True or false: warm water is needed for the yeast balloon. (a) False (b) True
35. 35.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
36. 36.🍞 Which of these is something yeast needs? (a) sunlight (b) time (c) vinegar (d) a magnet
37. 37.🔍 Which is the odd one out? (a) sugar (b) a magnet (c) warm water (d) time
38. 38.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) a magnet (d) sugar
39. 39.🔍 Which is the odd one out? (a) time (b) sunlight (c) warm water (d) sugar
40. 40.🔍 Which is the odd one out? (a) warm water (b) vinegar (c) sugar (d) time

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