Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 351 · 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.True or false: turmeric powder is needed for the yeast balloon. (a) False (b) True
2. 2.⚖️ 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 keep it the same (c) we measure it
3. 3.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) smoke (c) air from outside (d) steam
4. 4.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of yeast”? (a) we measure it (b) we change it (c) we keep it the same
5. 5.True or false: sugar is something yeast needs. (a) True (b) False
6. 6.⚖️ 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 sugar (b) size of the balloon (c) the water temperature (d) the same bottles
7. 7.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
8. 8.🔮 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
9. 9.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a battery cell (c) sugar (d) a magnet
10. 10.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to colour it (c) to make it heavy (d) it is food for yeast
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 water”? (a) we change it (b) we measure it (c) we keep it the same
12. 12.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a comb (c) dry yeast (d) a small bottle
13. 13.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
14. 14.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it bursts at once (c) it grows very little (d) it turns yellow
15. 15.⚖️ 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
16. 16.🛟 The water for the yeast should be ___. (a) warm, not hot (b) very salty (c) boiling hot (d) ice cold
17. 17.🧺 Which of these is not needed for the yeast balloon? (a) a battery cell (b) a balloon (c) dry yeast (d) sugar
18. 18.🔍 Which is the odd one out? (a) vinegar (b) salt (c) warm water (d) sunlight
19. 19.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
20. 20.True or false: a magnet is needed for the yeast balloon. (a) False (b) True
21. 21.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
22. 22.⚖️ 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) True (b) False
23. 23.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
24. 24.🔍 Which is the odd one out? (a) a magnet (b) time (c) warm water (d) sugar
25. 25.True or false: warm water is something yeast does not need. (a) True (b) False
26. 26.True or false: time is something yeast does not need. (a) True (b) False
27. 27.📘 What is yeast? (a) a kind of salt (b) a kind of sugar (c) a tiny living fungus (d) a kind of stone
28. 28.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
29. 29.True or false: a small bottle is not needed for the yeast balloon. (a) False (b) True
30. 30.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a magnet (c) dry yeast (d) sugar
31. 31.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the same bottles (b) the water temperature (c) size of the balloon
32. 32.True or false: time is something yeast needs. (a) False (b) True
33. 33.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a small bottle (c) a paper clip (d) sugar
34. 34.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) keep it for a month (c) put it in your mouth (d) pour it down the sink
35. 35.True or false: salt is something yeast needs. (a) True (b) False
36. 36.True or false: sugar is something yeast does not need. (a) False (b) True
37. 37.True or false: a magnet is something yeast needs. (a) False (b) True
38. 38.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is the one thing we change. (a) True (b) False
39. 39.🍞 Which of these is something yeast does not need? (a) salt (b) sugar (c) warm water (d) time
40. 40.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it

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