Kitchen Chemistry Experiments Test Worksheet

Science experiments lesson 20: Part 2 test: kitchen chemistry and life · Set 464 · 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.🟡 Which of these turns turmeric reddish-brown? (a) lemon juice (b) detergent water (c) vinegar (d) sugar water
2. 2.🔮 Predict: you write with plain water instead of lemon juice. What appears after ironing? (a) dark brown words (b) blue words (c) a rainbow (d) almost nothing
3. 3.⚖️ 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 amount of yeast (d) the same bottles
4. 4.🍋 Secret message: who does this step — dipping the cotton bud? (a) an adult does it (b) a child can do it
5. 5.⚖️ Fair test — does cold cream turn into butter faster than warm cream? True or false: time to make butter is kept the same. (a) False (b) True
6. 6.True or false: a clean glass is needed for the muddy water filter. (a) True (b) False
7. 7.⚖️ Fair test — does a plant in the sun give out more water than one in the shade? True or false: the size of the plant is kept the same. (a) False (b) True
8. 8.🔮 The fizzing stops after a while. Why? (a) an ingredient ran out (b) the bottle got tired (c) the balloon got cold (d) the gas froze
9. 9.🧺 Do we need yeast for the muddy water filter? (a) not needed (b) needed
10. 10.🧺 Three of these are needed for sprouting seeds. Which one is NOT needed? (a) a few days (b) a small bowl (c) a balloon (d) moong seeds
11. 11.🛟 Why must a plastic bag never go over anyone’s head? (a) it changes colour (b) it is too big (c) it can block breathing (d) it gets wet
12. 12.🧈 Which of these is a change that cannot be undone? (a) dissolving salt (b) melting ice (c) rusting iron (d) freezing water
13. 13.True or false: bran from wheat flour is done by handpicking. (a) False (b) True
14. 14.🧺 Which of these is not needed for the muddy water filter? (a) a clean glass (b) a mirror (c) sand and pebbles (d) a funnel
15. 15.🧺 Which of these is not needed for the turmeric test? (a) white paper strips (b) turmeric powder (c) a magnet (d) water
16. 16.🔮 Predict: you use more vinegar and more baking soda. What happens to the balloon? (a) there is no change (b) it shrinks (c) it grows bigger (d) it turns blue
17. 17.⚖️ Fair test — does more baking soda blow the balloon up bigger? What do we do with “the amount of vinegar”? (a) we change it (b) we measure it (c) we keep it the same
18. 18.⚖️ Fair test — does a cloth filter or a cotton filter give clearer water? Which of these is what we measure? (a) the amount poured (b) how clear the water is (c) the same funnel (d) the filter material
19. 19.True or false: soap solution turns turmeric reddish-brown. (a) True (b) False
20. 20.🔮 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
21. 21.🫧 Which of these is a base? (a) curd (b) baking soda water (c) lemon juice (d) sugar water
22. 22.True or false: a balloon is needed for growing salt crystals. (a) True (b) False
23. 23.🔮 Predict: you pour muddy water through two layers of cloth instead of one. The water comes out ___. (a) hot (b) muddier (c) salty (d) clearer
24. 24.🧺 Do we need a magnet for the secret lemon message? (a) not needed (b) needed
25. 25.🧺 Do we need cotton wool for sprouting seeds? (a) not needed (b) needed
26. 26.⚖️ Fair test — does a cloth filter or a cotton filter give clearer water? What do we do with “how clear the water is”? (a) we change it (b) we keep it the same (c) we measure it
27. 27.🍋 Why can’t you see the lemon writing once it dries? (a) it turned into air (b) the ink is magnetic (c) the paper ate it (d) dry juice is see-through
28. 28.🔮 Predict: a yellow curry stain on a shirt is washed with soap. What colour may it turn? (a) white at once (b) bright blue (c) reddish (d) green
29. 29.🛟 What should you do after touching soil or seeds? (a) lick your fingers (b) skip washing (c) rub your eyes (d) wash your hands
30. 30.True or false: a mirror is not needed for growing salt crystals. (a) True (b) False
31. 31.🧺 Which of these is needed for the leafy bag test? (a) a battery cell (b) turmeric powder (c) a rubber band (d) vinegar
32. 32.🔮 Predict: sprouts grow in the dark for a week. What colour are their leaves? (a) dark green (b) pale yellow (c) blue (d) bright red
33. 33.True or false: a battery cell is not needed for growing salt crystals. (a) True (b) False
34. 34.🧺 Which of these is not needed for the muddy water filter? (a) muddy water (b) turmeric powder (c) a funnel (d) sand and pebbles
35. 35.True or false: rusting iron is a change that cannot be undone. (a) True (b) False
36. 36.🫗 How do we separate bran from wheat flour? (a) handpicking (b) evaporating (c) filtering (d) sieving
37. 37.🪴 Which of these is a job of the leaves? (a) hold the plant in soil (b) give out water vapour (c) carry water upward (d) make seeds
38. 38.True or false: yeast is needed for the secret lemon message. (a) False (b) True
39. 39.⚖️ 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) size of the balloon (c) the amount of water (d) the water temperature
40. 40.🔍 Which is the odd one out? (a) sand (b) chalk powder (c) sugar (d) cooking oil

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