Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 986 · 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 sugar for the yeast balloon? (a) not needed (b) needed
2. 2.🛟 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
3. 3.⚖️ 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 keep it the same (c) we change it
4. 4.⚖️ 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
5. 5.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
6. 6.True or false: dry yeast is needed for the yeast balloon. (a) False (b) True
7. 7.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
8. 8.🔍 Which is the odd one out? (a) time (b) vinegar (c) salt (d) a magnet
9. 9.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
10. 10.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
11. 11.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a comb (c) a magnet (d) dry yeast
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 the one thing we change. (a) False (b) True
13. 13.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it grows faster (c) it turns to sugar (d) it glows
14. 14.⚖️ 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 measure it (b) we keep it the same (c) we change it
15. 15.🔍 Which is the odd one out? (a) vinegar (b) sugar (c) sunlight (d) salt
16. 16.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a magnet (c) dry yeast (d) a small bottle
17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a small bottle (c) sugar (d) a mirror
18. 18.⚖️ 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 measure it (b) we change it (c) we keep it the same
19. 19.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a small bottle (c) sugar (d) a comb
20. 20.True or false: sugar is something yeast does not need. (a) True (b) False
21. 21.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is bigger (c) the balloon is smaller (d) it shrinks to nothing
22. 22.True or false: turmeric powder is not needed for the yeast balloon. (a) True (b) False
23. 23.⚖️ 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
24. 24.⚖️ 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) True (b) False
25. 25.⚖️ 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
26. 26.🛟 The water for the yeast should be ___. (a) warm, not hot (b) boiling hot (c) ice cold (d) very salty
27. 27.True or false: a magnet is something yeast needs. (a) True (b) False
28. 28.True or false: vinegar is something yeast needs. (a) True (b) False
29. 29.🍞 Which of these is something yeast needs? (a) sugar (b) salt (c) a magnet (d) vinegar
30. 30.True or false: time is something yeast needs. (a) False (b) True
31. 31.🔍 Which is the odd one out? (a) warm water (b) time (c) sugar (d) sunlight
32. 32.🔍 Which is the odd one out? (a) sugar (b) warm water (c) salt (d) time
33. 33.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is what we measure. (a) True (b) False
34. 34.⚖️ 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 yeast (c) the amount of sugar (d) the amount of water
35. 35.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows much faster (c) it bursts at once (d) it grows very little
36. 36.True or false: time is something yeast does not need. (a) True (b) False
37. 37.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a paper clip (c) dry yeast (d) warm water
38. 38.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
39. 39.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to colour it (c) to make it sweet (d) to make it heavy
40. 40.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) a small bottle (d) a paper clip

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