Solutions – Chemistry Flashcard

solute definition

the substance being DISSOLVED in the solution 

(aka the sugar in a sugar-water solution)

solvent def

the substance that is doing the dissolving

(aka the WATER in a sugar-water situation)

Solute vs Solvent:  If the solvent &solute are in different phases, Who remains in the same phase after mixing?
the solvent
Solute vs Solvent:  If the solvent &solute are in same phases, Who remains in the greater magnitude after mixing?
the solvent

solvation

1. aka

 

2.def


1. dissolution

2.is the electrostatic interaction btwn the solute & solvent molecules

when the new interactions are stronger than the original ones, solvation is

1.( exothermic/endothermic)

2. process is favored at (high/low temps)

1. exothermic

2. low temp

 

 

* remember exothermic releases heat and does not need heat

when the new interactions are weaker than the original ones, solvation is

1.( exothermic/endothermic)

2. process is favored at (high/low temps)

1.endothermic

2. high temps

an ideal solution has an enthaply (H) of dissolution equal to (#)?
zero
why are solid ionic compounds bad conductors of electricity?
their charged particles are rigidly set in place by the lattice arrangment that allows the compond to be in fact a solid.
why are aqueous ionic compounds good conductors of electricity?
their lattice formation is disturbed by the ion-dipole interactions btwn the ion components and the water molecules
what is raoult’s law

ideal behavior in a solution occurs when solute-solute

solvent-solvent

solventsolute

interactions are VERY SIMILAR.

 

(aka the compounds in the solution do not repel each other)

osomosis of water:

water moves toward the _____

solute
the entropy change  that occurs when a solution is formed has a postive or negative value?

a negative value

 

entrophy is decreased bc the ordering of the molecules is increased.

what factors causes the entropy change  that occurs when a solution is formed has  to a MORE negative value?

higher charge denisty

(aka 2+ vs -1)

(or if comparing identical charges: the smaller size)

what is the effect on the vapor pressure when two components that are against Raoult’s Law combine?

vapor pressure increases,

they are having stronger

solute-solute

solvent-solvent interactions

than solute-solvent interactions

=

they are repelling, and want to evaporate

 

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