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Catechism of Chemistry: (English)

Catechism of Chemistry: (English)

          
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About the Book

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. 1876. Excerpt: ... water; but olive oil is procured from the pulpy part of the fruit of the olive-tree. These oils all consist of oxygen, hydrogen, and carbon. Wax is allied to the fixed oils. Q. What are volatile oils? A. Oils which are generally procured by distilling them out from the textures of the plant, in which they are contained, by heat. Some, however, such as those of the rind of oranges and lemons, being held in distinct vesicles, may be obtained by expression. The odour of plants is mainly owing to a volatile oil. Volatile oils are distinguished by their odour and hot taste. They do not leave the slightest stain on white paper if quite pure, but if the least quantity of fixed oil be mixed with them a greasy stain does remain. In this way, therefore, the purity of essential oils may be ascertained. Some of the volatile oils are heavier than water. They are all composed of oxygen, hydrogen, and carbon. Q. What are resins? A. The inspissated juices of certain kinds of plants, composed of carbon, oxygen, and hydrogen. Q. What are gum-resins? A. Inspissated juices which contain resin, gum, essential oils, and extractive matter. Q. What is amber? A. A substance dug out of the earth in Prussia, near the sea-coast, and which is thrown up by the sea on many shores. It is composed of resin, empyreumatic oil, and succinic acid, and is most probably a kind of resin formed long ages ago. Q. What are balsams? A. Vegetable substances which consist naturally of resin and benzoic acid. Q. How is starch obtained?. A. On the large scale it is obtained by steeping wheat either whole or bruised in cold water. After a time it swells and yields a milky juice by pressure, and is then put in coarse bags, which are placed in vats containing water, and is submitted to pressure as long as...


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Product Details
  • ISBN-13: 9781151600479
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 30
  • Series Title: English
  • Weight: 73 gr
  • ISBN-10: 1151600474
  • Publisher Date: 01 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Spine Width: 2 mm
  • Width: 189 mm

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