Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 854 · 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 does yeast work slowly in cold water? (a) cold makes it pink (b) cold kills sugar (c) cold slows yeast down (d) cold water is heavy
2. 2.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) dry yeast (c) a battery cell (d) warm water
3. 3.⚖️ 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 keep it the same (b) we change it (c) we measure it
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 needed for the yeast balloon? (a) warm water (b) a mirror (c) a battery cell (d) a magnet
6. 6.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
7. 7.⚖️ 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 water (c) the same bottles (d) the water temperature
8. 8.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) dry yeast (c) a mirror (d) a comb
9. 9.🔍 Which is the odd one out? (a) salt (b) sunlight (c) a magnet (d) sugar
10. 10.⚖️ 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 sugar (c) size of the balloon
11. 11.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it bursts at once (c) it turns yellow (d) it grows very little
12. 12.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) turmeric powder (c) a comb (d) sugar
13. 13.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
14. 14.🔍 Which is the odd one out? (a) warm water (b) time (c) sugar (d) salt
15. 15.⚖️ 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 sugar (b) size of the balloon (c) the amount of yeast (d) the water temperature
16. 16.📘 What is yeast? (a) a kind of sugar (b) a kind of salt (c) a kind of stone (d) a tiny living fungus
17. 17.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) sunlight (d) warm water
18. 18.🛟 The water for the yeast should be ___. (a) very salty (b) warm, not hot (c) boiling hot (d) ice cold
19. 19.True or false: a paper clip is needed for the yeast balloon. (a) True (b) False
20. 20.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) turmeric powder (b) dry yeast (c) warm water (d) a balloon
21. 21.🔮 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
22. 22.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
23. 23.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is what we measure. (a) False (b) True
24. 24.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
25. 25.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
26. 26.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it heavy (c) to make it sweet (d) it is food for yeast
27. 27.🔍 Which is the odd one out? (a) time (b) salt (c) sunlight (d) a magnet
28. 28.True or false: a magnet is needed for the yeast balloon. (a) False (b) True
29. 29.True or false: sugar is something yeast does not need. (a) False (b) True
30. 30.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a battery cell (b) dry yeast (c) a small bottle (d) warm water
31. 31.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) a comb (c) sugar (d) warm water
32. 32.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) carbon dioxide gas (c) steam (d) smoke
33. 33.True or false: a mirror is not needed for the yeast balloon. (a) False (b) True
34. 34.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
35. 35.True or false: warm water is something yeast needs. (a) False (b) True
36. 36.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) it turns to bread (c) it shrinks to nothing (d) the balloon is bigger
37. 37.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) warm water (c) a magnet (d) dry yeast
38. 38.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is kept the same. (a) False (b) True
39. 39.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is kept the same. (a) False (b) True
40. 40.⚖️ 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) True (b) False

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