01:160:161 Lecture Notes - Lecture 1: Boiling Point, Atomic Number, Noble Gas
22 Jun 2017
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Document Summary
Atoms: the basic particles that compose ordinary matter. Molecules: atoms bind together in specific geometrical arrangements to form molecules. Properties of molecules depend on structure of molecules. Chemistry: the science that seeks to understand the properties of matter by studying the structure of the particles that compose it. Solid: composite particles fixed in place and only vibrate. Liquid: closely packed but move past one another, liquid flows and assume the shape of its container. Gas: particles widely spaced, compressible and a fluid. Can distinguish matter based on types of particles in it. Pure substance: made up of only one type of particle (one component) and its composition is invariant (does not vary from one sample to another) Only helium molecules, only water molecules, only sodium chloride molecules. Either element or a compound depending on whether or not it can be broken down into simpler substances. Element: substance that cannot be chemically broken down into simpler substances.
