FA14_Lesson14

FA14_Lesson14 - What you should know from Lesson 13 Phase...

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Unformatted text preview: What you should know from Lesson 13 Phase Changes Know the names and definitions of the phase transitions, and the associated energy changes (endo. vs exo.). What is the definition and units of heat capacity, specific heat, and molar heat capacity? How do you interpret the heating curve of a pure substance? How do you calculate the total enthalpy change associated with a heating curve? Vapor pressure What is vapor pressure? How is vapor pressure affected by temperature and intermolecular forces? What is the normal boiling point? How does boiling point change as a function of external pressure? 1 Jensen Chem 110: Lesson 13 review What you should know from Lesson 13 Phase Diagram What is a phase diagram and how do you read it? What is unusual about the phase diagram of water? Be able to determine the changes that will occur to a pure substance as temperature or pressure (or both) are changed. How do you connect the heating curve to the phase diagram of a pure substance? Properties of Liquids What are the definitions of viscosity and surface tension? What are the differences between cohesive and adhesive forces? How are the properties of liquids related to the intermolecular forces and temperature? Given structures (formula) of molecules, be able to predict their relative properties based on intermolecular forces. 2 Jensen Chem 110: Lesson 13 review Lesson 14: Solutions Solution process (energy changes) Properties of Solutions (electrolytes) Concentration molarity M mass % % mole fraction X i ppm molality m Solubility Saturation supersaturation Factors that Affect Solubility temperature intermolecular interactions Pressure Colligative properties 3 Jensen Chem 110: Lesson 14 Solutions: start with definitions Homogeneous mixture : is uniformly mixed on a molecular level. Solute : the component of a mixture that is present in smaller quantity. Solvent : the component of a mixture that is present in greatest quantity. Aqueous solutions : water is the solvent 4 Jensen Chem 110: Lesson 14 Focus on the energy associated with the solution process 3. Form solute-solvent interactions 1. break solute-solute interactions 2. break solvent-solvent interactions 5 Jensen Chem 110: Lesson 14 When ionic solids dissolve in water, ion-dipole forces create a solvation sphere that leads to the dissolution of the salt. (Also called hydration.) Hydrated Na + and Cl ions 6 H 1 ___0: break _______________________ H 2 ___0: break _______________________ H 3 ___0: form ________________________ Jensen Chem 110: Lesson 14 The enthalpy change of the overall process depends on H for each of these steps....
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FA14_Lesson14 - What you should know from Lesson 13 Phase...

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