Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 48 · 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? What do we do with “the water temperature”? (a) we measure it (b) we change it (c) we keep it the same
2. 2.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is smaller (c) it turns to bread (d) the balloon is bigger
3. 3.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) time (d) salt
4. 4.🛟 The water for the yeast should be ___. (a) ice cold (b) very salty (c) warm, not hot (d) boiling hot
5. 5.🍞 Which of these is something yeast needs? (a) salt (b) warm water (c) sunlight (d) a magnet
6. 6.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
7. 7.True or false: sunlight is something yeast needs. (a) False (b) True
8. 8.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
9. 9.📘 What is yeast? (a) a kind of salt (b) a tiny living fungus (c) a kind of sugar (d) a kind of stone
10. 10.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
11. 11.⚖️ 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 change it (b) we measure it (c) we keep it the same
12. 12.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) sunlight (d) time
13. 13.⚖️ 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 water temperature (c) the amount of sugar
14. 14.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
15. 15.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
16. 16.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a balloon (c) a paper clip (d) warm water
17. 17.🔍 Which is the odd one out? (a) a magnet (b) sunlight (c) salt (d) sugar
18. 18.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
19. 19.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it grows very little (c) it bursts at once (d) it turns yellow
20. 20.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to make it heavy (c) it is food for yeast (d) to colour it
21. 21.⚖️ 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
22. 22.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a comb (c) a balloon (d) a mirror
23. 23.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) a balloon (c) dry yeast (d) sugar
24. 24.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
25. 25.⚖️ 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) True (b) False
26. 26.True or false: a balloon is needed for the yeast balloon. (a) True (b) False
27. 27.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) a magnet (d) a small bottle
28. 28.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
29. 29.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) sugar (c) dry yeast (d) a battery cell
30. 30.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) carbon dioxide gas (c) smoke (d) steam
31. 31.⚖️ 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) False (b) True
32. 32.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a battery cell (c) dry yeast (d) turmeric powder
33. 33.True or false: vinegar is something yeast needs. (a) True (b) False
34. 34.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
35. 35.True or false: sugar is needed for the yeast balloon. (a) True (b) False
36. 36.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a battery cell (c) a mirror (d) warm water
37. 37.True or false: warm water is something yeast does not need. (a) True (b) False
38. 38.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
39. 39.🍞 Which of these is something yeast does not need? (a) a magnet (b) sugar (c) warm water (d) time
40. 40.⚖️ 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) True (b) False

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