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CO 2 + 4 H 2 → CH 4 + 2 H 2 O. It is probable that our current deposits of natural gas were formed in a similar way. [37] Certain types of bacteria can metabolize alkanes: they prefer even-numbered carbon chains as they are easier to degrade than odd-numbered chains. [38] Alkanes play a negligible role in higher organisms, with rare exception.
In most cases the formula representing a formula unit will also be an empirical formula, such as calcium carbonate (CaCO 3) or sodium chloride (NaCl), but it is not always the case. For example, the ionic compounds potassium persulfate ( K 2 S 2 O 8 ), mercury(I) nitrate Hg 2 (NO 3 ) 2 , and sodium peroxide Na 2 O 2 , have empirical formulas of ...
Methyl isobutyl ketone (MIBK, 4-methylpentan-2-one) is an organic compound with the condensed chemical formula (CH 3) 2 CHCH 2 C(O)CH 3. This ketone is a colourless liquid that is used as a solvent for gums, resins, paints, varnishes, lacquers, and nitrocellulose.
CH 3 CH 2 OH . Parentheses are used to indicate multiple identical groups, indicating attachment to the nearest non-hydrogen atom on the left when appearing within a formula, or to the atom on the right when appearing at the start of a formula: (CH 3) 2 CHOH or CH(CH 3) 2 OH . In all cases, all atoms are shown, including hydrogen atoms.
For example, the long-known sugar glucose is now systematically named 6-(hydroxymethyl)oxane-2,3,4,5-tetrol. Natural products and pharmaceuticals are also given simpler names, for example the mild pain-killer Naproxen is the more common name for the chemical compound (S)-6-methoxy-α-methyl-2-naphthaleneacetic acid.
2 – x Al x (H 2 Si 2 O 5)(OH) 4 ⋅nH 2 O (x < 1) [1] or (Cu, Al) 2 H 2 Si 2 O 5 (OH) 4 ⋅nH 2 O). [4] The structure of the mineral has been questioned, as a 2006 spectrographic study suggest material identified as chrysocolla may be a mixture of the copper hydroxide spertiniite and chalcedony. [6] Chrysocolla typically forms amorphously. [7]
The density of paper ranges from 250 kg/m 3 (16 lb/cu ft) for tissue paper to 1 500 kg/m 3 (94 lb/cu ft) for some specialty paper. Printing paper is about 800 kg/m 3 (50 lb/cu ft). [22] Paper may be classified into seven categories: [23] Printing papers of wide variety. Wrapping papers for the protection of goods and merchandise. This includes ...
Hydroxyethyl cellulose is a gelling and thickening agent derived from cellulose.It is widely used in cosmetics, cleaning solutions, and other household products. [1] ...