Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 356 · 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.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
2. 2.📘 What is yeast? (a) a kind of sugar (b) a kind of salt (c) a kind of stone (d) a tiny living fungus
3. 3.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
4. 4.True or false: turmeric powder is not needed for the yeast balloon. (a) True (b) False
5. 5.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) air from outside (c) carbon dioxide gas (d) steam
6. 6.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) it shrinks to nothing (c) it turns to bread (d) the balloon is bigger
7. 7.🔍 Which is the odd one out? (a) salt (b) sunlight (c) sugar (d) vinegar
8. 8.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
9. 9.True or false: a comb is needed for the yeast balloon. (a) True (b) False
10. 10.🍞 Which of these is something yeast needs? (a) salt (b) a magnet (c) vinegar (d) sugar
11. 11.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a balloon (c) a paper clip (d) dry yeast
12. 12.🍞 Which of these is something yeast does not need? (a) warm water (b) vinegar (c) time (d) sugar
13. 13.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
14. 14.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
15. 15.🍞 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
16. 16.🍞 Why do we add sugar to the yeast? (a) to colour it (b) it is food for yeast (c) to make it heavy (d) to make it sweet
17. 17.⚖️ 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 keep it the same (b) we measure it (c) we change it
18. 18.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) a comb (d) warm water
19. 19.True or false: sunlight is something yeast needs. (a) False (b) True
20. 20.🛟 The water for the yeast should be ___. (a) ice cold (b) boiling hot (c) warm, not hot (d) very salty
21. 21.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
22. 22.🧺 Which of these is needed for the yeast balloon? (a) a small bottle (b) a magnet (c) turmeric powder (d) a comb
23. 23.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a balloon (c) a paper clip (d) dry yeast
24. 24.True or false: vinegar is something yeast does not need. (a) False (b) True
25. 25.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
26. 26.⚖️ 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) False (b) True
27. 27.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the same bottles”? (a) we measure it (b) we change it (c) we keep it the same
28. 28.⚖️ 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 water temperature (b) the amount of water (c) the same bottles (d) the amount of sugar
29. 29.True or false: time is something yeast needs. (a) True (b) False
30. 30.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is what we measure. (a) True (b) False
31. 31.⚖️ 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 yeast (b) the water temperature (c) size of the balloon (d) the amount of water
32. 32.🔍 Which is the odd one out? (a) warm water (b) time (c) sugar (d) a magnet
33. 33.True or false: a balloon is needed for the yeast balloon. (a) True (b) False
34. 34.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) sugar (c) a battery cell (d) a balloon
35. 35.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows very little (c) it bursts at once (d) it grows much faster
36. 36.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) throw it at a wall (c) pour it down the sink (d) put it in your mouth
37. 37.True or false: warm water is needed for the yeast balloon. (a) False (b) True
38. 38.⚖️ 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
39. 39.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
40. 40.True or false: sugar is something yeast does not need. (a) True (b) False

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