= Measurment = This is also the introduction chapter == Definitions == * Chemistry - Study of the compostion, structure, properties and reactions of matter * [[matter|Matter]] - Any material that occupies space and has mass * Composition - Identity and relative amounts of the components of matter. Described with "formulas" * Macroscopic - Large scale properties that may be determined directly * Microscopic - Small scale properties that must be determined by indirect methods. Usually on the atomic or molecular level == [[energy|Energy]] == Ability to do work see [[energy]] == Scientific Method == Way to thourghly understand the world that is testable == Accuracy vs Precision == * Accuracy - agreement of measured values with the "correct" values * Precision - how reproducable is the measurment == Error == * Systematic - Error is higher/lower than expectation, usually due to measurment device * Random error - Always present, makes values change slightly == [[signifigant_figures|Signifigant figures]] == See [[signifigant_figures|Signifigant figures]] == [[standard_prefixes|Standard Prefixes]] == See [[standard_prefixes|Standard Prefixes]] == [[density|Density]] == see [[density|Density]] [[index]]