describe the appearance of_ .coal .petroleum .coal tar .coke
Answers
Hi pal,
coal is a solid dark substance.
Petroleum is a liquid black substance.
Coal tar is a powedery sticky black substace.
Coke is a black solid substace.
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Appearence of Coal: Coal is a combustible black or brownish-black sedimentary rock, formed as rock strata called coal seams. Coal is mostly carbon with variable amounts of other elements; chiefly hydrogen, sulfur, oxygen, and nitrogen.
The Appearance of Petroleum: It is usually black or dark brown (although it may be yellowish, reddish, or even greenish). In the reservoir, it is usually found in association with natural gas, which being lighter forms a "gas cap" over the petroleum, and saline water which, being heavier than most forms of crude oil, generally sinks beneath it.
The Appearance of Coal tar: Coal tar is a thick dark liquid which is a by-product of the production of coke and coal gas from coal. It has both medical and industrial uses.
The appearance of Coke: Coke is a grey, hard, and porous fuel with high carbon content and few impurities, made by heating coal or oil in the absence of air—a destructive distillation process.