A Text-book of Chemistry and Chemical Uranalysis for Nurses

Lea & Febiger, 1915 - 268 Seiten

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Seite 30 - To form some conception of the degree of coarse-grainedness indicated by this conclusion, imagine a rain drop, or a globe of glass as large as a pea, to be magnified up to the size of the earth, each constituent molecule being magnified in the same proportion. The magnified structure would be coarser grained than a heap of small shot, but probably less coarse grained than a heap of cricketballs.
Seite 63 - The calorie is the amount of heat necessary to raise the temperature of one gram of water one degree centigrade.
Seite 42 - Avogadro, in 1811, taking into account all of the facts known, advanced the hypothesis that — In equal volumes of all gases, at the same temperature and pressure, there is an equal number of ultimate parts or molecules. Avogadro extended his hypothesis to all gases, including even the elementary gases, and regarded the molecules of these substances as made up of atoms of the same kind, which had united with one another. This was a necessary consequence of his hypothesis. One...
Seite 259 - ... into B a small amount of ammonia which has escaped into the air space of A during the decomposition.
Seite 259 - The air current is now passed rapidly through the tubes until all the ammonia has been driven over into the acid in B. The time required for this depends on the speed of for the length of time allowed in analysis, and the ammonia is determined as described for urine analyses.
Seite 259 - ... is put into place. Twenty minutes at a room temperature of 15°, or fifteen minutes at 20° or above, are allowed for complete decomposition of urea. No harm is done if the solutions are allowed to stand longer, but the time must not be cut shorter unless more enzyme is used. While the enzyme is acting, one measures...
Seite 58 - Now, it has been already shown that water is composed of two volumes of hydrogen and one volume of oxygen ; and...
Seite 260 - Chemistry.) while a slow pump may require a half hour. The time required for complete aeration is determined for the particular vacuum used by trial, and a safe margin allowed in the determinations. When the aeration is finished the excess acid in B is titrated with -^ NaOH. The operations can be concisely summarized in the following diagrammatic form: !0.5 cc urine.
Seite 124 - Newton in 1666, who announced as the result of his experiments, that "rays of differently colored light have different degrees of refrangibility." He therefore concluded that white light is to be regarded as a mixture of an endless series of tints, among which the so-called "colors of the rainbow," violet, indigo, blue, green, yellow, orange and red, were selected by him as distinctive.
Seite 108 - Litmus milk should give a lavender color, not too deep, which turns red in the presence of acids and blue in the presence of alkalies.

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