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Humboldt - CHEM 109 - Chemistry Notes 1/19 - Class Notes

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Schools > Humboldt State University > Chemistry > CHEM 109 > Humboldt - CHEM 109 - Chemistry Notes 1/19 - Class Notes

Humboldt - CHEM 109 - Chemistry Notes 1/19 - Class Notes

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background image Chemistry 109 classes of matter Law of constant composition Compounds that contain the same elements combined in the same proportions Water (H 2 O) Consists of two units of hydrogen and one unit of oxygen (1O:2H) Chemical formula­ the Notation of showing elements and compounds Ethanol chemical formula: C 2 H 6 O Sometimes the formula will have groups Fe(NO 3 ) 2   the NO 3  is grouped (indicated by the subscript) to mean that there  are more than one nitrate molecule bonded to the iron.  There are different structures to each molecule. Lewis dot structures Ball and stick Space filling­ using electron clouds in the models Chemical reactions (RXN) ­ transformation of one or more substances into other 
substances.
EX: hindenburg fell because it was a hydrogen blimp and the hydrogen 
bonded with oxygen in the air, the reaction ended with burst of energy.
Use the coefficients of the formula to indicate quantities of substances involved in
reaction (kilojoules) 
Stochentric equation  2H 2 +O 2 =2H 2 O+energy  Separating mixtures  Sometimes they can be separated by physical means Centrifugation ­ a process for separation particles by spinning quickly Electroforesis ­ a process for separating molecules based on their charge 
and size.
Filtration ­ using a medium to get rid of molecules Disatlation ­ a separation techniques in which the more volatile molecules
will evaporate and be contained in a different container
COAST Collect organized Key concepts Analyze Evaluate information Solve Calculate Think about it  Answer reasonable Density Ratio of the mass of an object instance to the volume of the objective substance  Density=Mass/Volume 1.5 properties of matter  A) Intensive; characteristics that are independent of the quality color, hardness, malleability, ductility, density

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School: Humboldt State University
Department: Chemistry
Course: General Chemistry
Professor: Kanika Sharma
Term: Fall 2015
Tags: General Chemistry
Name: Chemistry Notes 1/19
Description: These are the notes from Friday lecture.
Uploaded: 01/20/2018
2 Pages 43 Views 34 Unlocks
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