Kitchen Chemistry Experiments Test Worksheet

Science experiments lesson 20: Part 2 test: kitchen chemistry and life · Set 282 · 40 questions

What you do (Find the experiment, use the idea): 1. Read the question and find its experiment. 2. Use that experiment’s idea — acid and base, indicator colours, chemical change, what seeds and yeast need, transpiration, crystals or filtering. 3. For a fair-test question, find what is changed, kept the same and measured. 4. For a safety question, choose what keeps everyone safe.

1. 1.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
2. 2.🛟 Who should use the hot iron in the secret message experiment? (a) the youngest child (b) any child (c) whoever is fastest (d) only an adult
3. 3.🫗 Which of these is done by sieving? (a) mud from water (b) tea leaves from tea (c) bran from wheat flour (d) bad grains from rice
4. 4.⚖️ Fair test — does lemon juice or orange juice make darker secret writing? True or false: how dark the writing is is the one thing we change. (a) True (b) False
5. 5.⚖️ Fair test — do salt crystals form faster on a sunny windowsill or in a shady cupboard? True or false: sunny or shady place is kept the same. (a) False (b) True
6. 6.🍞 Which of these is something yeast needs? (a) a magnet (b) warm water (c) salt (d) sunlight
7. 7.🧺 Which of these is needed for the turmeric test? (a) a battery cell (b) lemon juice (c) a balloon (d) a magnet
8. 8.⚖️ Fair test — which liquids turn turmeric paper reddish-brown? True or false: the turmeric paper is kept the same. (a) True (b) False
9. 9.🧺 Which of these is not needed for the turmeric test? (a) a dropper or spoon (b) a comb (c) lemon juice (d) turmeric powder
10. 10.⚖️ Fair test — do salt crystals form faster on a sunny windowsill or in a shady cupboard? True or false: days to see crystals is kept the same. (a) True (b) False
11. 11.True or false: a balloon is needed for the secret lemon message. (a) True (b) False
12. 12.⚖️ Fair test — does cold cream turn into butter faster than warm cream? Which of these is the one thing we change? (a) the amount of cream (b) the cream temperature (c) the same jar (d) time to make butter
13. 13.True or false: milk turning to curd is a change that can be undone. (a) True (b) False
14. 14.True or false: orange juice is an acid. (a) True (b) False
15. 15.⚖️ Fair test — do seeds need water to sprout? Which of these is kept the same? (a) wet or dry cotton (b) how many seeds sprout (c) the same bowls
16. 16.⚖️ 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 amount of sugar
17. 17.🧈 Which of these is a change that cannot be undone? (a) freezing water (b) melting ice (c) melting butter (d) browning lemon ink
18. 18.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) throw it at a wall (c) pour it down the sink (d) keep it for a month
19. 19.🔍 Which is the odd one out? (a) sugar (b) time (c) sunlight (d) warm water
20. 20.🍋 Secret message: who does this step — dipping the cotton bud? (a) a child can do it (b) an adult does it
21. 21.⚖️ Fair test — does more baking soda blow the balloon up bigger? True or false: size of the balloon is kept the same. (a) True (b) False
22. 22.🧺 Which of these is needed for the secret lemon message? (a) a balloon (b) yeast (c) turmeric powder (d) an adult with an iron
23. 23.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a paper clip (c) a magnet (d) a small bottle
24. 24.⚖️ Fair test — does more baking soda blow the balloon up bigger? What do we do with “spoons of baking soda”? (a) we keep it the same (b) we change it (c) we measure it
25. 25.🟡 Turmeric paper meets plain water. What happens? (a) turns reddish-brown (b) stays yellow
26. 26.⚖️ Fair test — do seeds need water to sprout? What do we do with “the same place”? (a) we keep it the same (b) we change it (c) we measure it
27. 27.⚖️ 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 yeast (b) the amount of sugar (c) the same bottles (d) size of the balloon
28. 28.⚖️ Fair test — does cold cream turn into butter faster than warm cream? True or false: the cream temperature is the one thing we change. (a) True (b) False
29. 29.🍋 Which of these steps is a job a child can do? (a) ironing the paper (b) cutting the lemon (c) plugging in the iron (d) reading the message
30. 30.🧂 Does food colour dissolve in water? (a) does not dissolve (b) dissolves in water
31. 31.⚖️ Fair test — which liquids turn turmeric paper reddish-brown? What do we do with “the turmeric paper”? (a) we keep it the same (b) we change it (c) we measure it
32. 32.🛟 Why should you never drink water just because it looks clear? (a) germs are invisible (b) clear water is salty (c) clear water is sweet (d) clear water is hot
33. 33.True or false: cotton or cloth is not needed for the muddy water filter. (a) False (b) True
34. 34.🔮 Predict: you filter salty water through cloth. Does the salt stay on the cloth? (a) no, salt passes through (b) it turns to sugar (c) it turns to sand (d) yes, all of it
35. 35.🧺 Do we need a magnet for growing salt crystals? (a) not needed (b) needed
36. 36.🛟 Why must a plastic bag never go over anyone’s head? (a) it gets wet (b) it changes colour (c) it is too big (d) it can block breathing
37. 37.🧺 Three of these are needed for making butter. Which one is NOT needed? (a) fresh cream (b) a bowl (c) a timer (d) a magnet
38. 38.🧺 Three of these are needed for the turmeric test. Which one is NOT needed? (a) lemon juice (b) a magnet (c) a dropper or spoon (d) turmeric powder
39. 39.🫧 Is vinegar an acid, a base or neutral? (a) neutral (b) a base (c) an acid
40. 40.🧺 Which of these is needed for the secret lemon message? (a) white paper (b) yeast (c) a mirror (d) a balloon

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