Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 783 · 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.🔍 Which is the odd one out? (a) vinegar (b) sugar (c) salt (d) a magnet
2. 2.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
3. 3.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) keep it for a month (c) throw it at a wall (d) put it in your mouth
4. 4.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a paper clip (c) a battery cell (d) sugar
5. 5.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) sugar (d) a mirror
6. 6.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) warm water (c) sugar (d) a mirror
7. 7.⚖️ 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
8. 8.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
9. 9.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
10. 10.🍞 Which of these is something yeast does not need? (a) vinegar (b) warm water (c) sugar (d) time
11. 11.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is kept the same. (a) True (b) False
12. 12.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) the balloon is bigger (c) it shrinks to nothing (d) it turns to bread
13. 13.🍞 Which of these is something yeast needs? (a) a magnet (b) warm water (c) vinegar (d) sunlight
14. 14.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
15. 15.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it turns to sugar (c) it grows faster (d) it glows
16. 16.🍞 Which of these is something yeast does not need? (a) sugar (b) sunlight (c) time (d) warm water
17. 17.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
18. 18.🍞 Why do we add sugar to the yeast? (a) to colour it (b) it is food for yeast (c) to make it heavy (d) to make it sweet
19. 19.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it bursts at once (c) it turns yellow (d) it grows much faster
20. 20.🧺 Which of these is not needed for the yeast balloon? (a) turmeric powder (b) warm water (c) sugar (d) a balloon
21. 21.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) warm, not hot (d) very salty
22. 22.⚖️ 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
23. 23.True or false: salt is something yeast does not need. (a) True (b) False
24. 24.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
25. 25.🍞 Which of these is something yeast needs? (a) sugar (b) salt (c) sunlight (d) a magnet
26. 26.True or false: a comb is not needed for the yeast balloon. (a) False (b) True
27. 27.🧺 Which of these is needed for the yeast balloon? (a) a balloon (b) turmeric powder (c) a mirror (d) a magnet
28. 28.⚖️ 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 measure it (b) we change it (c) we keep it the same
29. 29.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to wash dishes (c) to clean floors (d) to colour rice
30. 30.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
31. 31.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) size of the balloon (b) the amount of sugar (c) the amount of yeast (d) the water temperature
32. 32.⚖️ 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 change it (b) we keep it the same (c) we measure it
33. 33.📘 What is yeast? (a) a kind of salt (b) a kind of sugar (c) a tiny living fungus (d) a kind of stone
34. 34.🔍 Which is the odd one out? (a) sugar (b) salt (c) time (d) warm water
35. 35.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) a balloon (d) a magnet
36. 36.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the amount of water (b) size of the balloon (c) the water temperature
37. 37.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is kept the same. (a) True (b) False
38. 38.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
39. 39.⚖️ 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) True (b) False
40. 40.True or false: a paper clip is needed for the yeast balloon. (a) False (b) True

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