Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 261 · 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.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
2. 2.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) salt (d) warm water
3. 3.📘 What is yeast? (a) a kind of sugar (b) a kind of stone (c) a tiny living fungus (d) a kind of salt
4. 4.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
5. 5.True or false: vinegar is something yeast needs. (a) True (b) False
6. 6.🛟 The water for the yeast should be ___. (a) very salty (b) warm, not hot (c) boiling hot (d) ice cold
7. 7.True or false: a comb is needed for the yeast balloon. (a) False (b) True
8. 8.True or false: a paper clip is needed for the yeast balloon. (a) False (b) True
9. 9.True or false: a battery cell is needed for the yeast balloon. (a) False (b) True
10. 10.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to colour it (c) to make it heavy (d) to make it sweet
11. 11.🔍 Which is the odd one out? (a) a magnet (b) salt (c) time (d) sunlight
12. 12.⚖️ 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
13. 13.⚖️ 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 amount of sugar
14. 14.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) warm water (c) a mirror (d) a balloon
15. 15.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) pour it down the sink (c) put it in your mouth (d) keep it for a month
16. 16.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a comb (c) a balloon (d) a magnet
17. 17.🔍 Which is the odd one out? (a) vinegar (b) sugar (c) warm water (d) time
18. 18.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
19. 19.🔮 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
20. 20.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a paper clip (c) sugar (d) a balloon
21. 21.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
22. 22.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it glows (c) it turns to sugar (d) it grows faster
23. 23.🧺 Which of these is not needed for the yeast balloon? (a) a magnet (b) sugar (c) a balloon (d) dry yeast
24. 24.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
25. 25.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
26. 26.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) dry yeast (c) a small bottle (d) a balloon
27. 27.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
28. 28.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
29. 29.⚖️ 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
30. 30.⚖️ 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 measure it (b) we change it (c) we keep it the same
31. 31.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
32. 32.⚖️ 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) True (b) False
33. 33.🔍 Which is the odd one out? (a) warm water (b) sugar (c) time (d) salt
34. 34.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
35. 35.🍞 Which of these is something yeast needs? (a) sunlight (b) vinegar (c) time (d) a magnet
36. 36.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the water temperature (b) the amount of sugar (c) the amount of yeast (d) size of the balloon
37. 37.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) it shrinks to nothing (c) the balloon is bigger (d) it turns to bread
38. 38.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
39. 39.⚖️ 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 change it (b) we keep it the same (c) we measure it
40. 40.⚖️ 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 amount of water

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