Introduction to Chemistry Part II

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Chemistry & Chemical Biology
CHEM 1211

Introduction to Chemistry Part II Matter Physical properties: attributes which distinguish one substance from another (think of the 5 senses) Examples: malleablility, ductility (ability to pull into wire, characteristic of metals), conductive, thermal conductivity (specific heat properties), taste, appearance, changing of state of matter Chemical properties: behavior a substance displays when its composition is subject to change Examples: iron reacts with oxygen to form rust, calcium carbonate neutralizes stomach acid CaCO3 (s) + 2H (aq)+  2H2O (l) + CO2 (g) + Ca2+ (aq) Phases of matter: solid, liquid, gas Solids displays fluid motion (fixed shape), will not conform to the shape of its container, comprised of molecules tightly packed, most condensed material Liquids will conform to the shape of its container, container is filled only to the extent of liquid’s own volume Gases will conform to the shape of container, will fill the entire container, gaseous state contains the highest molecular randomness Physical change: a change where a substance alters its physical form or phase; composition is NOT altered in physical state  occurs as temperature or pressure of substance is altered (i.e. ice cube changes) Melting/Fusion: a solid transforming into liquid Freezing: describes liquid transforming into solid Vaporization: liquid transform
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