Chemistry 1027A/B Lecture Notes - Lecture 9: Ideal Gas Law, Molar Mass, Ideal Gas
15 Mar 2015
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Units (si: pressure = force per area = nm-2 = pa (pascal, 1 bar = 105 = 100 kpa, 1 atmosphere (atm) = 101. 33 kpa. States of matter: solid, liquid, gas. Substance can exist in only one state, or two or all three. Every substance (exception: helium) will form a solid. Atoms, molecules or ions are locked into fixed position. Forces which hold them in lattice structure can be : strong ionic solids, weak atomic solids made by inert gasses. Strength determines melting point: stronger interaction = higher melting point. Atoms, molecules always posses vibrational energy increase with temperature. Magnitude of vibrational modes overcomes attractive forces change into liquid. Attraction between atoms or molecules keeps them toughing. Species are free to move about within a sea of partners. Each atom/molecule takes up a little more volume due to increased motion. All solid substances are denser than its corresponding liquid solid will sink: exception: water.
