Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 702 · 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.🧺 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
2. 2.🛟 The water for the yeast should be ___. (a) ice cold (b) very salty (c) warm, not hot (d) boiling hot
3. 3.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) smoke (c) carbon dioxide gas (d) steam
4. 4.📘 What is yeast? (a) a kind of salt (b) a kind of stone (c) a kind of sugar (d) a tiny living fungus
5. 5.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is what we measure. (a) False (b) True
6. 6.🔍 Which is the odd one out? (a) sugar (b) salt (c) warm water (d) time
7. 7.🍞 Which of these is something yeast needs? (a) salt (b) vinegar (c) a magnet (d) warm water
8. 8.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a magnet (c) dry yeast (d) a small bottle
9. 9.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a battery cell (c) a small bottle (d) a balloon
10. 10.True or false: time is something yeast does not need. (a) False (b) True
11. 11.⚖️ 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
12. 12.🛟 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
13. 13.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) size of the balloon (b) the amount of sugar (c) the amount of water (d) the same bottles
14. 14.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
15. 15.⚖️ 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) the water temperature (c) size of the balloon
16. 16.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is bigger (c) it shrinks to nothing (d) the balloon is smaller
17. 17.🔍 Which is the odd one out? (a) sugar (b) time (c) sunlight (d) warm water
18. 18.🍞 Which of these is something yeast does not need? (a) time (b) salt (c) sugar (d) warm water
19. 19.🍞 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
20. 20.🍞 Which of these is something yeast does not need? (a) time (b) vinegar (c) sugar (d) warm water
21. 21.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
22. 22.True or false: salt is something yeast does not need. (a) False (b) True
23. 23.True or false: warm water is something yeast needs. (a) False (b) True
24. 24.⚖️ 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) size of the balloon (c) the same bottles (d) the water temperature
25. 25.🔮 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
26. 26.🍞 Which of these is something yeast does not need? (a) time (b) a magnet (c) warm water (d) sugar
27. 27.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) sugar (c) a balloon (d) a small bottle
28. 28.True or false: a paper clip is needed for the yeast balloon. (a) False (b) True
29. 29.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a balloon (c) a comb (d) dry yeast
30. 30.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
31. 31.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
32. 32.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a battery cell (c) turmeric powder (d) dry yeast
33. 33.🍞 Which of these is something yeast needs? (a) sugar (b) a magnet (c) salt (d) sunlight
34. 34.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a comb (c) a magnet (d) sugar
35. 35.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a mirror (c) dry yeast (d) warm water
36. 36.🔍 Which is the odd one out? (a) vinegar (b) time (c) sunlight (d) a magnet
37. 37.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a small bottle (c) a paper clip (d) warm water
38. 38.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
39. 39.True or false: a mirror is not needed for the yeast balloon. (a) True (b) False
40. 40.True or false: warm water is needed for the yeast balloon. (a) True (b) False

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