Chemistry section...Formulas?

[JohnKimx83]

Can we compile a list of must-know formulas for the Chemistry section? The Chem section is going to be the toughest for me, I just want to prepare myself with all the basics.

I'm sure there are a lot of Ka and pKa, molarity, molality, pressure, avogadro-related stuff, etc.

Can anyone add some more? Thanks!

 

[fifteen1]

The Ideal Gas Equation
PV=nRT

🙂

 

[CaliRx]

m1v1=m2v2
pH = pOH + pH = 14

 

[fifteen1]

Thermodynamic Relationships
*A few must know Thermo. relationships

Enthalpy
ΔH = ΔH(products) - ΔH(reactants)

Entropy
ΔS=q(rev)/T

Gibbs Free Energy
ΔG=ΔH-TΔS
ΔG=-RTlnK

Hope this helped in your review... 🙂

 

[chiko]

Molarity,M = moles of solute/L of solution

% yield = actual yield/theoretical yield * 100

weight % = solute weight/solution weight * 100

Normality,N = eq of solute / L of solution

V1 *C1 = v2 * C2

eq(acid) = eq(base)....so N1*V1 = N2*V2

 

[nerv12345]

ksp = [x(A)^x][y(B)^y]

[H+][A-] = ka
[HA]

[OH-][HA] = kb
[A-]

pka = -log ka

kw = [H+][OH-] = 10^14

 

[panzer]

So are we given these formulas or not?

 

[nerv12345]

hell no! we wish ha!

 

[Eviscerate]

Do we have to memorize the value of R for the PCAT?

 

[fifteen1]

Yes

 

[Eviscerate]

Since we're not allowed to use calculators, is it better to just round .0821 L x atm x mol^-1 x K^-1 to being .08, or 4/50?