Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 289 · 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.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to colour it (c) it is food for yeast (d) to make it sweet
2. 2.🛟 The water for the yeast should be ___. (a) warm, not hot (b) very salty (c) boiling hot (d) ice cold
3. 3.True or false: warm water is needed for the yeast balloon. (a) False (b) True
4. 4.📘 What is yeast? (a) a tiny living fungus (b) a kind of sugar (c) a kind of salt (d) a kind of stone
5. 5.⚖️ 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 keep it the same (b) we measure it (c) we change it
6. 6.True or false: a comb is needed for the yeast balloon. (a) True (b) False
7. 7.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
8. 8.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) pour it down the sink (c) throw it at a wall (d) put it in your mouth
9. 9.True or false: vinegar is something yeast does not need. (a) False (b) True
10. 10.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) steam (c) smoke (d) carbon dioxide gas
11. 11.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it glows (c) it grows faster (d) the yeast is killed
12. 12.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold water is heavy (c) cold makes it pink (d) cold kills sugar
13. 13.🍞 Which of these is something yeast does not need? (a) warm water (b) salt (c) sugar (d) time
14. 14.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is the one thing we change. (a) True (b) False
15. 15.🍞 Which of these is something yeast needs? (a) salt (b) warm water (c) vinegar (d) a magnet
16. 16.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) a small bottle (c) a balloon (d) dry yeast
17. 17.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a small bottle (c) warm water (d) turmeric powder
18. 18.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the same bottles”? (a) we measure it (b) we change it (c) we keep it the same
19. 19.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
20. 20.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) it shrinks to nothing (c) the balloon is bigger (d) it turns to bread
21. 21.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) turmeric powder (d) warm water
22. 22.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) size of the balloon (b) the amount of sugar (c) the same bottles (d) the water temperature
23. 23.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is what we measure. (a) True (b) False
24. 24.True or false: sunlight is something yeast does not need. (a) False (b) True
25. 25.⚖️ 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 same bottles (b) size of the balloon (c) the amount of sugar (d) the water temperature
26. 26.True or false: a paper clip is needed for the yeast balloon. (a) False (b) True
27. 27.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a paper clip (c) a magnet (d) sugar
28. 28.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
29. 29.True or false: vinegar is something yeast needs. (a) True (b) False
30. 30.True or false: warm water is something yeast does not need. (a) True (b) False
31. 31.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
32. 32.⚖️ 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) True (b) False
33. 33.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
34. 34.True or false: a battery cell is not needed for the yeast balloon. (a) False (b) True
35. 35.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
36. 36.🔍 Which is the odd one out? (a) warm water (b) time (c) a magnet (d) sugar
37. 37.🍞 Which of these is something yeast needs? (a) sugar (b) sunlight (c) a magnet (d) salt
38. 38.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) warm water (c) dry yeast (d) a small bottle
39. 39.🔍 Which is the odd one out? (a) salt (b) sugar (c) warm water (d) time
40. 40.⚖️ 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 keep it the same (b) we change it (c) we measure it

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