CHE 106 Lecture Notes - Lecture 1: Compressible Flow, Spectroscopy, Chemical Property
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Chemistry: the study of composition, structure, and properties of matter and energy and the changes that matter undergoes. Matter: anything that occupies space and has mass. Liquid: relatively incompressible, fixed volume but not a fixed shape. Gas: easily compressible fluid, a given quantity of gas will fit into a container of any size or shape. Spectroscopy : know what atoms or molecules are present in distant objects due to the light emitted. 2 principal ways to classify matter: physical state: solid, liquid, gas, chemical constitution: element, compound, mixture. Compounds: composed of two or more elements that are chemically combined. Law of definite proportions: a pure compound always contains definite or constant proportions of the elements by mass (fixed ratio) Mixtures: material that can be separated by physical means into two or more substances. The mixture has a variable composition (not a fixed ratio) Homogenous: physical properties are uniform throughout, called solutions. Filtration: solid substances are separated from liquids and solutions.
