An Elementary Study of ChemistryGinn, 1917 - 576 էջ |
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Common terms and phrases
action alcohol alloy aluminium ammonia ammonium antimony arsenic atomic weights barium boiling point bromine burning calcium hydroxide called carbon dioxide cent Chemical conduct coal color colorless combine combustion commercial composition compounds constituent contains copper crystals decomposed decomposition deposits dilute dissolved electric electrolysis elements energy flame following equation formula furnace gases glass gold H₂ H₂O H₂SO heat hydrochloric acid hydrogen and oxygen hydrogen chloride hydrogen sulfide insoluble ionization ions iron known laboratory liquid magnesium manganese manufacture melted mercury metals method mineral mixture molecules NaCl nickel nitrate nitric acid nitrogen obtained oxidizing agent oxygen percentage phosphate phosphorus platinum potassium chlorate powder precipitate prepared present pressure properties pure quantities reaction readily salts silicate silicon silver sodium carbonate sodium chloride sodium hydroxide soluble in water solution substance sugar sulfate sulfur dioxide sulfuric acid takes place temperature tion tube valence vapor volume white solid zinc
Սիրված հատվածներ
Էջ 61 - Avogadro's hypothesis that equal volumes of all gases under the same conditions of temperature and pressure contain the same number of molecules...
Էջ 84 - When any two elements, A and B, combine to form more than one compound, the weights of A which unite with any fixed weight of B bear the ratio of small whole numbers to each other.
Էջ 172 - ... is to be supposed therefore that the post-Homeric Greeks did not invent this cult, but brought it back from the comparative obscurity into which it had sunk under the rule of the Achaian nobility, who apparently were something which by contrast could almost be called free-thinkers. Its significance will be discussed in a later chapter ; for the present, it is enough briefly to describe it. A hero, in the technical sense which the word has in Greek for all writers from about the eighth to about...
Էջ 45 - With air or oxygen, hydrogen forms a highly explosive mixture, especially in the proportion of two volumes of hydrogen to one volume of oxygen.
Էջ 52 - Marriott, so named after its discoverers, is that the volume of a gas varies inversely as the pressure to which it is subjected.
Էջ 96 - H2SO4, shows that its molecule consists of two atoms of hydrogen, one of sulfur, and four of oxygen. 2. Molecular weights of compounds. Since each atom has its own weight, the sum of all the atoms in a molecule must be the weight of the molecule itself relative to oxygen taken as 16. The relative weight of the molecule of water is therefore (2 x 1.008) + 16 = 18.016. The relative weight of the molecule of sulfuric acid is (2 x 1.008) + 32.06 + (4 x 16) = 98.076. 3. Percentage composition of compounds....
Էջ 515 - Reduction of silver-bearing lead. The sulfide ores are first roasted until a part of the sulfide has been changed into the oxide and the sulfate. The air is then shut off and the heating continued, which brings about the reactions indicated in the following equations : 2 PbO + PbS — >- 3 Pb + SO2 PbSO4 + PbS — >- 2 Pb + 2 SO2 By reactions which are similar to the above, the ores bearing silver are reduced, the silver alloying with the lead. FIG. 177. Mining galenite in the Joplin region in Missouri...
Էջ 211 - It is often convenient to express the reaction in a single equation. This is readily done by combining equations (1) and (2) as given above. Before the equations are combined, however, they must be modified so as to express the fact that all the hydrogen represented as formed according to equation (1) reacts with the nitric acid according to equation (2). This may be done by multiplying the first equation by 3 and the second equation by 2. The two equations will then be as follows...