can u tell me 20 compounds with their chemical and common names?

Answer 1

will help with a few:
Chemical name ----- Common name
Calcium carbonate ---- Limestone
Calcium hydroxide---- lime, slaked lime or portlandite
Calcium oxide ..... quicklime
Magnesium carbonate ---- Dolomite
Iron sulfide FeS2 ---- Fool's gold or pyrite
Sodium Chloride ---- Table salt
Copper sulfate ---- blue vitriol
Ethanol ..... wine spirit, grain alcohol,
Calcium sulfate dihydrate ----- Gypsum
Calcium sulfate hemihydrate ----- Plaster
Sodium carbonate ----- Soda ash
Sodium bicarbonate ---- Baking soda
Sodium hydroxide ---- Caustic Soda

Answer 2

H20 Water

CO2 Carbon Dioxide

CO Carbon Monoxide

NaCl Table salt

G6H12O6 Glucose

Nope, I tried but alas, I am a failure at this as well.

Answer 3

Common name -------- Chemical name

Rust -------- Hydrated iron(III) oxide
Baking soda -------- Sodium hydrogencarbonate
Lime -------- Calcium oxide
Slaked lime -------- Calcium hydroxide
Limestone -------- Calcium carbonate
Plaster of Paris -------- Calcium sulphate
Oil of vitriol -------- Sulphuric acid
Muriatic acid -------- Hydrochloric acid
Aqua fortis -------- Nitric acid
Bleach -------- Sodium chlorate(I)
Vitamin C -------- (R)-3,4-dihydroxy-5-((S)- 1,2-dihydroxyethyl)furan-2(5H)-one
Vitamin E -------- (2R)-2,5,7,8-Tetramethyl-2-[(4R,8R)-4,8,12
-trimethyltridecyl]-3,4-dihydro-2H-chromen-6-ol
Urea -------- Diaminomethanal
Bilirubin -------- 3-[2-[(3-(2-carboxyethyl)-5-[(3-ethenyl-4-methyl-5-oxopyrrol-2-ylidene)methyl]-4-methyl-1H-pyrrol-2-yl]methyl)-5-[(4-ethenyl-3-methyl-5-oxo-pyrrol-2-ylidene)methyl]-4-methyl-1H-pyrrol-3-yl] propanoic acid
Nicotine -------- (S)-3-(1-Methyl-2-pyrrolidinyl)pyridine
Heroin -------- (5α,6α)-7,8-didehydro-4,5-epoxy-17-methylmorphinan-3,6-diol diacetate
Cocaine -------- methyl (1R,2R,3S,5S)-3-(benzoyloxy)-8-methyl-8-azabicyclo[3.2.1] octane-2-carboxylate
Picric acid -------- 2,4,6-trinitrophenol
TNT -------- 2-methyl-1,3,5-trinitrobenzene
Chloroform -------- Trichloromethane