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Lecture_8_Classification_of_matter - UNIT 1 LECTURE NOTES L...

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Updated: 9/16/2009 U N I T 1 L E C T U R E N O T E S LECTURE 8 Classification of matter (2.5 & 2.6) GENERAL CHEMISTRY Fall 2009
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Updated: 9/16/2009 2.5 Mixtures and Pure Substances I. Classification of Matter Two general categories of matter: pure substances and mixtures. A. Pure substances Definition: Have uniform composition (cannot be separated by physical means) Pure water is H 2 O; pure Gold (Au) consists of just Gold atoms * Percentage composition always the same from sample to sample * Pure substances melt and boil at a characteristic temperature Two types of pure substances: elements and compounds 1. Elements If a pure substance cannot be decomposed into something else, then the substance is an element . Students should memorize the second twenty element names and symbols. Element Name Symbol Element Name Symbol Scandium Sc Gallium Ga Titanium Ti Germanium Ge Vanadium V Arsenic As Chromium Cr Selenium Se Manganese Mn Bromine Br Iron Fe Krypton Kr Cobalt Co Rubidium Rb Nickel Ni Strontium Sr Copper Cu Yttrium Y Zinc Zn
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