Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 891 · 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 needed for the yeast balloon? (a) a mirror (b) a balloon (c) turmeric powder (d) a magnet
2. 2.🔍 Which is the odd one out? (a) warm water (b) a magnet (c) vinegar (d) sunlight
3. 3.🛟 The water for the yeast should be ___. (a) warm, not hot (b) very salty (c) boiling hot (d) ice cold
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 same bottles
5. 5.🍞 Which of these is something yeast does not need? (a) a magnet (b) warm water (c) time (d) sugar
6. 6.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
7. 7.🍞 Which of these is something yeast needs? (a) vinegar (b) salt (c) sunlight (d) warm water
8. 8.🍞 Why do we add sugar to the yeast? (a) to colour it (b) it is food for yeast (c) to make it sweet (d) to make it heavy
9. 9.⚖️ 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 water (b) the amount of yeast (c) the amount of sugar (d) size of the balloon
10. 10.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it turns yellow (c) it grows very little (d) it bursts at once
11. 11.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a paper clip (c) a battery cell (d) dry yeast
12. 12.⚖️ 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) True (b) False
13. 13.🔮 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
14. 14.True or false: vinegar is something yeast needs. (a) False (b) True
15. 15.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
16. 16.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) steam (c) smoke (d) carbon dioxide gas
17. 17.True or false: time is something yeast needs. (a) False (b) True
18. 18.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
19. 19.True or false: salt is something yeast does not need. (a) False (b) True
20. 20.True or false: a mirror is needed for the yeast balloon. (a) True (b) False
21. 21.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is what we measure. (a) True (b) False
22. 22.⚖️ 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
23. 23.⚖️ 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
24. 24.True or false: sugar is something yeast does not need. (a) False (b) True
25. 25.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
26. 26.True or false: dry yeast is needed for the yeast balloon. (a) False (b) True
27. 27.📘 What is yeast? (a) a kind of sugar (b) a kind of salt (c) a kind of stone (d) a tiny living fungus
28. 28.🧺 Which of these is needed for the yeast balloon? (a) sugar (b) a paper clip (c) a comb (d) turmeric powder
29. 29.⚖️ 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 amount of sugar (c) the water temperature
30. 30.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold slows yeast down (c) cold water is heavy (d) cold kills sugar
31. 31.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is the one thing we change. (a) False (b) True
32. 32.🔍 Which is the odd one out? (a) sugar (b) salt (c) vinegar (d) a magnet
33. 33.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) sugar (c) turmeric powder (d) a balloon
34. 34.🔍 Which is the odd one out? (a) warm water (b) sunlight (c) time (d) sugar
35. 35.🍞 Which of these is something yeast does not need? (a) salt (b) sugar (c) time (d) warm water
36. 36.⚖️ 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) the amount of yeast (d) the same bottles
37. 37.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) put it in your mouth (c) keep it for a month (d) pour it down the sink
38. 38.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) a paper clip (d) a small bottle
39. 39.True or false: a magnet is needed for the yeast balloon. (a) False (b) True
40. 40.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to make bread rise (c) to clean floors (d) to wash dishes

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