Dictionary of Chemistry [6th Ed.]
reached. The effect is analogous to the phenomenon of supercooling, i.e. the cooling of a liquid below its freezing point withou ...
blende A naturally occurring metal sulphide, e.g. zinc blende ZnS. Bloch’s theorem A theorem relat- ing to the *quantum mechanic ...
or absorbed radiation of frequency ν, the electron jumped from one orbit to another; the energy emitted or ab- sorbed by each ju ...
between collisions and (∂f/∂t)collis the rate of change of f(r,v,t) due to colli- sions. The Boltzmann equation can be used to c ...
borane(B 2 H 6 ): see formula. Other bo- ranes include B 4 H 10 , B 5 H 9 , B 5 H 11 , B 6 H 10 , and B 10 H 4. The larger boran ...
ity of molten borates to dissolve metal oxides. In solution it partially hydrolyses to boric acid and can thus act as a buffer. ...
of the metal oxide and boron oxide using carbon or aluminium. Chemi- cally, they are stable to nonoxidizing acids but are attack ...
conductor at room temperature. At least three crystalline forms are pos- sible; two are rhombohedral and the other tetragonal. T ...
with a wide range of structures. Borosilicate glasses are particularly important; the addition of boron to the silicate network ...
tion in London, he initiated X-ray dif- fraction studies of organic molecules. Bragg peakA peak in the scatter- ing pattern in X ...
yellowing. Fluorescent brighteners are compounds that absorb visible or ultraviolet radiation andÛuoresce in the blue region of ...
bromomethane (methyl bromide) A colourless volatile nonÛammable liquid, CH 3 Br; r.d. 1.68; m.p. –93°C; b.p. 3.56°C. It is a typ ...
Autocatalysis occurs as in the *Lotka–Volterra mechanism and the *oregonator. If the concentrations of A and B are maintained co ...
and sodium hydrogencarbonate. Basic buffers have a weak base and a salt of the base (to provide the conjugate acid). An example ...
The electrolytes are separated by a porous pot. The cell gives an e.m.f. of about 1.9 volts. burette A graduated glass tube with ...
89 B–Z reaction b called isobuteneor isobutylene. See alkenes. butenedioic acidEither of two isomers with the formula HCOOHC:CHC ...
cerium changes its oxidation state (Ce3+gives a magenta solution while Ce4+gives a blue solution). The B–Z reaction is an exampl ...
C cacodylAn oily liquid, (CH 3 ) 2 AsAs(CH 3 ) 2. It has a characteris- tic odour of garlick and is poisonous. Cacodyl was one o ...
the energy difference between the two states. Some caesium nuclei ab- sorb this radiation and are excited to the higher state. T ...
calcium carbonateA white solid, CaCO 3 , which is only sparingly solu- ble in water. Calcium carbonate decomposes on heating to ...
«
1
2
3
4
5
6
7
8
9
10
»
Free download pdf