Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 376 · 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.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it bursts at once (c) it turns yellow (d) it grows very little
2. 2.True or false: a small bottle is needed for the yeast balloon. (a) True (b) False
3. 3.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it glows (c) it grows faster (d) it turns to sugar
4. 4.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
5. 5.True or false: warm water is something yeast needs. (a) False (b) True
6. 6.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) smoke (c) steam (d) carbon dioxide gas
7. 7.📘 What is yeast? (a) a kind of sugar (b) a kind of stone (c) a kind of salt (d) a tiny living fungus
8. 8.🔍 Which is the odd one out? (a) sugar (b) salt (c) a magnet (d) vinegar
9. 9.True or false: sugar is needed for the yeast balloon. (a) False (b) True
10. 10.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
11. 11.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
12. 12.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a magnet (c) sugar (d) a small bottle
13. 13.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) warm water (d) a magnet
14. 14.⚖️ 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
15. 15.⚖️ 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 water (c) the water temperature (d) the same bottles
16. 16.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is kept the same. (a) True (b) False
17. 17.True or false: dry yeast is not 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? True or false: size of the balloon is what we measure. (a) False (b) True
19. 19.🍞 Which of these is something yeast needs? (a) salt (b) a magnet (c) warm water (d) vinegar
20. 20.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) turmeric powder (c) warm water (d) a balloon
21. 21.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is what we measure. (a) False (b) True
22. 22.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) turmeric powder (c) a comb (d) a balloon
23. 23.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a magnet (c) warm water (d) a comb
24. 24.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
25. 25.🍞 Which of these is something yeast needs? (a) vinegar (b) time (c) a magnet (d) salt
26. 26.⚖️ 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 yeast
27. 27.True or false: sugar is something yeast does not need. (a) False (b) True
28. 28.True or false: a battery cell is needed for the yeast balloon. (a) False (b) True
29. 29.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
30. 30.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) a paper clip (c) sugar (d) a balloon
31. 31.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
32. 32.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
33. 33.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) warm water (c) a small bottle (d) a comb
34. 34.⚖️ 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 measure it (b) we change it (c) we keep it the same
35. 35.True or false: salt is something yeast does not need. (a) False (b) True
36. 36.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) pour it down the sink (c) keep it for a month (d) put it in your mouth
37. 37.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
38. 38.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) sugar (c) a magnet (d) turmeric powder
39. 39.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to make it sweet (c) to colour it (d) it is food for yeast
40. 40.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) warm, not hot (d) very salty

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