Gen Chem 2 Study Guide Exam 1.pdf - Gen Chem 2 Study Guide Exam 1 Chapter 11 Intermolecular forces and liquids Things to remember \u2022 Like charges repel

Gen Chem 2 Study Guide Exam 1.pdf - Gen Chem 2 Study Guide...

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Gen Chem 2 Study Guide Exam 1 Chapter 11 Intermolecular forces and liquids: Things to remember: Like charges repel (++ ,--). Unlike charges attract (+ -). For IMF look for attractions of regions of + charge & regions of – charge. Assume Hydrocarbons are non-polar “CH” Ion-Ion interactions: A fully pos. particle with a fully neg particle. Ion-Dipole Interactions: Ion with a polar molecule Important in aq solutions of ionic compounds. (hydration of ions) Greater the charge the smaller enthalpy of reaction Dipole-Dipole Forces: Polar Molecule with polar molecule Stronger IMF in polar molecules than in similar non-polar Hydrogen Bonding: Strong type of Dipole-Dipole Polar bond attached to hydrogen Usually F, O, or N IMPT. In proteins, nucleic acids Compounds that can H-Bond have higher boiling points than polar compounds that cannot not. Dipole-Induced Dipole : Polar molecule w/ Non-polar molecule Greater electron density on one side on the originally non-polar molecule- Tempor. Dipole “Induced” because presence of polar molecule caused it to occur London Dispersion: Occur between ALL molecules The only one present in non-polar molecules
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Liquids Things to remember: In liquids: molecules are in constant motion, appreciable IMFs, and molecules are close together. Viscosity: Measure of a liquid’s resistance to flow. Greater the viscosity the less readily the liquid flows In general, viscosity is greater with o Stronger IMF’s o Increasing molar mass for molecules with similar IMF’s o Decreasing temp. Surface tension: Molecules at the surface are more tightly packed together form “skin” on liquid. ST: A measure of the strength of this skin Measure by seeing how much force must be applied to break through the surface, or to cause a drop to lose its shape and form a film. Capillary Action: The movement of liquid up a thin tube Adhesive forces: forces of attraction between molecules of DIFFERENT materials. Cohesive forces: forces of attraction between molecules of the SAME material. Energetics: Vaporization or evaporation: process in which a substance in the liquid state becomes a gas Vaporization increases as the temperature increases. Vaporization is endothermic Liquid Vapor Greater the IMFs- the bigger Opposite of vaporization is condensation. Exothermic Vapor Liquid
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Vapor Pressure: The pressure exerted by a liquid’s vapor, when the liquid vapor equilibrium has been established.
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  • Solubility, Chemical polarity

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