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19 Cards in this Set
- Front
- Back
definition of "polar molecule"
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the two ends of the molecule have opposite charges
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cohesion
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when hydrogen bonds hold a substance together
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adhesion
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the clinging of one substance to another
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surface tension
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measure of how difficult it is to strech or break the surface of a liquid
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kinetic energy
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the energy of motion
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temperature
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a measure of heat intesnity that represents the average kinetic energy of the molecules, regardless of volume
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calorie
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the amount of heat it takes to raise the temperature of 1 g of water by 1 degree C.
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specific heat
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the amount of heat that must be absorbed or loast for 1 g of that substance to change its temperature by 1 c.
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heat of vaporisation
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the quantity of heat a liquid must absorb for 1 g of it to be converted from the liquid to the gaseous state.
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evaporative cooling
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when liquid evaporates, the surface of the liquid that remains behind cools down.
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solution
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a liquid that is a completely homogeneous mixture of two or more substances
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solvent
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the dissolving agent of a solution
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solute
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the substance that is dissolved is the solute
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aqueous solution
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where water is the solvent
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hydration shell
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the sphere of water molecules around each dissolved ion
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hydrophilic
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a substance that has affinity for water
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colloid
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a stable suspension of fine particles in a liquid, because some molecules in cells are so large they don't dissolve
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hydrophobic
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a substance that repels water
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molecular mass
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the sum of the masses of all the atoms in the molecule
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