Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 947 · 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.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a mirror (c) sugar (d) a balloon
2. 2.True or false: a magnet is not needed for the yeast balloon. (a) False (b) True
3. 3.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) turmeric powder (c) dry yeast (d) sugar
4. 4.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to make it heavy (c) to colour it (d) to make it sweet
5. 5.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
6. 6.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
7. 7.🧺 Which of these is needed for the yeast balloon? (a) a small bottle (b) a magnet (c) a comb (d) a paper clip
8. 8.🛟 The water for the yeast should be ___. (a) ice cold (b) very salty (c) boiling hot (d) warm, not hot
9. 9.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is bigger (c) the balloon is smaller (d) it turns to bread
10. 10.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) sugar (c) a paper clip (d) a small bottle
11. 11.📘 What is yeast? (a) a kind of salt (b) a kind of stone (c) a kind of sugar (d) a tiny living fungus
12. 12.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) keep it for a month (c) pour it down the sink (d) put it in your mouth
13. 13.🍞 Which of these is something yeast needs? (a) sunlight (b) time (c) a magnet (d) salt
14. 14.🍞 Which of these is something yeast needs? (a) warm water (b) sunlight (c) a magnet (d) vinegar
15. 15.🔍 Which is the odd one out? (a) time (b) salt (c) warm water (d) sugar
16. 16.⚖️ 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 keep it the same (c) we change it
17. 17.True or false: vinegar is something yeast does not need. (a) True (b) False
18. 18.True or false: warm water is something yeast needs. (a) False (b) True
19. 19.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
20. 20.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) air from outside (c) smoke (d) carbon dioxide gas
21. 21.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the same bottles”? (a) we keep it the same (b) we change it (c) we measure it
22. 22.True or false: a paper clip is not needed for the yeast balloon. (a) False (b) True
23. 23.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a mirror (c) dry yeast (d) a battery cell
24. 24.True or false: a mirror is needed for the yeast balloon. (a) False (b) True
25. 25.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) a balloon (c) warm water (d) dry yeast
26. 26.🧺 Which of these is needed for the yeast balloon? (a) a balloon (b) a comb (c) a battery cell (d) a magnet
27. 27.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
28. 28.True or false: sunlight is something yeast does not need. (a) False (b) True
29. 29.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a small bottle (c) warm water (d) a comb
30. 30.⚖️ 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) True (b) False
31. 31.🔍 Which is the odd one out? (a) time (b) a magnet (c) salt (d) vinegar
32. 32.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
33. 33.🍞 Which of these is something yeast needs? (a) vinegar (b) sugar (c) sunlight (d) a magnet
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 the one thing we change. (a) False (b) True
35. 35.⚖️ 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 sugar (c) the water temperature (d) the amount of yeast
36. 36.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a balloon (c) a comb (d) warm water
37. 37.🔍 Which is the odd one out? (a) vinegar (b) salt (c) a magnet (d) warm water
38. 38.⚖️ 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
39. 39.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a balloon (c) dry yeast (d) a magnet
40. 40.⚖️ 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 amount of sugar (c) the water temperature

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