CHE 131 Lecture Notes - Lecture 1: Molar Mass, Unified Atomic Mass Unit, Alkali Metal

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CHE 131 Full Course Notes
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CHE 131 Full Course Notes
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Document Summary

Pure substances: can break up compounds into its constituents. Rust > oxidized ion, use carbon to reduce ion. Mixture can be uniform (homogenous) or heterogeneous (can"t mix well) An element is the simplest kind of material with unique physical and chemical properties. Variable combination of two or more pure substances (apple juice) No chemical reactions are needed to isolate the constituents in a mixture. Distillation - very uniform mixture and if domain is small and hard to separate using filtration. Product of chemical reaction has different properties from reactants. Nucleus is heavy and tiny - protons and neutrons (identical objects) Electron is light - situated at comparatively large distances around the nucleus. Mass # (a) -protons plus neutrons, roughly same mass. Atomic # (z) - number of protons (number of electrons determines chemical property element) Charge # (c)- atom can lose or gain electrons. Neutron is electrically neutral particle with a mass of 1. 008amu.

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