Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 957 · 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.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) pour it down the sink (c) throw it at a wall (d) put it in your mouth
2. 2.🍞 Does yeast need a magnet 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) dry yeast (b) a balloon (c) a small bottle (d) a battery cell
5. 5.True or false: a paper clip is needed for the yeast balloon. (a) False (b) True
6. 6.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) warm water (d) salt
7. 7.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
8. 8.⚖️ 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
9. 9.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to colour it (c) to make it sweet (d) to make it heavy
10. 10.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is kept the same. (a) True (b) False
11. 11.🔍 Which is the odd one out? (a) vinegar (b) warm water (c) salt (d) a magnet
12. 12.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is kept the same. (a) False (b) True
13. 13.⚖️ 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
14. 14.📘 What is yeast? (a) a kind of sugar (b) a tiny living fungus (c) a kind of salt (d) a kind of stone
15. 15.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) sugar (c) a mirror (d) a comb
16. 16.🍞 Which of these is something yeast needs? (a) salt (b) vinegar (c) time (d) a magnet
17. 17.⚖️ 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 sugar (b) the same bottles (c) the amount of yeast (d) the water temperature
18. 18.⚖️ 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 water temperature (c) the same bottles
19. 19.True or false: a mirror is needed for the yeast balloon. (a) False (b) True
20. 20.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a mirror (c) a magnet (d) a balloon
21. 21.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a paper clip (d) warm water
22. 22.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a comb (c) a balloon (d) dry yeast
23. 23.True or false: warm water is something yeast needs. (a) True (b) False
24. 24.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) very salty (d) warm, not hot
25. 25.🍞 Which of these is something yeast needs? (a) warm water (b) vinegar (c) salt (d) sunlight
26. 26.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a magnet (c) a battery cell (d) a small bottle
27. 27.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
28. 28.🔍 Which is the odd one out? (a) warm water (b) sugar (c) a magnet (d) time
29. 29.True or false: time is something yeast needs. (a) True (b) False
30. 30.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a magnet (c) a battery cell (d) dry yeast
31. 31.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
32. 32.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
33. 33.⚖️ 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 measure it (b) we keep it the same (c) we change it
34. 34.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) sugar (d) turmeric powder
35. 35.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a mirror (c) warm water (d) a balloon
36. 36.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
37. 37.⚖️ 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 water temperature (c) the amount of yeast (d) size of the balloon
38. 38.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
39. 39.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is kept the same. (a) False (b) True
40. 40.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it turns yellow (c) it grows very little (d) it bursts at once

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