CHY 102 Lecture 3: chemistry101
9 Feb 2019
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30 particles essentially in a fixed arrangement cannot be compressed. Any substance can exist as: a solid, liquid, or gas. Molecule examples: (2 or more atoms stuck together) Elements if not mixed with other elements are considered pure substances and are composed of only one type of atom. examples: iron metal (fe), sulfur (s8 or sn), oxygen (o2), bromine (br2) Any characteristic that allows us to recognize a particular type of matter and to distinguish it from other types. H2o will always be two part h, 1 part o. A law that states that the elemental composition of a compound is always the same; also called the law of definite proportions. Homogeneous examples air, salt, water, metal alloys (brass) Heterogeneous examples potting soil, oil and water, iron and sulfur. Componenets of a mixture can be seperated by: a physical process. Mixtures that do not have the same composition, properties, and appearance throughout.
