Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 603 · 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.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold kills sugar (c) cold slows yeast down (d) cold makes it pink
2. 2.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it turns to sugar (c) the yeast is killed (d) it glows
3. 3.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
4. 4.True or false: turmeric powder is needed for the yeast balloon. (a) False (b) True
5. 5.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
6. 6.⚖️ 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 keep it the same (b) we change it (c) we measure it
7. 7.⚖️ 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) False (b) True
8. 8.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) a battery cell (d) sugar
9. 9.True or false: warm water is something yeast does not need. (a) True (b) False
10. 10.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
11. 11.True or false: sunlight is something yeast does not need. (a) True (b) False
12. 12.🔍 Which is the odd one out? (a) sugar (b) warm water (c) time (d) vinegar
13. 13.🔍 Which is the odd one out? (a) time (b) a magnet (c) warm water (d) sugar
14. 14.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) keep it for a month (c) throw it at a wall (d) pour it down the sink
15. 15.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a small bottle (c) dry yeast (d) a paper clip
16. 16.🛟 The water for the yeast should be ___. (a) boiling hot (b) very salty (c) ice cold (d) warm, not hot
17. 17.⚖️ 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) the amount of sugar (c) the amount of yeast (d) the water temperature
18. 18.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
19. 19.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
20. 20.True or false: vinegar is something yeast does not need. (a) False (b) True
21. 21.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a small bottle (c) a magnet (d) dry yeast
22. 22.True or false: a mirror is not needed for the yeast balloon. (a) False (b) True
23. 23.⚖️ 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
24. 24.🍞 Which of these is something yeast does not need? (a) time (b) salt (c) sugar (d) warm water
25. 25.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
26. 26.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “size of the balloon”? (a) we measure it (b) we keep it the same (c) we change it
27. 27.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a balloon (c) a small bottle (d) turmeric powder
28. 28.🔍 Which is the odd one out? (a) vinegar (b) salt (c) a magnet (d) sugar
29. 29.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
30. 30.True or false: salt is something yeast does not need. (a) False (b) True
31. 31.True or false: sunlight is something yeast needs. (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 amount of sugar is kept the same. (a) False (b) True
33. 33.⚖️ 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 water temperature (c) the same bottles
34. 34.⚖️ 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 change it (c) we keep it the same
35. 35.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
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 sugar”? (a) we keep it the same (b) we change it (c) we measure it
37. 37.🍞 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
38. 38.📘 What is yeast? (a) a kind of salt (b) a kind of stone (c) a kind of sugar (d) a tiny living fungus
39. 39.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) turmeric powder (c) a small bottle (d) a magnet
40. 40.True or false: a paper clip is needed for the yeast balloon. (a) False (b) True

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