Chem Lecture

Chem Lecture - Chem Lecture 14:05 Solid->...

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Unformatted text preview: Chem Lecture 14:05 Solid-> Crystalline-> long-range order Liquid-> glassey -> short range order Gas-> no order Pure substance: Elements cannot be chemically broken down into simpler substancs Compound- combinations of elements, with fixed proportions of elements, not separable by physical means Mixtures- no fixed proportion, combination of elements and compounds, separable by physical means Ex: sand, milk, solution Decanting, Distillation, Filtration, Centrifigation (physimeans) Zone melting-> alloys (mixtures of metals, melt at lower temperature than pure substances) Physical change-> changes in appearance not composition Chemical change-> change in composition Energy-> capacity to do work Work is force acting through a distance Force- F=ma(a_>) Kinetic energy KE=1/2 mv^2 Potential energy PE=mgh Units of Measurement Conversion Factors SI Meter-> Length 100 yd= 914m Kilogram-> Mass Second -> time Kelvin Unit-> temperature 0 K- all random molecular motion stops C= F-32/1.8 Peta 10^15 Tera 10^12 Giga 10^9 Mega 10^6 Kilo 10^3 Deci 10^-1 Centi 10^-2 Milli 10^-3 Micro 10^-6 Nano 10^-9 Pico 10^-12 Fento 10^-15 Alto 10^-18 Derived Units Volume -> m^3 (cm^3) Area -> m^2 Density= mass/volume Unitless measure-> a ration Percat(%) parts per hundred Parts per million (ppm) Parts per billion (ppb) Intensive properties-> independent of amount of substance present Extensive properties -> dependent on how much is present...
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This note was uploaded on 10/28/2011 for the course CHEM 10A taught by Professor Dolnick during the Spring '11 term at Brandeis.

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Chem Lecture - Chem Lecture 14:05 Solid->...

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