Gen Chem II Exam 1 Study Guide
Gen Chem II Exam 1 Study Guide 603613
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This 2 page Study Guide was uploaded by Emmanuel Notetaker on Tuesday February 9, 2016. The Study Guide belongs to 603613 at University of Cincinnati taught by waddell, D in Winter 2016. Since its upload, it has received 116 views. For similar materials see Gen Chem II in Chemistry at University of Cincinnati.
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Date Created: 02/09/16
General Chemistry II Exam 1 Study Guide What state of matter is NOT considered to be a fluid state? - Solid Solids and liquids have ____ melting points and ____ boiling points Answer: High melting points and boiling points The heat of fusion ( Delta Hfus) is ____ than the the heat of vaporization (delta Hvap) Answer: Lower Hydrogen bonding --------- When H bonds directly to F,O or N A hot gas under a low pressure is _________ Answer: A good approximation of an ideal gas because it allows gas to get further apart minimizing attractive forces A cold gas under a high pressure is a ____________ Answer: Poor approximation of an ideal gas Melting point of benzene (C6H6) is 5.5 degrees Celsius and the heat of fusion at that temp is 9.87 kj/mol. How much heat would be required to melt 35.0 g od benzene ? Answer: 4.42 kJ Intermolecular forces in order from weakest to strongest Dispersion Dipole-dipole Hydrogen bonding Ion-dipole Liquids are usually regarded as __________________ Answer: Nearly incompressible The equilibrium of vapor pressure doesn't depend on ___________ Answer: the size of the vapor space LeChatelier's Principle states ____ Answer: the equilibrium responds in a direction that tries to restore the equilibrium According to Raoult's Law the rate of evaporation or condensation ___ Answer: depends on how many molecules there are in the liquid phase or in the gas phase Osmotic pressure is proportional to___ Answer: both temperature and molar concentration of the solute When osmosis occurs across a membrane separating a concentrated and a dilute solution__ Answer: a net transfer of solvent happens from the dilute solution to the concentrated solution Heat of solution in organic solvents are often__ Ans: Endothermic because the energy used in step 1 is bigger than the energy released in step 2 When melting or sublimation takes place ____ Answer: The temperature of the solid remains at the melting or sublimation point, and the arriving energy goes instead to do the work of pulling the molecules apart Forces between molecules in a solid are very strong, making molecules _______ _______ Answer: closely packed What is the heat of vaporization? Ans: the energy (heat) required to change a liquid at its boiling point to a gas (for 1 gram liquid) The natural log of the vapor pressure of a liquid is inversely proportional to its ______. this relationship is quantified in what? Answer: Temperature, Clausius - Clapeyron equation In molecular solids, weak intermolecular forces give rise to ______ melting points Answer: Low Molecular solids show poor _____ and ______ Answer: conductivity thermal and electrical In a solution, the ____ is dispersed uniformly throughout the ______ Answer: solute, solvent When solutions form, they favor increase in _____ that accompanies mixing Answer: entropy What factors affect Solubility ? 1. solute-solvent interactions (if they're similar intermolecular forces, they are more soluble) 2. Pressure (for gaseous solutions) 3. Temperature Henry's law equation S(g) = kP(g) solubility of gas = pressure of gas Four colligative properties 1. vapor pressure 2. elevation of boiling point 3. depression of freezing point 4. osmotic pressure A solute added to a solvent raises the boiling pressure because____ Answer:The solute particle lowers the vapor pressure, thus requiring a higher temperature of cause a boil
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