Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 966 · 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) sugar (b) sunlight (c) salt (d) vinegar
2. 2.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) dry yeast (d) a mirror
3. 3.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
4. 4.⚖️ 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 amount of yeast (c) the water temperature
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 sugar”? (a) we keep it the same (b) we change it (c) we measure it
6. 6.🔍 Which is the odd one out? (a) sugar (b) vinegar (c) time (d) warm water
7. 7.🛟 The water for the yeast should be ___. (a) very salty (b) ice cold (c) boiling hot (d) warm, not hot
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 amount of sugar (b) the same bottles (c) the water temperature (d) the amount of water
9. 9.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
10. 10.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) it turns to bread (c) the balloon is bigger (d) the balloon is smaller
11. 11.📘 What is yeast? (a) a tiny living fungus (b) a kind of stone (c) a kind of salt (d) a kind of sugar
12. 12.🛟 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
13. 13.⚖️ 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 change it (c) we keep it the same
14. 14.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is the one thing we change. (a) False (b) True
15. 15.⚖️ 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
16. 16.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
17. 17.True or false: a mirror is needed for the yeast balloon. (a) True (b) False
18. 18.⚖️ 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
19. 19.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
20. 20.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows much faster (c) it turns yellow (d) it grows very little
21. 21.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to colour it (c) it is food for yeast (d) to make it heavy
22. 22.True or false: sugar is something yeast needs. (a) False (b) True
23. 23.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) warm water (c) a comb (d) a small bottle
24. 24.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a paper clip (c) a small bottle (d) warm water
25. 25.🔍 Which is the odd one out? (a) warm water (b) sunlight (c) sugar (d) time
26. 26.🔍 Which is the odd one out? (a) a magnet (b) warm water (c) vinegar (d) salt
27. 27.True or false: a magnet is something yeast needs. (a) True (b) False
28. 28.🧺 Do we need a comb 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? Which of these is what we measure? (a) the amount of water (b) the water temperature (c) size of the balloon (d) the amount of yeast
30. 30.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
31. 31.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
32. 32.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
33. 33.🔍 Which is the odd one out? (a) time (b) vinegar (c) sunlight (d) salt
34. 34.⚖️ 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) True (b) False
35. 35.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) steam (c) smoke (d) air from outside
36. 36.⚖️ 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 keep it the same (b) we measure it (c) we change it
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 what we measure. (a) False (b) True
38. 38.⚖️ 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) the amount of water (c) size of the balloon
39. 39.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it turns to sugar (c) it glows (d) the yeast is killed
40. 40.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a paper clip (c) a magnet (d) a balloon

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