Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 799 · 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.🍞 Which of these is something yeast needs? (a) sugar (b) vinegar (c) salt (d) a magnet
2. 2.🛟 The water for the yeast should be ___. (a) warm, not hot (b) boiling hot (c) very salty (d) ice cold
3. 3.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) time (d) salt
4. 4.True or false: a magnet is something yeast does not need. (a) False (b) True
5. 5.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
6. 6.🍞 Which of these is something yeast does not need? (a) time (b) vinegar (c) warm water (d) sugar
7. 7.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is the one thing we change. (a) True (b) False
8. 8.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) warm water (c) dry yeast (d) a battery cell
9. 9.🔍 Which is the odd one out? (a) time (b) warm water (c) vinegar (d) sugar
10. 10.⚖️ 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
11. 11.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
12. 12.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
13. 13.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to make it heavy (c) to colour it (d) it is food for yeast
14. 14.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
15. 15.True or false: time is something yeast needs. (a) False (b) True
16. 16.⚖️ 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 measure it (b) we change it (c) we keep it the same
17. 17.⚖️ 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 sugar (b) the water temperature (c) size of the balloon (d) the same bottles
18. 18.🔍 Which is the odd one out? (a) sunlight (b) vinegar (c) salt (d) sugar
19. 19.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
20. 20.🔍 Which is the odd one out? (a) warm water (b) time (c) a magnet (d) sugar
21. 21.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) sugar (c) a comb (d) dry yeast
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? Which of these is the one thing we change? (a) the amount of water (b) the amount of sugar (c) the amount of yeast (d) the water temperature
24. 24.⚖️ 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) False (b) True
25. 25.⚖️ 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
26. 26.True or false: turmeric powder is needed for the yeast balloon. (a) False (b) True
27. 27.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) steam (c) smoke (d) air from outside
28. 28.True or false: sugar is something yeast does not need. (a) True (b) False
29. 29.🧺 Which of these is not needed for the yeast balloon? (a) a paper clip (b) sugar (c) a small bottle (d) dry yeast
30. 30.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is the one thing we change. (a) True (b) False
31. 31.⚖️ 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 measure it (b) we change it (c) we keep it the same
32. 32.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold kills sugar (c) cold makes it pink (d) cold water is heavy
33. 33.⚖️ 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
34. 34.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it bursts at once (c) it turns yellow (d) it grows much faster
35. 35.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
36. 36.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
37. 37.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
38. 38.True or false: salt is something yeast does not need. (a) False (b) True
39. 39.🍞 Which of these is something yeast needs? (a) salt (b) a magnet (c) vinegar (d) warm water
40. 40.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed

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