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### 23 Cards in this Set

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 Cohesion The building together of life molecules, often hydrogen bonds. Adhesion The attraction between different types of molecules. Surface Tension A test of how difficult it is to stretch or break the surface of a liquid. Water has a high surface tension becayse of the hydrogen bonding of surface molecules. Kinetic Energy The energy associated with the relative motion of objects. Moving matter can perform work by imparting motion to other matter. Heat The total amount of kinetic energy due to the random motion of atoms or molecules in a body of matter; also called thermal energy. Heat is energy in its most random form. Temperature A measure of the intensity of heat in degrees, reflecting the average kinetic energy of the molecules. Celsius Scale A temperature scale (C) equale to 5/9(F-32) that measures the freezing point of water at 0C and the boiling point of water at 100C. Calerie (cal) The amount of heat energy required to raise the temperature of 1 g of water by 1C, also the amount of heat energy that 1 g of water release when it cools by 1C. The calorie usually used to signify the energy content of food, is a kilocalerie. Kilocalerie (kcal) A thousand caleries; the amount of heat energy required to raise the temperature of 1 K of water by 1C. Specific heat The amounnt of heat that must be absorbed or lost for 1 g of a substance to change its temperature by 1C. Heat of vaporization The quantity of heat a liquid must absorb for 1 g of it to be converted from the liquid to the gaseous state. Evaporative Cooling The process in which the surface of an object becomes cooler during evaporation, owing to a change of the molecules with the greatest kinetic energy from the liquid tothe gaseous state. Solution A liquid that is a homeogeneous mixture of two or more substances. Solvent The dissolving agent of a solution. Water is the most common ___. Solute A substance that is dissolved in a solution. Aqueous Solution A solution in which water is the solvent. Hydration Shell The sphere of water molecules around a dissolved ion. Hydrophillic Having an affinity for water. Colliod A mixture made up of a liquid and particles (That because of their large size) remain suspended rather than dissolved in that liquid. Hydrophobic Having an aversion to water; tending to coalesce and form droplets in water. Molecular Mass the sum of the masses of all the atoms in a molecules; sometimes called molecular weight Mole (mol) The number of grams of a substance that equals its molecular weight in daltons and contains Avogadro's number of molecules. Molarity A common measure of solute concentration, referring to the number of moles of solute per liter of solution