Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 92 · 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 tiny living fungus (b) a kind of sugar (c) a kind of salt (d) a kind of stone
2. 2.🔍 Which is the odd one out? (a) salt (b) warm water (c) sugar (d) time
3. 3.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) a balloon (c) sugar (d) warm water
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 yeast”? (a) we change it (b) we measure it (c) we keep it the same
5. 5.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the water temperature (b) the same bottles (c) size of the balloon (d) the amount of water
6. 6.True or false: a magnet is something yeast does not need. (a) True (b) False
7. 7.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) salt (d) time
8. 8.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a magnet (c) a small bottle (d) a mirror
9. 9.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it grows much faster (c) it bursts at once (d) it turns yellow
10. 10.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) sugar (c) a comb (d) a mirror
11. 11.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to wash dishes (c) to make bread rise (d) to colour rice
12. 12.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a small bottle (c) warm water (d) turmeric powder
13. 13.True or false: a magnet is something yeast needs. (a) True (b) False
14. 14.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
15. 15.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) keep it for a month (c) pour it down the sink (d) throw it at a wall
16. 16.True or false: a mirror is needed for the yeast balloon. (a) False (b) True
17. 17.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is bigger (c) the balloon is smaller (d) it turns to bread
18. 18.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
19. 19.⚖️ 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
20. 20.True or false: sunlight is something yeast needs. (a) True (b) False
21. 21.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) it is food for yeast (c) to colour it (d) to make it sweet
22. 22.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
23. 23.True or false: time is something yeast does not need. (a) True (b) False
24. 24.True or false: sugar is something yeast needs. (a) False (b) True
25. 25.🔮 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
26. 26.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) sugar (c) a magnet (d) dry yeast
27. 27.True or false: sunlight is something yeast does not need. (a) False (b) True
28. 28.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) steam (c) air from outside (d) carbon dioxide gas
29. 29.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is what we measure. (a) False (b) True
30. 30.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) warm water (c) a battery cell (d) dry yeast
31. 31.⚖️ 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
32. 32.🔍 Which is the odd one out? (a) salt (b) sugar (c) a magnet (d) vinegar
33. 33.True or false: a paper clip is not needed for the yeast balloon. (a) False (b) True
34. 34.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) warm water (c) a small bottle (d) a mirror
35. 35.🔍 Which is the odd one out? (a) sunlight (b) salt (c) vinegar (d) time
36. 36.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
37. 37.⚖️ 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
38. 38.⚖️ 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) size of the balloon (c) the same bottles
39. 39.🛟 The water for the yeast should be ___. (a) very salty (b) warm, not hot (c) boiling hot (d) ice cold
40. 40.⚖️ 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 change it (b) we keep it the same (c) we measure it

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