Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 89 · 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.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
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.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
4. 4.⚖️ 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 yeast (b) the amount of water (c) the same bottles (d) the water temperature
5. 5.🍞 Which of these is something yeast needs? (a) sunlight (b) a magnet (c) sugar (d) vinegar
6. 6.🍞 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
7. 7.⚖️ 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 measure it (b) we keep it the same (c) we change it
8. 8.📘 What is yeast? (a) a kind of salt (b) a kind of stone (c) a kind of sugar (d) a tiny living fungus
9. 9.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
10. 10.🍞 Which of these is something yeast needs? (a) salt (b) vinegar (c) warm water (d) a magnet
11. 11.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a mirror (c) a battery cell (d) sugar
12. 12.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it turns yellow (c) it grows much faster (d) it bursts at once
13. 13.🧺 Which of these is not needed for the yeast balloon? (a) a magnet (b) dry yeast (c) a balloon (d) sugar
14. 14.True or false: warm water is needed for the yeast balloon. (a) True (b) False
15. 15.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) smoke (c) air from outside (d) steam
16. 16.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a balloon (c) a magnet (d) a battery cell
17. 17.⚖️ 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) False (b) True
18. 18.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
19. 19.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a balloon (c) warm water (d) a battery cell
20. 20.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is what we measure. (a) False (b) True
21. 21.🔍 Which is the odd one out? (a) a magnet (b) sunlight (c) vinegar (d) warm water
22. 22.True or false: time is something yeast needs. (a) True (b) False
23. 23.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) warm water (c) a mirror (d) dry yeast
24. 24.⚖️ 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
25. 25.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
26. 26.⚖️ 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
27. 27.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
28. 28.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is the one thing we change. (a) True (b) False
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 water temperature (b) the amount of yeast (c) size of the balloon (d) the amount of water
30. 30.🛟 The water for the yeast should be ___. (a) warm, not hot (b) very salty (c) boiling hot (d) ice cold
31. 31.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold water is heavy (c) cold slows yeast down (d) cold kills sugar
32. 32.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is bigger (c) the balloon is smaller (d) it shrinks to nothing
33. 33.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) a battery cell (d) a small bottle
34. 34.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) sugar (c) dry yeast (d) a small bottle
35. 35.⚖️ 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
36. 36.True or false: a comb is needed for the yeast balloon. (a) True (b) False
37. 37.True or false: a magnet is something yeast needs. (a) True (b) False
38. 38.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a small bottle (c) sugar (d) a paper clip
39. 39.True or false: a battery cell is needed for the yeast balloon. (a) False (b) True
40. 40.🔍 Which is the odd one out? (a) warm water (b) sugar (c) a magnet (d) time

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