Kitchen Chemistry Experiments Test Worksheet

Science experiments lesson 20: Part 2 test: kitchen chemistry and life · Set 424 · 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.🛟 Why must a plastic bag never go over anyone’s head? (a) it is too big (b) it changes colour (c) it gets wet (d) it can block breathing
2. 2.True or false: a balloon is not needed for the secret lemon message. (a) False (b) True
3. 3.⚖️ Fair test — does lemon juice or orange juice make darker secret writing? Which of these is the one thing we change? (a) the kind of juice (b) the iron setting (c) the same paper (d) the same cotton bud
4. 4.🫗 Which of these is done by evaporating? (a) salt from sea water (b) mud from water (c) bad grains from rice (d) gravel from fine sand
5. 5.🪴 Which of these is a job of the roots? (a) hold the plant in soil (b) hold up the leaves (c) carry water upward (d) make seeds
6. 6.⚖️ Fair test — does more baking soda blow the balloon up bigger? Which of these is the one thing we change? (a) the amount of vinegar (b) spoons of baking soda (c) the kind of balloon (d) the same bottle
7. 7.🛟 Why must children keep their fingers away from the iron? (a) it is magnetic (b) it is cold (c) it is sticky (d) it can burn skin
8. 8.⚖️ Fair test — does cold cream turn into butter faster than warm cream? Which of these is the one thing we change? (a) the same jar (b) the cream temperature (c) time to make butter (d) the amount of cream
9. 9.⚖️ Fair test — do salt crystals form faster on a sunny windowsill or in a shady cupboard? What do we do with “sunny or shady place”? (a) we change it (b) we measure it (c) we keep it the same
10. 10.🍋 Why does the lemon writing turn brown with heat? (a) the iron is brown (b) heat adds colour (c) paper turns lemony (d) the juice scorches first
11. 11.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a balloon (c) a small bottle (d) a magnet
12. 12.🧺 Three of these are needed for sprouting seeds. Which one is NOT needed? (a) a small bowl (b) a few days (c) a magnet (d) water
13. 13.🧺 Three of these are needed for making butter. Which one is NOT needed? (a) a timer (b) a jar with a tight lid (c) turmeric powder (d) cold water to rinse
14. 14.🧺 Three of these are needed for growing salt crystals. Which one is NOT needed? (a) yeast (b) a shallow dish (c) salt (d) warm water
15. 15.⚖️ Fair test — do salt crystals form faster on a sunny windowsill or in a shady cupboard? Which of these is kept the same? (a) sunny or shady place (b) days to see crystals (c) the kind of salt
16. 16.🛟 Why should you never drink water just because it looks clear? (a) clear water is salty (b) germs are invisible (c) clear water is hot (d) clear water is sweet
17. 17.True or false: gravel from fine sand is done by sieving. (a) True (b) False
18. 18.True or false: a piece of string is not needed for growing salt crystals. (a) False (b) True
19. 19.⚖️ Fair test — does more baking soda blow the balloon up bigger? Which of these is what we measure? (a) size of the balloon (b) spoons of baking soda (c) the amount of vinegar (d) the kind of balloon
20. 20.🧺 Which of these is not needed for making butter? (a) cold water to rinse (b) a bowl (c) fresh cream (d) a mirror
21. 21.🧺 Do we need a magnet for making butter? (a) needed (b) not needed
22. 22.🔍 Which is the odd one out? (a) salt (b) air (c) soil (d) sunlight
23. 23.🧺 Three of these are needed for making butter. Which one is NOT needed? (a) a battery cell (b) a jar with a tight lid (c) fresh cream (d) a timer
24. 24.⚖️ 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 change it (b) we keep it the same (c) we measure it
25. 25.🧺 Which of these is needed for sprouting seeds? (a) yeast (b) a magnet (c) cotton wool (d) a mirror
26. 26.True or false: cotton wool is needed for sprouting seeds. (a) False (b) True
27. 27.⚖️ Fair test — do salt crystals form faster on a sunny windowsill or in a shady cupboard? What do we do with “the amount of water”? (a) we change it (b) we measure it (c) we keep it the same
28. 28.🍋 Which of these steps is a job a child can do? (a) plugging in the iron (b) ironing the paper (c) reading the message (d) cutting the lemon
29. 29.🫧 Is plain water an acid, a base or neutral? (a) an acid (b) a base (c) neutral
30. 30.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
31. 31.🟡 Turmeric paper meets detergent water. What happens? (a) stays yellow (b) turns reddish-brown
32. 32.🛟 Which safety rule fits the fizzy balloon experiment? (a) keep it away from eyes (b) seal it in a glass jar (c) shake it near your face (d) put it in your mouth
33. 33.⚖️ Fair test — does a cloth filter or a cotton filter give clearer water? Which of these is what we measure? (a) the same glass (b) the amount poured (c) how clear the water is (d) the same funnel
34. 34.True or false: cold water to rinse is needed for making butter. (a) True (b) False
35. 35.True or false: a small bottle is needed for the yeast balloon. (a) True (b) False
36. 36.True or false: warmth is needed for a seed to sprout. (a) False (b) True
37. 37.🍋 Secret message: who does this step — putting the iron away? (a) an adult does it (b) a child can do it
38. 38.🧺 Which of these is needed for growing salt crystals? (a) a magnet (b) a spoon (c) turmeric powder (d) a mirror
39. 39.🔮 Predict: you stop shaking after only one minute. What do you have? (a) cheese (b) ghee (c) butter lumps (d) still runny cream
40. 40.🧂 Which of these does not dissolve in water? (a) glucose powder (b) sugar (c) small pebbles (d) food colour

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