Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 469 · 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.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it bursts at once (c) it grows very little (d) it turns yellow
2. 2.🛟 The water for the yeast should be ___. (a) warm, not hot (b) boiling hot (c) very salty (d) ice cold
3. 3.⚖️ 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
4. 4.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
5. 5.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is kept the same. (a) True (b) False
6. 6.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
7. 7.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) sugar (c) warm water (d) a mirror
8. 8.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
9. 9.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
10. 10.⚖️ 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
11. 11.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a mirror (c) a magnet (d) dry yeast
12. 12.True or false: a comb is not needed for the yeast balloon. (a) False (b) True
13. 13.🍞 Which of these is something yeast needs? (a) salt (b) sugar (c) a magnet (d) sunlight
14. 14.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
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) True (b) False
16. 16.🔍 Which is the odd one out? (a) sugar (b) time (c) salt (d) warm water
17. 17.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) a magnet (d) sugar
18. 18.⚖️ 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 water temperature (c) the amount of sugar (d) the amount of water
19. 19.True or false: salt is something yeast needs. (a) False (b) True
20. 20.⚖️ 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
21. 21.True or false: a magnet is something yeast needs. (a) False (b) True
22. 22.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a magnet (c) sugar (d) dry yeast
23. 23.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
24. 24.True or false: a magnet is not needed for the yeast balloon. (a) False (b) True
25. 25.🍞 Which of these is something yeast needs? (a) a magnet (b) vinegar (c) warm water (d) sunlight
26. 26.🔍 Which is the odd one out? (a) a magnet (b) sugar (c) salt (d) vinegar
27. 27.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) a paper clip (c) turmeric powder (d) a magnet
28. 28.True or false: a mirror is needed for the yeast balloon. (a) True (b) False
29. 29.⚖️ 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) False (b) True
30. 30.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) size of the balloon (b) the water temperature (c) the amount of yeast
31. 31.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) air from outside (c) smoke (d) carbon dioxide gas
32. 32.True or false: warm water is something yeast needs. (a) False (b) True
33. 33.🍞 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
34. 34.True or false: dry yeast is needed for the yeast balloon. (a) False (b) True
35. 35.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a comb (c) a balloon (d) warm water
36. 36.⚖️ 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 measure it (b) we keep it the same (c) we change it
37. 37.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is what we measure. (a) True (b) False
38. 38.⚖️ 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 keep it the same (b) we measure it (c) we change it
39. 39.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) the balloon is smaller (c) it turns to bread (d) it shrinks to nothing
40. 40.📘 What is yeast? (a) a kind of sugar (b) a tiny living fungus (c) a kind of stone (d) a kind of salt

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