Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 839 · 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.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) it is food for yeast (c) to make it heavy (d) to colour it
2. 2.True or false: a paper clip is needed for the yeast balloon. (a) False (b) True
3. 3.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) a balloon (d) a magnet
5. 5.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) warm water (c) sugar (d) a small bottle
6. 6.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
7. 7.⚖️ 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) size of the balloon (c) the amount of water
8. 8.True or false: a balloon is needed for the yeast balloon. (a) False (b) True
9. 9.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a comb (c) warm water (d) turmeric powder
10. 10.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the same bottles (b) size of the balloon (c) the water temperature (d) the amount of yeast
11. 11.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
12. 12.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) very salty (d) warm, not hot
13. 13.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) sugar (d) a magnet
14. 14.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) carbon dioxide gas (c) smoke (d) steam
15. 15.⚖️ 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 same bottles (c) the water temperature
16. 16.True or false: time is something yeast does not need. (a) False (b) True
17. 17.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) the yeast is killed (c) it turns to sugar (d) it grows faster
18. 18.⚖️ 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
19. 19.⚖️ 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
20. 20.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
21. 21.🍞 Which of these is something yeast needs? (a) vinegar (b) salt (c) warm water (d) a magnet
22. 22.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) sugar (c) a balloon (d) a comb
23. 23.🧺 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
24. 24.⚖️ 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 keep it the same (b) we measure it (c) we change it
25. 25.📘 What is yeast? (a) a kind of sugar (b) a kind of stone (c) a tiny living fungus (d) a kind of salt
26. 26.⚖️ 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
27. 27.🔍 Which is the odd one out? (a) salt (b) warm water (c) sunlight (d) vinegar
28. 28.🧺 Do we need a paper clip 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 same bottles (b) the amount of water (c) the water temperature (d) the amount of sugar
30. 30.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
31. 31.True or false: sugar is something yeast needs. (a) True (b) False
32. 32.🔍 Which is the odd one out? (a) sunlight (b) vinegar (c) salt (d) time
33. 33.⚖️ 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
34. 34.⚖️ 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) True (b) False
35. 35.True or false: time is something yeast needs. (a) True (b) False
36. 36.True or false: sunlight is something yeast needs. (a) True (b) False
37. 37.True or false: a comb is needed for the yeast balloon. (a) True (b) False
38. 38.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows much faster (c) it grows very little (d) it bursts at once
39. 39.True or false: salt is something yeast needs. (a) False (b) True
40. 40.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed

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