Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 755 · 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.⚖️ 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) False (b) True
2. 2.True or false: dry yeast 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) dry yeast (b) a magnet (c) a small bottle (d) sugar
4. 4.🔍 Which is the odd one out? (a) vinegar (b) sugar (c) sunlight (d) a magnet
5. 5.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) throw it at a wall (c) keep it for a month (d) put it in your mouth
6. 6.🔮 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
7. 7.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
8. 8.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
9. 9.⚖️ 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 keep it the same (c) we change it
10. 10.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a paper clip (c) a small bottle (d) warm water
11. 11.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
12. 12.🔍 Which is the odd one out? (a) warm water (b) time (c) a magnet (d) sugar
13. 13.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the amount of sugar (b) the amount of water (c) the same bottles (d) size of the balloon
14. 14.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
15. 15.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
16. 16.True or false: warm water is something yeast needs. (a) False (b) True
17. 17.🔍 Which is the odd one out? (a) vinegar (b) warm water (c) time (d) sugar
18. 18.⚖️ 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
19. 19.True or false: time is something yeast does not need. (a) True (b) False
20. 20.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
21. 21.🧺 Which of these is not needed for the yeast balloon? (a) a battery cell (b) a balloon (c) a small bottle (d) dry yeast
22. 22.🔍 Which is the odd one out? (a) warm water (b) sugar (c) time (d) sunlight
23. 23.True or false: vinegar is something yeast does not need. (a) False (b) True
24. 24.🔮 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
25. 25.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) smoke (c) air from outside (d) carbon dioxide gas
26. 26.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a small bottle (c) warm water (d) turmeric powder
27. 27.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
28. 28.🍞 Why do we add sugar to the yeast? (a) to colour it (b) it is food for yeast (c) to make it sweet (d) to make it heavy
29. 29.⚖️ 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) False (b) True
30. 30.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
31. 31.True or false: a balloon is needed for the yeast balloon. (a) True (b) False
32. 32.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it bursts at once (c) it turns yellow (d) it grows very little
33. 33.True or false: turmeric powder is needed for the yeast balloon. (a) True (b) False
34. 34.⚖️ 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 keep it the same (b) we measure it (c) we change it
35. 35.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) turmeric powder (c) a balloon (d) warm water
36. 36.True or false: salt is something yeast needs. (a) True (b) False
37. 37.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) warm, not hot (d) very salty
38. 38.📘 What is yeast? (a) a tiny living fungus (b) a kind of sugar (c) a kind of stone (d) a kind of salt
39. 39.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
40. 40.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a battery cell (c) a paper clip (d) sugar

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