Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 663 · 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.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) pour it down the sink (c) keep it for a month (d) put it in your mouth
2. 2.⚖️ 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
3. 3.True or false: vinegar is something yeast needs. (a) True (b) False
4. 4.⚖️ 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 amount of water
5. 5.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold makes it pink (c) cold water is heavy (d) cold slows yeast down
6. 6.🔍 Which is the odd one out? (a) vinegar (b) sugar (c) warm water (d) time
7. 7.True or false: a mirror is needed for the yeast balloon. (a) True (b) False
8. 8.⚖️ 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) False (b) True
9. 9.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) it turns to bread (c) the balloon is bigger (d) it shrinks to nothing
10. 10.True or false: warm water is something yeast does not need. (a) True (b) False
11. 11.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) turmeric powder (c) a comb (d) a balloon
12. 12.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a battery cell (c) warm water (d) a comb
13. 13.📘 What is yeast? (a) a kind of sugar (b) a tiny living fungus (c) a kind of salt (d) a kind of stone
14. 14.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a small bottle (c) a magnet (d) sugar
15. 15.True or false: a comb is not needed for the yeast balloon. (a) True (b) False
16. 16.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
17. 17.True or false: salt is something yeast does not need. (a) True (b) False
18. 18.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a small bottle (c) dry yeast (d) a mirror
19. 19.🍞 Which of these is something yeast needs? (a) salt (b) a magnet (c) vinegar (d) time
20. 20.⚖️ 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 same bottles (c) the water temperature
21. 21.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) sugar (d) vinegar
22. 22.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) warm water (c) turmeric powder (d) a small bottle
23. 23.True or false: salt is something yeast needs. (a) True (b) False
24. 24.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is kept the same. (a) True (b) False
25. 25.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) salt (d) sugar
26. 26.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) carbon dioxide gas (c) smoke (d) air from outside
27. 27.True or false: turmeric powder is needed for the yeast balloon. (a) True (b) False
28. 28.🛟 The water for the yeast should be ___. (a) ice cold (b) very salty (c) boiling hot (d) warm, not hot
29. 29.🔍 Which is the odd one out? (a) sugar (b) warm water (c) time (d) salt
30. 30.🍞 Which of these is something yeast does not need? (a) time (b) a magnet (c) warm water (d) sugar
31. 31.🧺 Do we need a magnet 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: the amount of yeast is kept the same. (a) True (b) False
33. 33.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
34. 34.True or false: sunlight is something yeast does not need. (a) True (b) False
35. 35.True or false: a balloon is needed for the yeast balloon. (a) False (b) True
36. 36.🔍 Which is the odd one out? (a) sugar (b) salt (c) vinegar (d) a magnet
37. 37.True or false: sugar is something yeast needs. (a) False (b) True
38. 38.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a balloon (c) a mirror (d) dry yeast
39. 39.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
40. 40.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed

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