CHM 1040 Lecture Notes - Lecture 3: Lightning, Viscosity, Pyrophoricity
17 Sep 2016
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Matter: anything that occupies space and has mass. Liquid: gas, plasma (stars, lightning, tail of a comet)- highly ionizable gas. Physical: without changing the chemical composition, observable, unique to a substance. Examples: solubility, viscosity, color, odor, brittle, boiling or freezing (you are just changing states), shredding paper, dissolving. Chemical: creates a new substance, behavior of matter. Examples: burning gas, pyrophoric, leaves turning colors in the fall, toxicity, burning wood, cooking an egg, digestion. Element: a substance that cannot be broken down into other substances by chemical means. Compound: are made up of two or more elements; can be broken down; same composition=same combination of atoms. Pure substance: always has the same composition throughout. Mixture: something that has variable composition; can be separated into pure substances. Homogenous- same composition throughout the substance; called a solution; you cannot tell the difference between elements in this type of mixture. Heterogeneous-you can tell the difference in elements; regions have different properties.
