Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 551 · 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.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a small bottle (c) a magnet (d) dry yeast
2. 2.True or false: salt is something yeast does not need. (a) False (b) True
3. 3.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) warm water (c) a comb (d) a small bottle
4. 4.True or false: a small bottle is needed for the yeast balloon. (a) False (b) True
5. 5.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a small bottle (c) dry yeast (d) a battery cell
6. 6.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to clean floors (c) to make bread rise (d) to colour rice
7. 7.📘 What is yeast? (a) a kind of stone (b) a tiny living fungus (c) a kind of sugar (d) a kind of salt
8. 8.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
9. 9.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
10. 10.True or false: a magnet is something yeast needs. (a) False (b) True
11. 11.⚖️ 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 keep it the same (b) we measure it (c) we change it
12. 12.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it turns to sugar (c) it grows faster (d) the yeast is killed
13. 13.🛟 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
14. 14.🛟 The water for the yeast should be ___. (a) ice cold (b) very salty (c) boiling hot (d) warm, not hot
15. 15.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it turns yellow (c) it bursts at once (d) it grows very little
16. 16.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
17. 17.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
18. 18.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) a mirror (d) a balloon
19. 19.🔍 Which is the odd one out? (a) vinegar (b) sunlight (c) salt (d) warm water
20. 20.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a battery cell (c) dry yeast (d) warm water
21. 21.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
22. 22.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to make it sweet (c) it is food for yeast (d) to colour it
23. 23.🔍 Which is the odd one out? (a) sunlight (b) salt (c) time (d) a magnet
24. 24.🔍 Which is the odd one out? (a) sunlight (b) time (c) sugar (d) warm water
25. 25.🍞 Which of these is something yeast does not need? (a) vinegar (b) sugar (c) warm water (d) time
26. 26.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) steam (c) smoke (d) carbon dioxide gas
27. 27.True or false: salt is something yeast needs. (a) False (b) True
28. 28.⚖️ 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 keep it the same (b) we change it (c) we measure it
29. 29.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) it turns to bread (c) it shrinks to nothing (d) the balloon is bigger
30. 30.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) dry yeast (c) a paper clip (d) a mirror
31. 31.⚖️ 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
32. 32.True or false: warm water is something yeast needs. (a) True (b) False
33. 33.⚖️ 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 water (b) the amount of yeast (c) the water temperature (d) the amount of sugar
34. 34.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is what we measure. (a) False (b) True
35. 35.True or false: a mirror is not needed for the yeast balloon. (a) True (b) False
36. 36.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
37. 37.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
38. 38.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) salt (d) warm water
39. 39.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
40. 40.⚖️ 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 change it (b) we measure it (c) we keep it the same

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