Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 831 · 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 salt (b) a kind of sugar (c) a kind of stone (d) a tiny living fungus
2. 2.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) air from outside (c) smoke (d) carbon dioxide gas
3. 3.True or false: sugar is something yeast does not need. (a) True (b) False
4. 4.🔍 Which is the odd one out? (a) a magnet (b) salt (c) sugar (d) sunlight
5. 5.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a balloon (c) warm water (d) a paper clip
6. 6.True or false: salt is something yeast needs. (a) False (b) True
7. 7.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) time (d) vinegar
8. 8.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a small bottle (c) warm water (d) a mirror
9. 9.🍞 Does yeast need vinegar 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) throw it at a wall (b) keep it for a month (c) pour it down the sink (d) put it in your mouth
11. 11.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
12. 12.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a magnet (c) warm water (d) a small bottle
13. 13.True or false: a mirror is not needed for the yeast balloon. (a) False (b) True
14. 14.🍞 Which of these is something yeast needs? (a) a magnet (b) warm water (c) vinegar (d) salt
15. 15.⚖️ 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) False (b) True
16. 16.⚖️ 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 water (b) the amount of yeast (c) the same bottles (d) the water temperature
17. 17.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a mirror (c) a small bottle (d) a balloon
18. 18.🔍 Which is the odd one out? (a) warm water (b) salt (c) a magnet (d) sunlight
19. 19.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) warm water (c) turmeric powder (d) dry yeast
20. 20.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
21. 21.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
22. 22.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to make bread rise (c) to wash dishes (d) to colour rice
23. 23.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
24. 24.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it sweet (c) it is food for yeast (d) to make it heavy
25. 25.True or false: a magnet is something yeast does not need. (a) True (b) False
26. 26.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a balloon (c) a mirror (d) a battery cell
27. 27.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
28. 28.True or false: warm water is something yeast does not need. (a) False (b) True
29. 29.🍞 Which of these is something yeast does not need? (a) salt (b) time (c) sugar (d) warm water
30. 30.⚖️ 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 change it (b) we keep it the same (c) we measure it
31. 31.⚖️ 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 water (b) the water temperature (c) the amount of sugar (d) size of the balloon
32. 32.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it turns to sugar (c) the yeast is killed (d) it glows
33. 33.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is what we measure. (a) True (b) False
34. 34.True or false: sugar is needed for the yeast balloon. (a) False (b) True
35. 35.🍞 Which of these is something yeast needs? (a) a magnet (b) salt (c) time (d) sunlight
36. 36.True or false: sunlight is something yeast does not need. (a) True (b) False
37. 37.⚖️ 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 measure it (b) we keep it the same (c) we change it
38. 38.🛟 The water for the yeast should be ___. (a) ice cold (b) very salty (c) warm, not hot (d) boiling hot
39. 39.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) sugar (d) a magnet
40. 40.True or false: sugar is something yeast needs. (a) True (b) False

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