Dictionary of Chemistry [6th Ed.]
bonate, and sodium perborate. When sprayed with the reagent, traces of blood (even old blood) emit a faint chemoluminescence. LU ...
M macromolecular crystal A crys- talline solid in which the atoms are all linked together by covalent bonds. Carbon (in diamond) ...
magnesiaSee magnesium oxide. magnesiteA white, colourless, or grey mineral form of *magnesium carbonate, MgCO 3 , crystallizing ...
MgCO 3 (s) + CO 2 (g) + H 2 O(l) → Mg(HCO 3 ) 2 (aq) On heating, this process is reversed. Magnesium hydrogencarbonate is one of ...
ning there is also a spin magnetic moment (see spin); atomic nuclei also have magnetic moments. magnetic quantum numberSee atom. ...
tion-element salts exhibit another form of magnetism called antiferro- magnetism. This occurs below a cer- tain temperature, cal ...
CuCO 3 .Cu(OH) 2. It is bright green and crystallizes in the monoclinic system but usually occurs as aggregates of Übres or in m ...
can be extracted by reduction of the oxide using magnesium (Kroll process) or aluminium (Gold- schmidt process). Often the ore i ...
approximation techniques or model systems. For some problems, such as the three-body problem in classical mechanics, it is possi ...
pounds, including ones that had not actually been synthesized. In 1925 The US Patent OfÜce ruled that such patents were valid. M ...
the rate is given by R = k[A]x[B]y where k is the *rate constant. The principle was introduced by C. M. Guldberg and P. Waage in ...
Matura diamondSee zircon. Maxwell, James Clerk (1831–79) British physicist, born in Edinburgh, who held academic posts at Ab- er ...
result is indicated by a cream precipi- tate. McLeod gaugeA vacuum pressure gauge, devised by Herbert McLeod (1841–1923), in whi ...
hertz; i.e. having a wavelength in the range 100–1000 metres. mega- Symbol M. A preÜx used in the metric system to denote one mi ...
Mendeleev’s law See periodic law. mendeleviumSymbol Md. A radio- active metallic transuranic element belonging to the *actinoids ...
ide solution is added to a solution of mercury(II) nitrate. Both forms de- compose to the elements at high temperature. The blac ...
with typical nonmetallic behaviour of forming negative ions. The *transi- tion elements (e.g. iron and copper) are harder substa ...
by this process. The metamictization is caused by alpha-particles and the recoil nuclei from radioactive disinte- gration. metap ...
methanationA method of manu- facturing methane from carbon monoxide or dioxide by high- pressure catalytic hydrogenation. It is ...
methylenedioxymethampheta- mine(MDMA)See ecstasy. methyl ethanoate (methyl ac- etate)A colourless volatile fragrant liquid, CH 3 ...
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