Module 6 Portage Learning Chemistry Study Guide Graded A+

Molarity {Ans: the number of moles of solute present per liter of solution}Triple point {Ans: the temperature and pressure at which the solid, liquid and gas phases can coexist}Explain how and why the presence of a solute affects the freezing point of a solvent {Ans: The presence of a solute lowers the freezing point of a solvent by forcing solvent molecules away from the growing solid crystal. In order for the solvent molecules to reach the crystal and add themselves to the freezing solid, they must be slowed down to a lower kinetic energy by lowering the temperature}Weak electrolytes {Ans: solutes that only partially ionize}Crystalline solids {Ans: particles are arranged in one of several different orderly, repeating, geometric patterns}Vapor pressure {Ans: pressure exerted by vapor molecules above a liquid}Electrolytes {Ans: ionic or very polar compounds which dissolve to form solutions of ions which conduct an electric current}Explain how and why the presence of a solute affects the vapor pressure of a solvent {Ans: The presence of a solute lowers the vapor pressure of a solvent because some of the solute particles occupy the space near the surface of the liquid replacing some