Kitchen Chemistry Experiments Test Worksheet

Science experiments lesson 20: Part 2 test: kitchen chemistry and life · Set 690 · 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.⚖️ Fair test — does lemon juice or orange juice make darker secret writing? True or false: the iron setting is kept the same. (a) True (b) False
2. 2.🛟 Some seeds from shops are coated with chemicals. What is the safe rule? (a) throw them at friends (b) never put seeds in mouth (c) feed them to pets (d) eat a few to check
3. 3.🧺 Which of these is not needed for the leafy bag test? (a) a clear plastic bag (b) a rubber band (c) a few hours (d) yeast
4. 4.⚖️ 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
5. 5.True or false: lemon juice is neutral. (a) True (b) False
6. 6.🛟 Why should you never drink water just because it looks clear? (a) clear water is hot (b) clear water is salty (c) germs are invisible (d) clear water is sweet
7. 7.🔮 Predict: you write with plain water instead of lemon juice. What appears after ironing? (a) almost nothing (b) a rainbow (c) dark brown words (d) blue words
8. 8.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
9. 9.True or false: orange juice is neutral. (a) False (b) True
10. 10.🔮 Predict: the adult irons for only one second. What happens? (a) the paper floats (b) it gets darker (c) writing stays faint (d) writing turns green
11. 11.True or false: curd is neutral. (a) False (b) True
12. 12.🧺 Which of these is needed for making butter? (a) a battery cell (b) a jar with a tight lid (c) yeast (d) a balloon
13. 13.🌱 Which of these is not needed for a seed to sprout? (a) water (b) air (c) warmth (d) sugar
14. 14.🧺 Which of these is not needed for the leafy bag test? (a) a potted plant (b) a few hours (c) a battery cell (d) a rubber band
15. 15.🧺 Do we need a battery cell for the muddy water filter? (a) needed (b) not needed
16. 16.True or false: small stones from dal is done by handpicking. (a) False (b) True
17. 17.🔍 Which is the odd one out? (a) putting the iron away (b) dipping the cotton bud (c) reading the message (d) letting the paper dry
18. 18.True or false: a battery cell is needed for the secret lemon message. (a) False (b) True
19. 19.True or false: melting ice is a change that cannot be undone. (a) True (b) False
20. 20.⚖️ Fair test — does a cloth filter or a cotton filter give clearer water? True or false: the filter material is the one thing we change. (a) False (b) True
21. 21.True or false: salt is not needed for growing salt crystals. (a) False (b) True
22. 22.🧺 Do we need a spoon for growing salt crystals? (a) needed (b) not needed
23. 23.🪴 Which of these is a job of the stem? (a) make food in sunlight (b) hold the plant in soil (c) carry water upward (d) take in water from soil
24. 24.True or false: soap solution is a base. (a) True (b) False
25. 25.🧺 Do we need yeast for the secret lemon message? (a) not needed (b) needed
26. 26.🧺 Do we need a bowl for making butter? (a) needed (b) not needed
27. 27.🧺 Which of these is not needed for growing salt crystals? (a) salt (b) warm water (c) a shallow dish (d) a magnet
28. 28.🧺 Which of these is not needed for the muddy water filter? (a) turmeric powder (b) a funnel (c) muddy water (d) cotton or cloth
29. 29.🛟 Why must the jar lid be screwed on tightly? (a) so it gets hot (b) so it turns yellow (c) so air gets out (d) so cream does not spill
30. 30.🍞 Which of these is something yeast does not need? (a) a magnet (b) warm water (c) time (d) sugar
31. 31.True or false: a battery cell is not needed for the secret lemon message. (a) True (b) False
32. 32.🛟 Why must a plastic bag never go over anyone’s head? (a) it can block breathing (b) it changes colour (c) it is too big (d) it gets wet
33. 33.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) carbon dioxide gas (c) air from outside (d) smoke
34. 34.🔮 Predict: turmeric paper is dipped in salt water. What happens? (a) it turns black (b) it turns red (c) it turns blue (d) it stays yellow
35. 35.🧺 Three of these are needed for growing salt crystals. Which one is NOT needed? (a) a piece of string (b) a battery cell (c) warm water (d) a shallow dish
36. 36.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
37. 37.True or false: plain water is an acid. (a) True (b) False
38. 38.🧺 Which of these is needed for the leafy bag test? (a) a mirror (b) a few hours (c) turmeric powder (d) a battery cell
39. 39.🧺 Three of these are needed for the secret lemon message. Which one is NOT needed? (a) a cotton bud (b) an adult with an iron (c) a battery cell (d) lemon juice
40. 40.🧺 Three of these are needed for the leafy bag test. Which one is NOT needed? (a) a few hours (b) a mirror (c) a clear plastic bag (d) a rubber band

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