# Equations for chem 111 test 1

 Heating solid, liquid, gas ΔH= s.h. * g * ΔT Water boiling ΔH= n * ΔHvap Water melting ΔH= n *ΔHfusion Molality m= mol solute/kg solvent Molarity M= n solute/ L solution Mass percent %= mass solute/mass solution * 100 Mole percent %= n solute/ n solution * 100 Mole fraction X= n solute/ n solution Vapor pressure lowering (Raoults law for nonvolatile solutions) P(solution)= X(solvent) * P(solvent) Freezing point depression ΔT= i * m * kf m is molality Boiling point elevation Δbp= i * m * kb What are the units for kf/kb? Celsius/molality Osmotic pressure II= i * M(solute) * RT M= molarity  R= 0.0821 How does vapor pressure change with increasing temperature? It increases How does viscosity change with increasing temperature? It decreases How does Boiling/melting point change with increasing temperature? They both increase How does surface tension change with increasing IMF? It increases, bc it requires a greater amount of energy to break the strong bonds between the molecules How does vapor pressure change with increasing IMF? Vapor pressure decreases with increasing IMF, because the stronger the IMF, the less the molecules want to escape into the vapor phase (also it takes a lot more heat to reach the vapor phase with stronger IMF) How do boiling/melting point change with increasing IMF? Both increase, bc the stronger attraction between the molecules means it takes more energy to break them apart How does viscosity change with increasing IMF? Increases, stronger IMF makes molecules less likely to flow How are the heats of fusion/vaporization changed with increasing IMF? Increase with increasing IMF, takes more energy to separate the bonds between molecules Cohesion Molecules adhesion to each other Adhesion Molecules tendency to attach to something other than themselves What is the R value in the CC equation? 8.314 What is the R value for everything BUT the CC equation? 0.0821 What is the relationship between gases and temperature in solubility? The higher the temperature, lower the solubility What is the relationship between gases and pressure in solubility? The higher the pressure, the more soluble What is solubility dependent on for solids? Temperature What are the four main colligative properties? Vapor pressure loweringBoiling point elevationFreezing point depressionOsmotic pressure What is osmotic pressure? When solvents move from a less concentrated area to a more concentrated area How does increasing temperature affect surface tension? Surface tension decreases Henry's Law Solubility of a gas= kh * Partial pressure M= atm/M * atm AuthorBagelHyrax ID354662 Card SetEquations for chem 111 test 1 DescriptionEquations and some theory for chem 111 test 1 Updated2021-02-24T18:06:18Z Show Answers