A College Text-book of ChemistryH. Holt, 1901 - 689 էջ |
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Common terms and phrases
2HCl action aluminium ammonia ammonium antimony arsenic atomic weights barium base bismuth boiling bromine burning calcium called carbon dioxide charcoal chemical chloric acid chlorine color colorless combine with oxygen combustion composition compounds consists containing converted copper crystals decomposed decomposition deposited dilute dissolved easily elements equation EXPERIMENT flame flask formation formed formula gases glass grams H₂O H₂SO heat hydrochloric acid hydrogen and oxygen hydrogen sulphide insoluble iodine iron known liquid magnesium manganese mercury metals method mixture molecular weights molecules neutral nitrate nitric acid nitrogen obtained ordinary temperatures oxide oxygen ozone passed phosphate phosphoric acid phosphorus piece potassium chlorate potassium hydroxide precipitated pressure properties proportion reaction takes place readily represented salt shown in Fig silicon sodium chloride soluble in water solution specific gravity substances sulphate sulphur dioxide sulphuric acid takes fire test-tube tion treated trichloride trioxide tube valence vapor vessel volume zinc он
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Էջ 647 - ... resistance to the action of reagents. An alloy of 90 per cent platinum and 10 per cent iridium has been adopted by the French Government as the best material from which to make normal meters. This alloy...
Էջ 14 - These cases illustrate what is known as the law of multiple proportions, which may be stated thus : If two elements, A and B, form several compounds with each other, and we consider any fixed amount of A, then the different amounts of B which combine with this fixed amount of A bear a simple ratio to each other.
Էջ 113 - Pig. 41) in a bath of water, oil, or paraffin, according to the boiling-point of the liquid. The bath is heated 30-40° above the boiling-point of the liquid under examination. The air is thus driven out and the balloon is filled with the vapor. When vapor no longer escapes, the point of the stem is closed by melting it with a mouth blow-pipe. The balloon is then cleaned, dried, and weighed. The temperature of the bath and the height of the barometer are observed at the time the balloon is closed....
Էջ 331 - As,O, ; as, however, most of its reactions can be more conveniently expressed by the aid of the simpler formula, the latter is commonly used. Arsenic trioxide has a weak, disagreeable, sweet taste, .and is an active poison. A dose of from two to three grains is sufficient to cause death unless it is ejected by vomiting, or rendered harmless by being converted into an insoluble compound. It is possible, by beginning with •small doses, and gradually increasing them, to accustom the human body to...
Էջ 35 - Liquid oxygen is a pale steelblue transparent and very mobile liquid which boils at — 181°.4at ordinary pressure. "When the pressure is reduced or removed, evaporation takes place so rapidly that a part of the oxygen is often frozen to a white solid. Chemical Properties. — At ordinary temperatures oxygen does not act readily upon most other things, as can be clearly shown by putting a variety of substances in the gas without heating them. If they are left for a considerable time some evidence...
Էջ 423 - ... the quantity of heat required to raise the temperature of the same weight of water one degree is called the specific heat of the substance.
Էջ 103 - It is further supposed by chemists that at a given pressure and temperature equal volumes of all gases, whether simple or compound, contain the same number of molecules. Thus, a cubic foot of hydrogen, a cubic foot of air, a cubic foot of steam, all contain the same number of molecules at the same temperature and pressure. Suppose...
Էջ 137 - By mixing equal volumes of hydrogen and chlorine and causing them to combine it has been found that 1 volume of hydrogen combines with 1 volume of chlorine to form 2 volumes of hydrochloric acid.
Էջ 102 - Investigation pf certain phenomena of light, of electricity, of liquid films and the conduct of gases has led physicists to the conclusion that matter is not continuous, but made up of small particles, which are called molecules. A gaseous molecule is defined as " that minute portion of a substance which moves about as a whole, so that its parts, if it has any, do not part company during the motion of agitation of the gas.
Էջ 561 - At different temperatures zinc has markedly different properties. At ordinary temperatures it is quite brittle; at 100°-150° it can be rolled out in sheets, but above 200° it becomes brittle again. It melts at 433°, and boils at 1040°. When heated in the air it takes fire, and burns with a bluish flame, forming zinc oxide.