Chem Lab 18b Test 1

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14 Terms

1

Vapor Pressure

pressure exerted by a vapor when it is in equilibrium with a liquid

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2

Evaporation Rate

rate at which temperature decreases when a liquid spontaneously evaporates

(spontaneous evaporation takes heat from surroundings)

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3

Volatile

substance that evaporates more rapidly

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4

coordinate covalent bond

bond between a metal cation and a ligand

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5

Coordination number

number of coordinate bonds a metal cation forms

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6

ligand

electron pair donors that bond to a metal cation to form coordinate covalent bonds

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7

strong electrolyte

solute present in solution almost exclusively as ions

fully dissociated in solution

solution is a good conductor of electricity

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8

weak electrolyte

partially ionized in solution

present in solution as both ions and molecules

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9

non-electrolyte

solute present in solution almost exclusively as molecules

solution does not conduct electric current

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10

freezing point depression

decrease in freezing temperature is proportional to the number of moles of solute added

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11

freezing/melting point

temperature at which the melting of a solid occurs at the same rate as the freezing of the liquid

when the rate of freezing is equal to the rate of melting (equilibrium)

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12

supercooling

when temperature keeps declining and passes freezing point due to molecules not lining up into crystalline arrangment

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13

colligative property

depends on ratio of solute and solvent particles (not on nature of solute)

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14

Affects conductivity

ions per mole (more ions = more conductivity)

complete dissociation in solution

size of ions (smaller ions = move electrons with less resistance = more condutivity)

concentration (increase concentration = increase conductivity)

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