Science for Beginners a First book in General Science for Intermediate Schools
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In our eReader you can find the full English version of the book. Read Science for Beginners a First book in General Science for Intermediate Schools Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Science for Beginners a First book in General Science for Intermediate Schools
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To quickly assess the difficulty of the text, read a short excerpt:
To make a hard soap a soda lye (caustic soda, or NaOH) is used. This is purchased by the farmer's wife as " concentrated lye, " and the chemist keeps it in a purified form on his shelf.
In making hard soap the soda lye and fat are first boiled together, and when the contents of the kettle have become thoroughly united, a strong solution of common salt is added and the mixture is heated again. Then the boiling is stopped and the kettle is left standing for several hours. The contents of the kett...le separate into two portions, the upper consisting of soap and the lower containing the excess of salt, glycerin, and all im- purities. The soap thus produced is hard soap.
The glycerin is separated from the water and is used in medicine. When glycerin is treated with nitric acid it becomes nitroglycerin, used in making dynamite* and other explosives.
Free alkali in soap. In the making of soaps on a large scale, great care is taken to use the lye and the fat in exactly the right proportions, to avoid an excess of either fat or lye.
What to read after Science for Beginners a First book in General Science for Intermediate Schools?
You can find similar books in the "Read Also" column, or choose other free books by Delos Falls to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
To make a hard soap a soda lye (caustic soda, or NaOH) is used. This is purchased by the farmer's wife as " concentrated lye, " and the chemist keeps it in a purified form on his shelf.
In making hard soap the soda lye and fat are first boiled together, and when the contents of the kettle have become thoroughly united, a strong solution of common salt is added and the mixture is heated again. Then the boiling is stopped and the kettle is left standing for several hours. The contents of the kett...le separate into two portions, the upper consisting of soap and the lower containing the excess of salt, glycerin, and all im- purities. The soap thus produced is hard soap.
The glycerin is separated from the water and is used in medicine. When glycerin is treated with nitric acid it becomes nitroglycerin, used in making dynamite* and other explosives.
Free alkali in soap. In the making of soaps on a large scale, great care is taken to use the lye and the fat in exactly the right proportions, to avoid an excess of either fat or lye.
What to read after Science for Beginners a First book in General Science for Intermediate Schools?
You can find similar books in the "Read Also" column, or choose other free books by Delos Falls to read onlineMoreLess
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