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Cem141
Exam 3
31
Chemistry
Undergraduate 1
11/19/2007
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Term
Bonding pairs: 2
 Definition
Linear (sp)
Term
Bonding Pairs: 3
 Definition
trigonal (sp2)
Term
bonding pairs: 4
 Definition
tetrahedral (sp3)
Term
bonding pairs: 5
 Definition
trigonal bipyramidal (sp3d)
Term
bonding pairs: 6
 Definition
octahedral (sp3d2)
Term
single bond
 Definition
sigma
Term
double bond
 Definition
sigma and pi bond
Term
triple bond 
 Definition
sigma, pi and pi bond
Term
Dalton's law of partial pressure
 Definition
if you have a mixture of gasses then the pressure exerted is the sum of all the gases
Term
Ptotal=
 Definition
Pa+Pb
Term
Xa+Xb=
 Definition
1
Term
Pa=
 Definition
(Xa)(Pt)
Term
three types of intermolecular forces
 Definition

1) Hydrogen Bonding

2) dipole dipole attractions

3) london dispersion forces 
Term
hydrogen bonding
 Definition
strong intermolecular force of attraction between F, O and/or N and a hydrogen atom
Term

when ∆H is positive

Definition
endothermic
Term
when ∆H is negative
 Definition
exothermic
Term
exothermic
 Definition
put together
Term
endothermic
 Definition
break up
Term
entropy
 Definition
the more ways you can organize a system the higher the entropy
Term

∆G=

 Definition

∆H-T∆S<0
Term

∆G (definition)

 Definition
free energy (can it happen?)
Term

∆S

 Definition

+ (more disorder)

- (less disorder) 
Term

∆H

Definition

+ (endothermic, break bonds)

- (exothermic (create bonds) 
Term

∆G

 Definition

+ (non-spontaneous)

- (spontaneous)  
Term
very volatile
 Definition
evaporate easily
Term
non-volatile
 Definition
will never evaporate
Term
addition of non volatile solute decreases
 Definition
total vapor pressure
Term
adding non volatile solute increase
 Definition
boiling point
Term

∆T=

 Definition
(K)(m)(i)
Term
adding nonvolatile solute decreases
 Definition
 melting point
Term
molality=
 Definition
(mols solute) / (kg solvent)
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