Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 257 · 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 does not need? (a) salt (b) time (c) warm water (d) sugar
2. 2.True or false: a small bottle is not needed for the yeast balloon. (a) False (b) True
3. 3.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a paper clip (c) a small bottle (d) a mirror
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) a magnet (d) a small bottle
5. 5.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold slows yeast down (c) cold makes it pink (d) cold water is heavy
6. 6.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
7. 7.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a battery cell (c) dry yeast (d) a small bottle
8. 8.True or false: sugar is needed for the yeast balloon. (a) False (b) True
9. 9.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
10. 10.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
11. 11.🛟 The water for the yeast should be ___. (a) very salty (b) warm, not hot (c) ice cold (d) boiling hot
12. 12.🔍 Which is the odd one out? (a) sugar (b) time (c) warm water (d) a magnet
13. 13.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) a small bottle (c) a balloon (d) sugar
14. 14.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
15. 15.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
16. 16.🍞 Which of these is something yeast needs? (a) a magnet (b) salt (c) sugar (d) vinegar
17. 17.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
18. 18.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
19. 19.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) throw it at a wall (c) put it in your mouth (d) pour it down the sink
20. 20.🍞 Which of these is something yeast needs? (a) time (b) salt (c) sunlight (d) a magnet
21. 21.⚖️ 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
22. 22.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the amount of water (b) size of the balloon (c) the water temperature
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 sugar (b) the water temperature (c) size of the balloon (d) the same bottles
24. 24.True or false: a small bottle is needed for the yeast balloon. (a) False (b) True
25. 25.True or false: warm water is something yeast needs. (a) False (b) True
26. 26.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is smaller (c) it turns to bread (d) the balloon is bigger
27. 27.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) carbon dioxide gas (c) air from outside (d) steam
28. 28.True or false: vinegar is something yeast does not need. (a) True (b) False
29. 29.⚖️ 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 change it (c) we measure it
30. 30.🍞 Which of these is something yeast needs? (a) salt (b) a magnet (c) vinegar (d) warm water
31. 31.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
32. 32.⚖️ 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) True (b) False
33. 33.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to make it sweet (c) to colour it (d) it is food for yeast
34. 34.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it glows (c) it turns to sugar (d) it grows faster
35. 35.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
36. 36.🔍 Which is the odd one out? (a) time (b) sugar (c) warm water (d) salt
37. 37.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to clean floors (c) to colour rice (d) to make bread rise
38. 38.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
39. 39.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) time (d) a magnet
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 measure it (b) we change it (c) we keep it the same

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