Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 672 · 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: a balloon is needed for the yeast balloon. (a) False (b) True
2. 2.🔍 Which is the odd one out? (a) time (b) sugar (c) warm water (d) vinegar
3. 3.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) throw it at a wall (c) pour it down the sink (d) put it in your mouth
4. 4.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is smaller (c) the balloon is bigger (d) it turns to bread
5. 5.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) turmeric powder (c) a balloon (d) dry yeast
6. 6.🔮 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
7. 7.⚖️ 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
8. 8.🧺 Which of these is needed for the yeast balloon? (a) a balloon (b) a battery cell (c) turmeric powder (d) a magnet
9. 9.True or false: a mirror is needed for the yeast balloon. (a) True (b) False
10. 10.🔍 Which is the odd one out? (a) time (b) sugar (c) warm water (d) a magnet
11. 11.True or false: a battery cell is not needed for the yeast balloon. (a) True (b) False
12. 12.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
13. 13.🔍 Which is the odd one out? (a) sugar (b) warm water (c) salt (d) time
14. 14.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it turns to sugar (c) it grows faster (d) it glows
15. 15.⚖️ 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 measure it (b) we keep it the same (c) we change it
16. 16.📘 What is yeast? (a) a kind of stone (b) a kind of sugar (c) a kind of salt (d) a tiny living fungus
17. 17.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
18. 18.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
19. 19.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a balloon (c) a mirror (d) a small bottle
20. 20.🛟 The water for the yeast should be ___. (a) warm, not hot (b) ice cold (c) very salty (d) boiling hot
21. 21.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) warm water (c) dry yeast (d) a small bottle
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) False (b) True
23. 23.🍞 Which of these is something yeast needs? (a) vinegar (b) sunlight (c) a magnet (d) sugar
24. 24.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) it is food for yeast (c) to make it sweet (d) to colour it
25. 25.🔍 Which is the odd one out? (a) sunlight (b) salt (c) time (d) vinegar
26. 26.🍞 Which of these is something yeast does not need? (a) time (b) sunlight (c) sugar (d) warm water
27. 27.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
28. 28.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) dry yeast (c) warm water (d) a paper clip
29. 29.⚖️ 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 yeast (c) the water temperature
30. 30.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
31. 31.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) air from outside (c) smoke (d) carbon dioxide gas
32. 32.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
33. 33.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
34. 34.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the water temperature (b) size of the balloon (c) the same bottles
35. 35.⚖️ 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 change it (c) we keep it the same
36. 36.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) dry yeast (c) a comb (d) a magnet
37. 37.True or false: sugar is something yeast needs. (a) False (b) True
38. 38.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
39. 39.True or false: sunlight is something yeast does not need. (a) True (b) False
40. 40.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a small bottle (c) turmeric powder (d) a comb

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