Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 661 · 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.🛟 The water for the yeast should be ___. (a) ice cold (b) very salty (c) warm, not hot (d) boiling hot
2. 2.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
3. 3.True or false: a comb is needed for the yeast balloon. (a) False (b) True
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a small bottle (c) a magnet (d) warm water
5. 5.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a battery cell (b) dry yeast (c) a small bottle (d) warm water
6. 6.🧺 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) a balloon
7. 7.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
8. 8.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
9. 9.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
10. 10.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
11. 11.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a magnet (c) turmeric powder (d) a balloon
12. 12.True or false: a magnet is something yeast needs. (a) True (b) False
13. 13.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to make it sweet (c) to colour it (d) to make it heavy
14. 14.True or false: warm water is needed for the yeast balloon. (a) True (b) False
15. 15.True or false: a mirror is needed for the yeast balloon. (a) False (b) True
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 sugar”? (a) we measure it (b) we keep it the same (c) we change it
17. 17.True or false: sunlight is something yeast needs. (a) False (b) True
18. 18.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
19. 19.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) smoke (c) air from outside (d) steam
20. 20.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
21. 21.True or false: a balloon is not needed for the yeast balloon. (a) False (b) True
22. 22.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is what we measure. (a) True (b) False
23. 23.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows very little (c) it grows much faster (d) it bursts at once
24. 24.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
25. 25.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a battery cell (c) dry yeast (d) a magnet
26. 26.⚖️ 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 amount of water
27. 27.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a small bottle (c) a magnet (d) sugar
28. 28.True or false: vinegar is something yeast needs. (a) True (b) False
29. 29.True or false: time is something yeast needs. (a) True (b) False
30. 30.True or false: salt is something yeast does not need. (a) True (b) False
31. 31.⚖️ 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 measure it (b) we keep it the same (c) we change it
32. 32.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) vinegar (d) warm water
33. 33.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) warm water (d) a comb
34. 34.📘 What is yeast? (a) a tiny living fungus (b) a kind of stone (c) a kind of sugar (d) a kind of salt
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 yeast”? (a) we measure it (b) we keep it the same (c) we change it
36. 36.⚖️ 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 yeast (b) the amount of water (c) the water temperature (d) the amount of sugar
37. 37.🔍 Which is the odd one out? (a) vinegar (b) time (c) warm water (d) sugar
38. 38.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) keep it for a month (c) throw it at a wall (d) pour it down the sink
39. 39.🔍 Which is the odd one out? (a) warm water (b) salt (c) time (d) sugar
40. 40.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the water temperature (b) the amount of yeast (c) the amount of sugar (d) size of the balloon

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