Explain the mode of procuring the hydrated oxide of methyl-ethyl-amyl-phenyl ammonium-[S. S., pars. 977 to 980, and 517 to 552.] An unknown organic acid, not including any nitrogen, was combined with oxide of silver, and upon the salt thus formed the following experiments were made: I. 50 grains when ignited left 35.29 metallic silver. II. 30-6 of it when burned gave 3.8 carbonic acid and 0.2 water. From these data deduce the composition of the acid, on the hypothesis of its being monobasic.-[F. S., chap. XX.] 7.33 grains of a liquid, burned with oxide of copper, gave 14 66 of carbonic acid and 6 of water; the density of its vapour also was 3:04. From these data, and from the assumption that the condensation of the vapour is to 4 volumes, calculate the formula which represents the liquid. [F. S., chap. XX.; and S. S., pars. 131 to 136.] Write the formula which should be employed in determining, by Dumas's method, the specific gravity of a vapour.-S. S., pır. 130.] Give the formula of ethylamine urea, and explain the two processes by one or the other of which it may be made.-[S. S., pars. 1059 to 1063.] Mineral Chemistry. Write, according to the unitary system, the formula of common phosphate of soda.-[S. S., par. 872.] One hundred volumes of a mixture of marsh gas, hydrogen, carbonic oxide, and nitrogen, mixed with 150 volumes. of oxygen, were subjected, in a eudiometer, to the action of the electric spark, and the diminution of volume found to be 151.5 volumes. The residual gas, by exposure to potash, underwent a further diminution, amounting to 37 volumes. Lastly, the gas which remained was exploded by the spark, after mixture with at least twice its volume of hydrogen, and the reduction of volume which ensued was 22.5 volumes. From these data deduce the composition of the mixture.-[S. S., pars. 156 to 169.] 1862. If a represents in grains weight the per-centage of carbon in an organic compound, and v and v ́be the relative volumes of carbonic acid and nitrogen, obtained by burning it with oxide of copper, what will be the per-centage weight of the nitrogen?-[S. S., pars. 82 and 83, and Exercises 39 and 40.] Write the composition of alanine; describe the mode of making it; mention the compounds with which it is isomeric, and how it may be converted into lactic acid.— [S. S., par. 490.] What are the two reasons usually assigned for doubling the ordinary formula for oxide of ethyl, and the substances which occur in the same homologous series with it?— [S. S., pars. 384 to 391.] Explain the action of a solution of caustic potash on cyanide of ethyl and cyanate of oxide of ethyl.--[S. S., pars. 913 and 410.] Give the formula of propionic acid, and the different processes by which it may be artificially made.-[S. S., pars. 620, 629, 631, and 810.] Write the formula of ethylene alcohol, and explain how it may be obtained.-[S. S., pars. 734 to 738.] Write the empirical formula of glycerine, and its formula also on the supposition of its being a triatomic alcohol, and explain how it may be formed artificially.-[S. S., pars. 834 to 840.] What are the experiments, and what the calculations, which enable the chemist to assign the quantities of hydrogen, marsh gas, and carbonic oxide in a mixture of such gases ?-[S. S., pars. 156 to 169.] Sheerer analysed a mineral with the following results: Give its empirical formula.-[F. S., chap. XX., and S. S., pars. 255 to 259.] QUEEN'S COLLEGE, BELFAST. 1861. Faculty of Medicine. Explain by, symbols the reactions which take place when oxygen gas is prepared by the action of heat on Mn O, and K O, CIO,.-F. S., par. 516.] Describe the principal reactions of ozone, and the conditions under which it is formed.-[F. S., par. 516.] Give a particular description of the method of analysing atmospheric air by means of hydrogen gas.-[S. S., pars. 156 to 170.] What bodies have been found in atmospheric air besides oxygen, nitrogen, and carbonic acid?-[F. S., par. 520.] Give some account of hydrocyanic acid, its preparation, properties, and tests.-[F. S., par. 563.] What is the composition of gunpowder, and the principal products which are formed when it explodes ?—S. S., page 2, Exercise 9.] If C=12, H = 1, N=14, 0=16, Cl=35·5, K=39, what are the formulæ of the following bodies?—Water, hydrochloric acid, alcohol, ether, nitrate of potash. [S. S., pars. 113 to 122, and pages 248 to 251.] What are the four types to which Gerhardt refers organic compounds? Illustrate them by writing the formulæ, according to this view, of methyl, ethyl, marsh gas, wood spirit, alcohol, hydrochloric ether, and ethylamine.-[S. S., pars. 426 and 427, and pages 248 to 251.] If a given quantity of gas in the moist state, at the temperature of 10° C., and under a pressure of 28 inches, measure 150 cubic inches, what volume would it occupy in the dry state at 0° C., and under a pressure of 30 inches (tension of watery vapour at 10° C., 0:36 inches; coefficient of expansion for 1° C., 0·00366) ?—[S. S., pars. 5 to 83.] How is the latent heat of water determined ?-[S. S., par. 43.] Describe the method usually employed by chemists to take the densities of vapours, and state how it has been recently applied to the determination of vapour densities at very high temperatures.-[S. S., pars. 123 to 128.] What are the effects produced by an electrical current when traversing an electrolyte ?-[F. S., par. 345.] ENGINEERING SCHOLARSHIPS. If a given quantity of air measure 140 vol. at 10°C., and under a pressure of 297 inches, what volume will it occupy at 0° C., and under a pressure of 30 inches ?— [S. S., page 3, pars. 5 to 43.] How is the tension of a vapour determined ?-[S. S., pars. 66 to 73.] Give some account of the methods of preparing, and of the properties of ozone.-[F. S., par. 516.] Describe the different methods which are known of reducing the condensable gases to the liquid state.— [S. S., pars. 21 to 24.] Change, where necessary, the commonly received atomic weights of the following bodies, so that in every instance one volume of each body may correspond to one atom, viz. :-Hydrogen, oxygen, nitrogen, sulphur, chlo rine. [S. S., pars. 113 to 116.] Give a full account of the theory of volumes.-[S. S., pars. 84 to 122.] Describe the different modes of preparation, and the properties of sulphurous acid.-[F. S., par. 545.] Describe fully the tests of hydrocyanic acid; state also its composition, and the mode of preparing it.-[Q. A., par. 381, and F. S., par. 563.] Enumerate the more important metals, and arrange them in classes, according to their chemical properties.[F. S., chap. XXIII.] What are the compounds which arsenic forms with oxygen and sulphur? State their composition and describe their properties.-[Q. A., pars. 263, 264, and 285.] Mention the more important alkaloids, natural as well as artificial, which do not contain oxygen. Describe their general properties, and the sources from which they are derived. [S. S., pars. 972 to 983.] MEDICAL SCHOLARSHIPS. Practical Chemistry. Describe the methods of determining the density of a solid body, and state the precautions required in order to obtain accurate results.-[F. S., pars. 113 to 116.] What are the distinctive properties of the salts of potassa and soda?-[Q. A., pars. 112 and 114.] What are the blowpipe reactions of the salts of cobalt, magnesia, and copper?-[Q. A., pars. 108, 162, and 332.] THIRD YEAR ARTS AND FIRST YEAR MEDICINE AND ENGINEERING STUDENTS. 1862. Describe What are the different states of matter? them, and the conditions under which bodies pass from one state to another.-[F. S., pars. 3, 4, and 5.] In graduating a mercurial thermometer, what are the chief points requiring attention in order to secure an accurate instrument ? [S. S., pars. 1235 to 1254.] Describe the method of correcting a dry gas for temperature and pressure.-[S. S., pars. 12 to 15, and 42.] What are the circumstances which influence the boiling point of a liquid ?-[S. S., pars. 49 to 52.] Mention the principal gases which have been liquefied, and describe the methods by which their liquefaction has been effected.-[S. S., pars. 21 to 24.] Describe the method of determining the latent heat of steam, and state how it is affected by the temperature at which the vapour is formed.-[S. S., par. 58.] How is nitrogen gas prepared? and under what conditions will it combine with the following elements, viz. — Hydrogen, oxygen, and carbon ?-[F. S., pars. 519 and 209 to 211.] What is the supposed composition of ammonium? State also the reasons for assuming the possible existence of such a compound.-[S. S., pars. 398 to 401, and 417.] Give the composition, by weight and by volume, of the following compounds :-Water, ammonia, deutoxide of nitrogen, hydrochloric acid, carbonic oxide, marsh gas, |