Mercury and others

Usage examples of metals.

It oxidises most combustible substances with deflagration, and thereby converts sulphides into sulphates, arsenides into arsenates, and most metals into oxides.

Silver is found in the ores of other metals, such as fahlerz, which sometimes contains from two to ten per cent.

They had come hoping to begin with a society of small farms in some area where metals were plentiful, and to let their descendants gradually assemble the tools of a better civilization.

Where practicable, metals and alloys are best sampled by melting and granulating.

The gold and silver determinations, however, will compare very favourably with any of the other processes for the estimation of these metals in their ores.

The metals generally remain in the form of oxide, mixed with more or less sulphate and arsenate.

It is also used for dissolving metals only from ores which contain metallic oxides not desired in the solution.

It closely resembles chlorine and bromine in its properties, and can be used for dissolving metals without, at the same time, attacking any oxide which may be present.

The effect of this acid on solutions of the metals is to form sulphides.

If sulphuretted hydrogen is passed through an acid solution containing the metals till no further precipitation takes place, a precipitate will be formed containing sulphides insoluble in the acid.

Again, the metals precipitated in the acid solution form sulphides which may be divided into groups, the one consisting of those which are soluble, and the other of those which are not soluble, in alkalies.

The action of diluted sulphuric acid on metals closely resembles that of dilute hydrochloric acid.

It is used for separating metals from their solutions, and generally as a reducing agent.

But metals when free from pores have their density diminished when rolled, without annealing.

The presence of peroxides of the heavy metals is prejudicial, since they tend to increase the quantity of silver retained in the slag.