Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 222 · 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) a magnet (b) sugar (c) a small bottle (d) a balloon
2. 2.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is the one thing we change. (a) False (b) True
3. 3.⚖️ 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) False (b) True
4. 4.🔍 Which is the odd one out? (a) warm water (b) time (c) sugar (d) vinegar
5. 5.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
6. 6.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a comb (c) warm water (d) a small bottle
7. 7.🧺 Which of these is not needed for the yeast balloon? (a) a magnet (b) a balloon (c) sugar (d) dry yeast
8. 8.⚖️ 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 measure it (b) we change it (c) we keep it the same
9. 9.🔍 Which is the odd one out? (a) sunlight (b) a magnet (c) vinegar (d) warm water
10. 10.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a battery cell (b) a balloon (c) dry yeast (d) a small bottle
11. 11.🛟 The water for the yeast should be ___. (a) ice cold (b) warm, not hot (c) boiling hot (d) very salty
12. 12.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold slows yeast down (c) cold water is heavy (d) cold makes it pink
13. 13.True or false: a battery cell is not needed for the yeast balloon. (a) False (b) True
14. 14.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
15. 15.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
16. 16.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is the one thing we change. (a) True (b) False
17. 17.🔍 Which is the odd one out? (a) warm water (b) sugar (c) a magnet (d) time
18. 18.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
19. 19.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows much faster (c) it bursts at once (d) it grows very little
20. 20.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to colour it (c) to make it heavy (d) it is food for yeast
21. 21.True or false: a magnet is something yeast needs. (a) False (b) True
22. 22.🔍 Which is the odd one out? (a) sunlight (b) vinegar (c) sugar (d) salt
23. 23.True or false: vinegar 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 kept the same? (a) size of the balloon (b) the amount of yeast (c) the water temperature
25. 25.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
26. 26.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the water temperature”? (a) we measure it (b) we keep it the same (c) we change it
27. 27.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
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 amount of yeast (b) the amount of sugar (c) the water temperature (d) the same bottles
29. 29.True or false: a mirror is not needed for the yeast balloon. (a) False (b) True
30. 30.🍞 Which of these is something yeast needs? (a) warm water (b) vinegar (c) sunlight (d) salt
31. 31.True or false: sugar is something yeast needs. (a) False (b) True
32. 32.True or false: turmeric powder is needed for the yeast balloon. (a) True (b) False
33. 33.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) pour it down the sink (c) throw it at a wall (d) keep it for a month
34. 34.True or false: a balloon is not needed for the yeast balloon. (a) False (b) True
35. 35.⚖️ 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
36. 36.⚖️ 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 change it (c) we measure it
37. 37.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) dry yeast (c) a comb (d) a paper clip
38. 38.True or false: a paper clip is not needed for the yeast balloon. (a) False (b) True
39. 39.📘 What is yeast? (a) a kind of salt (b) a kind of sugar (c) a tiny living fungus (d) a kind of stone
40. 40.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed

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