{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}


CHE113INTRO8 - ratios can be separated using the different...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
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
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

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...
View Full Document

{[ snackBarMessage ]}

Ask a homework question - tutors are online