Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 949 · 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.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold kills sugar (c) cold makes it pink (d) cold slows yeast down
2. 2.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
3. 3.True or false: a balloon is not needed for the yeast balloon. (a) False (b) True
4. 4.📘 What is yeast? (a) a kind of sugar (b) a tiny living fungus (c) a kind of stone (d) a kind of salt
5. 5.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) keep it for a month (c) pour it down the sink (d) throw it at a wall
6. 6.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) the yeast is killed (c) it turns to sugar (d) it grows faster
7. 7.🔮 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
8. 8.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) turmeric powder (b) sugar (c) a small bottle (d) dry yeast
9. 9.🔍 Which is the odd one out? (a) warm water (b) time (c) sugar (d) a magnet
10. 10.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it grows much faster (c) it turns yellow (d) it bursts at once
11. 11.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
12. 12.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) sugar (d) a magnet
13. 13.True or false: a comb is not needed for the yeast balloon. (a) False (b) True
14. 14.True or false: a mirror is not needed for the yeast balloon. (a) False (b) True
15. 15.True or false: sunlight is something yeast does not need. (a) False (b) True
16. 16.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
17. 17.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
18. 18.🧺 Which of these is needed for the yeast balloon? (a) sugar (b) a mirror (c) a comb (d) a paper clip
19. 19.⚖️ 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 change it (c) we keep it the same
20. 20.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
21. 21.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
22. 22.⚖️ 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 sugar
23. 23.⚖️ 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
24. 24.🛟 The water for the yeast should be ___. (a) warm, not hot (b) ice cold (c) very salty (d) boiling hot
25. 25.🔍 Which is the odd one out? (a) warm water (b) sugar (c) time (d) vinegar
26. 26.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a balloon (c) turmeric powder (d) sugar
27. 27.True or false: warm water is something yeast needs. (a) True (b) False
28. 28.🧺 Which of these is needed for the yeast balloon? (a) a balloon (b) a battery cell (c) a magnet (d) a mirror
29. 29.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a small bottle (c) a balloon (d) a comb
30. 30.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) a balloon (c) sugar (d) dry yeast
31. 31.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) smoke (c) carbon dioxide gas (d) steam
32. 32.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to make it sweet (c) to make it heavy (d) to colour it
33. 33.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
34. 34.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to wash dishes (c) to make bread rise (d) to colour rice
35. 35.🍞 Which of these is something yeast needs? (a) sunlight (b) vinegar (c) a magnet (d) time
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 water temperature (b) the amount of sugar (c) the same bottles (d) the amount of yeast
37. 37.True or false: vinegar is something yeast does not need. (a) True (b) False
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 water temperature is the one thing we change. (a) True (b) False
40. 40.⚖️ 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

Free science experiments lessons, practice and worksheets at talentjr.in/science-experiments-for-kids