Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 499 · 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.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
2. 2.⚖️ 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
3. 3.⚖️ 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
4. 4.📘 What is yeast? (a) a kind of salt (b) a kind of stone (c) a kind of sugar (d) a tiny living fungus
5. 5.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) it shrinks to nothing (c) the balloon is bigger (d) it turns to bread
6. 6.True or false: vinegar is something yeast needs. (a) False (b) True
7. 7.True or false: time is something yeast does not need. (a) True (b) False
8. 8.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to colour it (c) it is food for yeast (d) to make it sweet
9. 9.⚖️ 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 amount of yeast
10. 10.🔍 Which is the odd one out? (a) time (b) warm water (c) sugar (d) sunlight
11. 11.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to make bread rise (c) to wash dishes (d) to clean floors
12. 12.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) pour it down the sink (c) put it in your mouth (d) keep it for a month
13. 13.🛟 The water for the yeast should be ___. (a) ice cold (b) very salty (c) boiling hot (d) warm, not hot
14. 14.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
15. 15.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) sugar (d) vinegar
16. 16.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) the yeast is killed (c) it glows (d) it grows faster
17. 17.True or false: sunlight is something yeast needs. (a) True (b) False
18. 18.🔍 Which is the odd one out? (a) time (b) a magnet (c) vinegar (d) salt
19. 19.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a mirror (c) sugar (d) a magnet
20. 20.🍞 Which of these is something yeast needs? (a) sunlight (b) a magnet (c) vinegar (d) sugar
21. 21.True or false: a magnet is something yeast does not need. (a) False (b) True
22. 22.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) a balloon (c) dry yeast (d) a small bottle
23. 23.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold water is heavy (c) cold makes it pink (d) cold kills sugar
24. 24.True or false: warm water is needed for the yeast balloon. (a) True (b) False
25. 25.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
26. 26.🧺 Which of these is not needed for the yeast balloon? (a) a magnet (b) sugar (c) a small bottle (d) warm water
27. 27.True or false: sugar is something yeast needs. (a) True (b) False
28. 28.⚖️ 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
29. 29.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
30. 30.True or false: a comb is needed for the yeast balloon. (a) True (b) False
31. 31.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) a battery cell (d) a balloon
32. 32.🔍 Which is the odd one out? (a) time (b) warm water (c) a magnet (d) sugar
33. 33.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
34. 34.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
35. 35.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
36. 36.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
37. 37.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
38. 38.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it bursts at once (c) it grows very little (d) it grows much faster
39. 39.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) air from outside (c) smoke (d) carbon dioxide gas
40. 40.True or false: turmeric powder is needed for the yeast balloon. (a) False (b) True

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