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Chem 1212k Week 1 Notes

by: Brooke Martin

Chem 1212k Week 1 Notes Chem 2211K

Marketplace > Georgia State University > Arts > Chem 2211K > Chem 1212k Week 1 Notes
Brooke Martin
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About this Document

week one of notes, chapter 11
Introduction to Chemistry
Dr. Jie Jiang
Class Notes
Chemistry, Chem, 1212k, GSU, georgia state university




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This 3 page Class Notes was uploaded by Brooke Martin on Wednesday January 20, 2016. The Class Notes belongs to Chem 2211K at Georgia State University taught by Dr. Jie Jiang in Fall 2015. Since its upload, it has received 99 views. For similar materials see Introduction to Chemistry in Arts at Georgia State University.


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Date Created: 01/20/16
Brooke Martin Chem 1212k Jiang January 18, 2016 Week 1 notes CHAPTER 11 Inter molecular forces: hold solids and liquids together; exist between all molecules and atoms Liquids Low intermolecular forces Thermal energy = molecules move freely Solids Low intermolecular forces Molecules locked into position; vibrating Gasses High intermolecular forces Compressible Changes in state: due to change in pressure or temperature Dispersion forces: Result of movement of electrons; slightly polar moments (aka dipole) Properties: All molecules have dispersion forces Magnitude – how easily the electron can polarize/move in response to a single dipole Depends on electron cloud size ↑ Electron cloud = ↑ dispersion force =electrons less tight = polarize easily ↑ Dispersion force = ↑ molar mass Dipole – Dipole forces: Exist in all polar molecules Properties Permanent dipole – separation of charge; always dipole Miscibility – ability to mix without separating in to two states Hydrogen Bonding Super dipole – dipole H – (F, O, or N) small electronegative atoms 2-5% as strong as the typical covalent bond H2O has two H bonds; water is a liquid at room temp; high boiling point Ion – dipole force Ionic compound is mixed with a polar compound Strongest force Determines solubility INTERMOLECULAR FORCES IN ACTION (11.4) Surface tension Liquids minimize surface area; energy required to increase surface area by a unit amount ↑ surface tension = ↑ intermolecular forces Viscosity Resistance of a liquid to flow (ex. Honey) Unit: poise (P) ↑ Viscosity = ↑ intermolecular forces = ↑ molar mass = ↑length of chain Capillary action Ability of a liquid to flow against gravity (ex. Trees drawing water from soil) Result of two forces Cohesive: cause liquid to stay together Adhesive: liquid spread out over the surface of the tube Thinner tube = higher rise Adhesive > cohesive = capillary action Adhesive < cohesive = no action VAPORIZATION & VAPOR PRESSURE (11.5) Vaporization Liquid → gas (endothermic) Condensation = opposite (exothermic) ↑ temperature = ↑ vaporization = ↑ surface area Volatile = vaporizes easily SUBLIMATION & FUSION Sublimation Solid → gas (endothermic) Disposition = opposite (exothermic) Fusion Solid → liquid (endothermic) Freezing = opposite (exothermic)


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