Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 997 · 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.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) put it in your mouth (c) throw it at a wall (d) pour it down the sink
2. 2.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) warm water (d) vinegar
3. 3.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) a balloon (c) a comb (d) warm water
4. 4.⚖️ 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 keep it the same (b) we measure it (c) we change it
5. 5.⚖️ 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
6. 6.🍞 Which of these is something yeast needs? (a) salt (b) vinegar (c) a magnet (d) time
7. 7.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold kills sugar (c) cold water is heavy (d) cold slows yeast down
8. 8.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is the one thing we change. (a) True (b) False
9. 9.🔍 Which is the odd one out? (a) sugar (b) sunlight (c) time (d) warm water
10. 10.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
11. 11.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a paper clip (d) warm water
12. 12.⚖️ 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) size of the balloon (c) the same bottles (d) the water temperature
13. 13.🛟 The water for the yeast should be ___. (a) warm, not hot (b) ice cold (c) very salty (d) boiling hot
14. 14.⚖️ 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 change it (b) we keep it the same (c) we measure it
15. 15.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it bursts at once (c) it grows much faster (d) it grows very little
16. 16.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is smaller (c) it turns to bread (d) the balloon is bigger
17. 17.True or false: a comb is needed for the yeast balloon. (a) True (b) False
18. 18.📘 What is yeast? (a) a kind of salt (b) a kind of stone (c) a kind of sugar (d) a tiny living fungus
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.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a balloon (c) warm water (d) a mirror
21. 21.🔍 Which is the odd one out? (a) warm water (b) time (c) sugar (d) salt
22. 22.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
23. 23.True or false: vinegar is something yeast needs. (a) True (b) False
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 water temperature (c) the amount of sugar
25. 25.🍞 Which of these is something yeast needs? (a) a magnet (b) sunlight (c) sugar (d) salt
26. 26.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) warm water (d) salt
27. 27.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) a comb (d) a balloon
28. 28.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
29. 29.⚖️ 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 amount of water (d) the water temperature
30. 30.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) a battery cell (d) a small bottle
31. 31.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
32. 32.🧺 Which of these is needed for the yeast balloon? (a) dry yeast (b) a battery cell (c) a comb (d) a mirror
33. 33.🔍 Which is the odd one out? (a) sugar (b) vinegar (c) warm water (d) time
34. 34.True or false: time is something yeast needs. (a) False (b) True
35. 35.🔮 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
36. 36.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
37. 37.True or false: vinegar is something yeast does not need. (a) False (b) True
38. 38.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
39. 39.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) turmeric powder (c) sugar (d) dry yeast
40. 40.🔍 Which is the odd one out? (a) vinegar (b) time (c) a magnet (d) salt

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