A Text-Book of Experimental Chemistry; (With Descriptive Notes) for Students of General Inorganic Chemistry

A Text-Book of Experimental Chemistry; (With Descriptive Notes) for Students of General Inorganic Chemistry

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1908 edition. Excerpt: ... (nitrogen peroxide), N,0, and N03. Heat about 8 grams of dry lead nitrate in a test tube. Note the color and odor of the gas evolved. The vapor may be condensed in a U-tube surrounded by a freezing mixture, or a portion of it may be conducted into a concentrated solution of NaOH contained in a test tube. If all of the gas is not absorbed by the solution, test the escaping gas for oxygen. Results? What is the name of the gas? Examine the substance which remains in the ignition tube. What is it? What is the name and formula of the evolved gas? Write equations for all reactions. Keep the NaOH solution for Exp. XVII. Label-it. (N,02) =--8,125 cal. (e) Nitrogen pentoxide (nitric anhydride), N205, does not exist in the free state. It is usually prepared by distilling a mixture of phosphorus pentoxide, P205, and nitric acid. It forms colorless, rhombic prisms which are so unstable that they explode violently when heated quickly. They dissolve readily in water with the disengagement of considerable heat, forming nitric acid, HN03. 2HNO3 + P205--N-Os + 2HP03. (N2,03--gas) =--12,000 cal. N20s + H20--2HN03. The series of oxides of nitrogen are an excellent illustration of what law of combination? State the law. Which of the oxides are colored? Colorless? (H, N,03--liq.) = 41,500 cal.; (H, N,03--Aq.) = 49,000 cal. From the foregoing equations it is readily seen that all of the oxides of nitrogen are endothermic compounds, i.e., the heat of formation from the elements is negative. It is obvious then, that the nitrogen oxides cannot be prepared from the elements without the addition of energy. (On account of this energy relation, the atmosphere is able to preserve its integrity as a mixture of nitrogen and oxygen gases, and this regardless of the heat.show more

Product details

  • Paperback | 160 pages
  • 189 x 246 x 9mm | 299g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236832671
  • 9781236832672