WORD OF THE DAY
heating
They are of a reddish colour and usually crystallize well; on heating with concentrated acids are usually transformed into the purpureo-salts.
It is permanent in dry air, but in the finely divided state it rapidly combines with oxygen, the compact metal requiring a strong heating to bring about this combination.
A " Geyser " is a very convenient form of apparatus for heating a quantity of water in a short time.
Bright sunshine beat down through the bedroom window, heating her bedroll until she was drenched with sweat.
Cobalt monoxide, CoO, is prepared by heating the hydroxide or carbonate in a current of air, or by heating the oxide C0304 in a current of carbon dioxide.
By heating a mixture of cobalt oxalate and sal-ammoniac in air, it is obtained in the form of minute hard octahedra, which are not magnetic, and are only soluble in concentrated sulphuric acid.
With closed stoves much less heat is wasted, and consequ;ntly less fuel is burned, than with open grates, but they often cause an unpleasant sensation of dryness in the air, and the products of combustion also escape to some extent, rendering this method of heating not only unpleasant but sometimes even dangerous.
On evaporating this solution the hydrated salt CoI 2.6H 2 0 is obtained in hexagonal prisms. It behaves in an analogous manner to CoBr 2.6H 2 0 on heating.
Grimaux by heating one part of glyoxylic acid with two parts of urea for ten hours at ioo° C.: 2CO(NH 2) 2 + CH(OH) 2 Oooh = 3h 2 O + C4H6N403.