chm2045ch1 - Chapter 1 Introduction: Some Preliminaries...

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Chapter 1 Introduction:  Some Preliminaries Welcome to the Welcome to the World of World of Chemistry! Chemistry!
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Chemistry The study of  matter  – its nature, its structure  (how it is related to  atoms  and  molecules ),  properties, transformations, and its  interactions with energy Gold Gold Mercury Mercury
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The Scientific Method The general process of advancing  scientific knowledge through  e xperiments, o bservations, l aws,  h ypotheses, or t heories is called  the  Scientific Method - systematic approach to research
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The Scientific Method Experiment -  practical scientific    procedure. O bservation –  qualitative; quantitative   Hypothesis  –  tentative explanation .   Law –  concise statement; equation . Theory –  a tested explanation
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Matter It has mass  and occupies space
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Mass vs Weight Weight is the force that gravity exerts  on a  body or sample ( an apple that falls is pulled  down by the earth’s gravity ) weight = force = m X g    g: gravitational acceleration Mass is a  measurement  of the quantity of  matter in a body or sample
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Classification of Matter  Physical States  (3 states of matter, Br 2 )
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Solid (ch. 13) definite shape and volume made of particles (atoms, molecules, or ions)  held close together and rigidly in place reasonably well understood. Example: Example: Graphite Graphite — layer — layer structure of carbon structure of carbon atoms reflects atoms reflects physical properties. physical properties.
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Liquid (ch. 13) definite volume; indefinite shape made of particles (atoms, molecules, or ions)  held close together but allowed to move  relative to each other  fluid and may not fill a container completely   not well understood
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Gas (ch. 12) no definite volume or shape takes shape and volume of   container  made of particles (atoms or  molecules) separated from  each other by large  distances; move very fast  (high KE) fluid (variable shape; able to  flow) good theoretical  understanding (gas laws)
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Classification of Matter subcategories – based on composition and properties 
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Mixture combination of pure substances in  which the components retain their  identities (no reaction); variable  composition can be separated into simpler mixtures  and/or pure substances by     physical methods     
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inconsistent composition eg. pizza, carpet, beach sand, . .. Homogeneous Mixture
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This note was uploaded on 08/24/2008 for the course CHM 2045 taught by Professor Geiger during the Summer '08 term at University of Central Florida.

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chm2045ch1 - Chapter 1 Introduction: Some Preliminaries...

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