CHE113INTRO8

CHE113INTRO8 - ratios), can be separated using the...

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CHE113 Forensic Science Nicolas Canel Forensic Science Introduction Matter; Elements and Compounds -Substances –Elements - substances which cannot be decomposed into simpler substances (see periodic table) –Compounds - substances which can be separated into two or more elements -Elements –110 Known (periodic table to be revisited) –make up all matter and composed of “subatomic particles” –symbols used for abbreviations (from older or common names) -Compounds –Elements combined in a definite proportion by mass (law of definite proportion) – properties different than consititutent elements Matter; A Review -Mixtures; combinations of substances –Mixture - combination of two or more substances in which each retains its own chemical identity (and properties). Vary widely by composition (infinite possibilities of combining
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Unformatted text preview: ratios), can be separated using the different physical properties of the component substances. Homogeneous - appears the same throughout (solutions), liquid, gas and solid solutions are possible. Heterogeneous - mixtures which do not have the same (uniform) appearance throughout. The Functions of the Forensic Scientist-Examine the evidence-Perform the appropriate analysis or measurement-Render a conclusion based on evidence-Testify in court Uncertainty in Measurement-Precision and Accuracy Precision- how closely individual measurements agree Accuracy- how closely the measurements agree with the true value -Significant Figures All measurements are inaccurate intrinsically measured quantities are reported such that the last figure is uncertain...
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This note was uploaded on 03/02/2012 for the course CHE 113 taught by Professor Spencer during the Spring '08 term at Syracuse.

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