GChem term

[IdahoDoc]

Can some one explain Paramagnetism and diamagnetism to me please???

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[Tina324]

An atom or molecule is paramagnetic when it has unpaired electrons in its electron configuration. Due to these unpaired electrons, the atom or molecule can be weakly attracted to a magnetic field.

An atom or molecule is diamagnetic when it has no unpaired electrons in its electron configuration, causing it to repel magnetic fields.

Paramagnetism is stronger than diamagnetism.

I think that's all we need to know...i hope lol

Now, does anyone know what the heck gram equivalent weight is and how it related to normality??? i posted this q before, but no one answered me . Please, someone help...g chem has it out for me...i swear hehe

 

[HoangDDS]

The way I think about paramagentisim and dimaganetism is:

Paramaganetism has unpaired e-, so "pair me up"

Dimagantism has no unpaired e-s, so if you remember para="pair me up" you should know diamagnetism.

 

[appleonius]

Now, does anyone know what the heck gram equivalent weight is and how it related to normality??? i posted this q before, but no one answered me . Please, someone help...g chem has it out for me...i swear hehe

i hate GC as well.

here's what Kaplan has to say...

The normality (N) of a sol'n is equal to the # of gram equivalent weights (GEW) of solute per liter of sol'n. a GEW, or equivalent, is a measure of the reactive capacity of a molecule.

to calculate the normality of a sol'n we must first know for what purpose the sol'n is being used, b/c it is the concentration of the reactive species w/which we are concerned. Normality is unique among concentration units in that it is reaction dependent. For ex, a 1 molar sol'n of sulfuric acid would be 2 normal for acid-base reactions (b/c each mole of sulfuric acid provides 2 moles of H+ ions) but is only 1 normal for a sulfate precipitation reaction (b/c each molecule of sulfuric acid only provides 1 mole of sulfate ions).

Note: Normality is best thought of as "molarity of the stuff of interest" in the reaction.

HTH

edit: also, my mneumonic for remembering which is paired is in the name: DIamagnetic. Di = 2. like in DIatomic atoms.

 

[Xtian]

gram equivalent is the mass, in grams, of a compound's equivalent weight-- the amount of an element that reacts, or is involved in reaction with, 1 mole of electrons. a gram equivalent is the amount of a compound that is necessary to produce a given normality of a reactive species in a solution.

since gram equivalent weight or equivalent is a measure of the reactive capacity of a given molecule. Normality is the only concentration unit that is reaction dependent. Example:
1 M sulfuric acid (H2SO4) is 2 N for acid-base reactions because each mole of surfuric acid provides 2 moles of H+ ions. On the other hand, 1 M sulfuric acid is 1 N for sulfate precipitation, since 1 mole of sulfuric acid provides 1 mole of sulfate ions.


Now, does anyone know what the heck gram equivalent weight is and how it related to normality??? i posted this q before, but no one answered me . Please, someone help...g chem has it out for me...i swear hehe[/quote]