Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 901 · 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.⚖️ 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) False (b) True
2. 2.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) put it in your mouth (c) pour it down the sink (d) keep it for a month
3. 3.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a comb (c) sugar (d) a battery cell
4. 4.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold kills sugar (c) cold makes it pink (d) cold water is heavy
5. 5.🧺 Which of these is not needed for the yeast balloon? (a) a paper clip (b) warm water (c) sugar (d) dry yeast
6. 6.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a paper clip (c) sugar (d) a balloon
7. 7.True or false: a battery cell is needed for the yeast balloon. (a) False (b) True
8. 8.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) sugar (c) a magnet (d) a small bottle
9. 9.⚖️ 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
10. 10.🔍 Which is the odd one out? (a) sunlight (b) sugar (c) salt (d) vinegar
11. 11.🛟 The water for the yeast should be ___. (a) ice cold (b) very salty (c) warm, not hot (d) boiling hot
12. 12.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows very little (c) it grows much faster (d) it turns yellow
13. 13.📘 What is yeast? (a) a tiny living fungus (b) a kind of stone (c) a kind of sugar (d) a kind of salt
14. 14.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a battery cell (c) dry yeast (d) a comb
15. 15.⚖️ 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
16. 16.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
17. 17.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a paper clip (c) a mirror (d) warm water
18. 18.⚖️ 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 same bottles
19. 19.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) it is food for yeast (c) to make it sweet (d) to colour it
20. 20.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) a comb (d) dry yeast
21. 21.🔍 Which is the odd one out? (a) warm water (b) time (c) salt (d) sugar
22. 22.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a balloon (c) a mirror (d) a small bottle
23. 23.⚖️ 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 change it (b) we keep it the same (c) we measure it
24. 24.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is what we measure. (a) False (b) True
25. 25.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
26. 26.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) the yeast is killed (c) it glows (d) it turns to sugar
27. 27.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
28. 28.🔍 Which is the odd one out? (a) time (b) warm water (c) sugar (d) sunlight
29. 29.🧺 Which of these is needed for the yeast balloon? (a) a small bottle (b) a battery cell (c) a magnet (d) turmeric powder
30. 30.🍞 Which of these is something yeast needs? (a) vinegar (b) a magnet (c) warm water (d) salt
31. 31.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
32. 32.⚖️ 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
33. 33.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a battery cell (c) a balloon (d) a comb
34. 34.⚖️ 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 amount of yeast (d) the same bottles
35. 35.⚖️ 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
36. 36.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) it turns to bread (c) the balloon is bigger (d) it shrinks to nothing
37. 37.⚖️ 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 sugar (c) size of the balloon
38. 38.True or false: sugar is something yeast does not need. (a) False (b) True
39. 39.🍞 Which of these is something yeast does not need? (a) warm water (b) salt (c) time (d) sugar
40. 40.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it

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