The constituents of gunpowder, when heated to a certain degree, enter into a number of new combinations, and are instantaneously converted into a variety of gases, the sudden expansion of which gives rise to the detonation.
Lead, when heatedin contact with the atmosphere, first becomes grey; if its temperature be then raised, it turns yellow, and a still stronger heat changes it to red.
When heated it evolves cyanogen, and runs into globules of metallic mercury.
Ammonio-phosphate of magnesium is very slightly soluble in pure water; when heated, it is resolved into pyrophosphate of magnesium, and is vitrified at a strong red heat.
The process of imbedding a substance in, or covering it with, some powder or composition capable of acting on it when heated, and in this state exposing it to a red heat.
When a few drops of a solution of citric acid are added to lime water, a clear liquid results, which, when heated, deposits a white powder, soluble in acids without effervescence.
Almost any organic substance can be used as a reducing agent, but it is well not to select one which melts, swells up, or gives off much water and gas when heated in the furnace.
When heated it swells up, loses its water, and fuses into a glass.
When heated it is yellowish; and, since it is volatile at a high temperature, it must not, in drying, be heated above its fusing point.
When heated in the atmosphere, it readily takes fire, and burns with a brownish yellow smoke which is destitute of smell.
When heated at the blowpipe, it melts with great readiness, and diffuses white vapours, possessing somewhat of a garlic smell.
At the same time, a solution of 1 part of common salt is made in 32 parts of distilled water, to which a little muriatic acid is added; and, when heated to nearly the boiling point, it is mixed with the mercurial solution.
When heated to redness, and permitted to cool gradually in the open air, they lose these peculiarities, and do not differ sensibly from common glass.
Three parts of sulphuric acid and one of chlorate of potassa, when heated, will give a saline mass, consisting of bisulphate of potassa, and perchlorate of potassa.
But pure ambergris, when heated, has a greasy feel, and appearance, and is soluble in hot ether and alcohol.
Flexner and Noguchi have shown that animal cells, when heated to 55° C.
Noc also observed that the venom of the same species of snake (Lachesis lanceolatus), when heated to 75° C.
Thus butter and wax will melt when heated; alcohol and gasoline will evaporate when exposed to the air.
When heated it undergoes a series of changes in which all the oxygen is finally set free, leaving a compound of potassium and chlorine called potassium chloride.
If the solution is then filtered and oxalate of ammonia added to the filtrate, a precipitate will be produced which, when heated to redness, leaves a residue of caustic lime possessing an alkaline reaction.
When once absorbed it retains the hydrogen at the ordinary temperature, and only parts with it when heated to a red heat.
These flakes, when heated in water, separate into two new bodies.
It is based upon the fact that mercuric fulminate, when heated with a large volume of water under high pressure, splits up into metallic mercury and non-explosive mercurial compounds of unknown composition.
When heated in the blowpipe alone it remains unaltered, that is, it is not fusible, and even with microcosmic salt it requires a considerably long and fierce heat before it yields and fuses, and acids do not act upon it.
Many sulphides, when heated in an ignition tube, volatilize and give a sublimate of sulphur in combination with the metallic portion of the substance.
When heated in an ignition tube carbon dioxide is evolved and the residue turns yellow.
When heated to redness in an ignition tube it yields a sublimate of metallic arsenic.
When heated, it fuses, and is decomposed with very powerful explosion, producing a vivid yellow flame.
When heated to redness with oxide of copper, it gave a mixture of nitrogen and carbonic acid, in the exact proportion of 1 volume of the former, to 5 of the latter.
The above list will hopefully provide you with a few useful examples demonstrating the appropriate usage of "when heated" in a variety of sentences. We hope that you will now be able to make sentences using this group of words.
