A series of chemical problems with key for use in colleges and schools / by T.E. Thorpe. Rev. and enl. by W. Tate ; with a preface by H.E. Roscoe.

  • Thomas Edward Thorpe
Date:
1891
Catalogue details

Licence: Public Domain Mark

Credit: A series of chemical problems with key for use in colleges and schools / by T.E. Thorpe. Rev. and enl. by W. Tate ; with a preface by H.E. Roscoe. Source: Wellcome Collection.

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    56. A glass bulb of 120 c.c. cajiacity weighs I4'5 glams. Tlic relative density of the glass being 2‘48, calculate the thickness of the walls of the bulb. 57. Faraday calculated that the gold contained in 4 sovereigns could be drawn into a wire long enough to surround the'earth. The weight of a sovereign is 7'988 grains, and gi'66°/^ of this is pure gold, possessing a relative density of 19'3. Assuming that the length of a ipiadrant of the earth is 10,000,857 metres, find the thick- ness of the wire. 58. A piece of bcll-mctal, weighing 7'55o grams in air, \\ cighs 6‘6635 grams when weighed under water. Determine the percentage amount of cojiper and of tin in the piece on the assumption that no alteration in bulk has occurred in alloying the two metals. Relative density of copper = 8^93 ; of tin = 7^292. 59. A piece of cast iron, the relative density of which is known to be 7'2, is suspected to have internal cavities. Its weight is found to be 203*04 grams, and when sus- pended in water at 4° C. it is found to weigh I7r84grams. \Vhat is the total vohime of these cavities? 60. Find the relative density of calcium from the fol- lowing determination by ]3unsen :— Weight of empty bottle .... I3'640 grams. „ bottle filled with naphtha 2o'275 „ . „ „ partly „ ,, . 16-650 „ . „ „ ,, „ and calcium 19-150 „ . „ „ full of naphtha and „ 21-576 „ . Relative density of naphtha . . . 0-75S „ . 61. From the given data, calculate the relative densities of: — Weights of Sul)stancc in air. iJotlle ^ water. Bottle -f water and substance. (jiKirtz Heavy-spar . (Jalcile ^ . . Iron pyrites . 3'4-l5 grams. M‘2i6 ,, M o'795 M 75103 grains. 69‘002 ,, 8o'20I ,, 5'337 ». 77';.)S grams. 77-718 „ 101 '82.1 ,, 5'973 M