Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 176 · 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 warm water for the yeast balloon? (a) not needed (b) needed
2. 2.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
3. 3.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
4. 4.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
5. 5.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) the yeast is killed (c) it glows (d) it grows faster
6. 6.True or false: warm water is something yeast does not need. (a) True (b) False
7. 7.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) vinegar (d) warm water
8. 8.⚖️ 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 water temperature (b) the amount of sugar (c) the amount of yeast (d) the same bottles
9. 9.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it turns yellow (c) it grows much faster (d) it bursts at once
10. 10.True or false: a paper clip is needed for the yeast balloon. (a) True (b) False
11. 11.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a balloon (c) a paper clip (d) warm water
12. 12.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) sugar (c) warm water (d) dry yeast
13. 13.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a small bottle (c) a comb (d) a battery cell
14. 14.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a mirror (c) dry yeast (d) warm water
15. 15.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) turmeric powder (c) a small bottle (d) a balloon
16. 16.🧺 Which of these is not needed for the yeast balloon? (a) a magnet (b) a small bottle (c) warm water (d) sugar
17. 17.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) it is food for yeast (c) to colour it (d) to make it heavy
18. 18.True or false: time is something yeast needs. (a) False (b) True
19. 19.True or false: sugar is needed for the yeast balloon. (a) True (b) False
20. 20.🍞 Which of these is something yeast does not need? (a) time (b) a magnet (c) warm water (d) sugar
21. 21.🍞 Which of these is something yeast needs? (a) salt (b) a magnet (c) sugar (d) vinegar
22. 22.🛟 The water for the yeast should be ___. (a) warm, not hot (b) boiling hot (c) very salty (d) ice cold
23. 23.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a paper clip (c) sugar (d) turmeric powder
24. 24.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) pour it down the sink (c) keep it for a month (d) throw it at a wall
25. 25.⚖️ 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) False (b) True
26. 26.🍞 Which of these is something yeast needs? (a) salt (b) sunlight (c) warm water (d) vinegar
27. 27.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a comb (c) a balloon (d) dry yeast
28. 28.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
29. 29.True or false: a balloon is not needed for the yeast balloon. (a) False (b) True
30. 30.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
31. 31.🔍 Which is the odd one out? (a) a magnet (b) sunlight (c) vinegar (d) warm water
32. 32.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the same bottles (b) size of the balloon (c) the water temperature
33. 33.🔍 Which is the odd one out? (a) sugar (b) warm water (c) time (d) salt
34. 34.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is smaller (c) the balloon is bigger (d) it shrinks to nothing
35. 35.⚖️ 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 keep it the same (b) we change it (c) we measure it
36. 36.🔍 Which is the odd one out? (a) sugar (b) vinegar (c) time (d) warm water
37. 37.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
38. 38.⚖️ 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
39. 39.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
40. 40.🔍 Which is the odd one out? (a) sugar (b) time (c) warm water (d) sunlight

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