Elements of Chemistry: In which the Recent Discoveries in the Science are Included and Its Doctrines Familiarly Explained

Передня обкладинка
Robinson, Pratt, & Company, 1836 - 356 стор.
 

Інші видання - Показати все

Загальні терміни та фрази

Популярні уривки

Сторінка 2 - BBOWN, of the said district, hath deposited in this office the title of a book, the right whereof he claims as author, in the words following, to wit : " Sertorius : or, the Roman Patriot.
Сторінка 64 - This circumstance arises from the fact, that in forming water, these two gases combine in the proportion of two volumes of hydrogen to one of oxygen. Of course, therefore, when water is decomposed, the volume of oxygen is only half that of hydrogen. ) In this experiment, the poles of the battery must be of platina, or gold, otherwise, if they are made of iron, or other oxidable metal, the oxygen combines with the metal instead of being extricated and rising up the tube.
Сторінка 2 - An act for the encouragement of learning, by securing the copies of Maps, Charts, and Books, to the authors and proprietors of such copies, during the times therein mentioned,' and extending the benefits thereof to the arts of designing, engraving, and etching historical and other prints.
Сторінка 70 - The force of gravitation is directly as the quantity of matter, and inversely as the square of the distance.
Сторінка 341 - ... furnace. In these instances, the ash from the paper, the average weight of which is determined by previous experiments, must be subtracted from the weight of the heated mass. The tests commonly employed in ascertaining the acidity or alkalinity of liquids are litmus and turmeric paper. The former is made by digesting litmus, reduced to a fine powder, in a small quantity of water, and painting with it white paper which is free from alum. The...
Сторінка 269 - The sulphates, when heated to redness with charcoal, are ' decomposed and changed into sulphurets. The oxygen, both of the oxide and the acid of which the salt is composed, unites with the carbon, forming carbonic acid, while the sulphur and metal combine to form the new compound, the sulphuret. The sulphates in solution, are readily detected by muriate of baryta ; the muriate being decomposed by the sulphuric acid, an insoluble sulphate of baryta is formed, which falls to the bottom of the vessel...
Сторінка 337 - To the clear liquid containing iron and alumina, a considerable excess of a solution of pure potassa is added ; so as not only to throw down these oxides, but to dissolve the alumina. The peroxide of iron is then collected on a filter, edulcorated carefully until the washings cease to have an alkaline reaction, and is well dried on a sand bath. Of this hydrated peroxide, forty-nine parts contain forty of the anhydrous peroxide of iron. But the most accurate mode of determining its quantity is by...
Сторінка 334 - It consists in mixing 100 measures, or any convenient quantity of the gaseous mixture, with an equal volume of chlorine in a vessel covered with a piece of cloth or paper, so as to protect it from light ; and after an interval of about ten minutes, the excess of chlorine is removed by lime water or potassa. The loss experienced by the gas to be analyzed, indicates the exact quantity of olefiant gas which it had contained.
Сторінка 346 - ... the salt. This knowledge, on the contrary, is obtained directly by means of the scale of chemical equivalents. For example, on pushing up the slide until 100, marked upon it, is in a line with the name sulphate of potassa on the fixed part of the scale, the numbers opposite to the terms sulphuric acid and potassa, will give the precise quantity of each contained in 100 parts of the compound. In the original scale of Dr Wollaston...
Сторінка 332 - ... indications are very precise, it has the advantage of producing the effect gradually and without detonation. The most convenient mode of employing it with this intention is the following. A mixture of spongy platinum and pipe-clay, in the proportion of about three parts of the former to one of the latter, is made into a paste with water, and then rolled between the fingers into a globular form. In order to preserve the spongy texture of the platinum, a little...

Бібліографічна інформація