Lecture Notes in Chemistry 1 (Harvard College) - Couverture rigide

Hodges, A L

 
9781340779122: Lecture Notes in Chemistry 1 (Harvard College)

Synopsis


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Présentation de l'éditeur

Theoretical Chemistry. An Element is a substance which cannot by any known process be resolved into simpler substances. AC ompound is a union of two or more substances, forming a new substance with new properties. AM ixture is a mechanical union of two or more substances, retaining the characteristic properties of each. Law of Definite Proportions: Each compound contains the same elements in the same.proportions. L(iw of Multiple Proportions: When two compounds consist of the same elements, the proportion in one is a simple multiple of the proportion in the other. Hydkic Peroxide, H302, is formed by uniting baric peroxide and hydrochloric acid according to the following reaction :B aG2 +2HC1 =B aCL +H2()2. Similarly we have the reaction of hydrochloric acid on baric oxide forming water: Ba() +2HC1 =B aCL, +H2(). These two reactions illustrate the law of multiple proportions. Hdric peroxide contains 2parts by weight of Hand 32 parts of O; while water contains 2of Hand 16 of (). Properties: hydric peroxide smells like chlorine and bleaches the skin. When concentrated as much as possible, it is of the consistency of syrup and freezes at 30 .(W henever in these notes degrees of temperature are mentioned, Centigrade is to be understood.) It is very unstable, readily giving up O, and is therefore a powerful oxidizer. Substances are attacked by the oxygen from it.
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