This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1879 Excerpt: ... Give a short account of the natural occurrence and distribution of gold. 953. How is the quantity of gold in auriferous minerals, and in gold bullion ascertained? 954. Describe how gold is extracted (a) by placer mining, (6) by vein mining, (c) by hydraulic mining. 955. Give a short account of Planner's chlorination ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1879 Excerpt: ... Give a short account of the natural occurrence and distribution of gold. 953. How is the quantity of gold in auriferous minerals, and in gold bullion ascertained? 954. Describe how gold is extracted (a) by placer mining, (6) by vein mining, (c) by hydraulic mining. 955. Give a short account of Planner's chlorination process for the extraction of gold. 956. How is gold separated from silver and copper by "parting"? 957. How may gold be refined by means of chlorine? 958. How may a solution of gold be obtained? Name any reagents which precipitate metallic gold from the chloride. 959. What are the properties of gold? State the action of acids and alkalies on it, and how the oxides of gold are obtained. TETRADS. TIN. 960. From what ore is tin invariably prepared? Describe the various processes employed in its extraction. 961. How is tin-plate made? What is the composition of the following alloys of tin? (a) pewter, (6) solder, (c) gun-metal, (d) bronze, (e) speculum metal, (/) Britannia metal. 962. Express by equations the action of nitric, hydrochloric and sulphuric acids on tin. 963. How are each of the chlorides of tin prepared? Why does stannous chloride solution become turbid after exposure to air, and how may this be prevented? 964. What occurs when zinc is added to an acid solution of stannous chloride? What is the action of stannous chloride on mercuric chloride and on ferric chloride? 965. What is the constitution of stannic and of metastannic acids, and how is sodium stannate prepared? ALUMINIUM. 966. Name some of the most abundant minerals containing aluminium, and give the composition of cryolite, orthoclase, and wavellite. 967. By whom and when was the metal aluminium first prepared? What are its properties? 968. How is aluminium prepared...
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Add this copy of Questions on Chemistry to cart. $49.49, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2010 by Nabu Press.
