Chemistry Study Guide

Chemistry Study Guide

Oct 2nd 1 hour Exam

Chapter 9- Thermodynamics

KE= Ð... mv2

w= F∆x

w= force Ч distance

∙ A state function refers to a property of the system that depends only on its present state.

∙Internal Energy = heat + work

∆E = q + w

∙Pressure = Force/Area = P = F/A

∙Work= - external pressure Ч change in volume

w = - P∆V

Enthalpy

H = E + PV

qp = ∆E + P∆V

∆H = qp

∆H = H products - H reactants

Ideal Gas Law

PV = nRT

Energy "heat" = 3/2 R∆T

Cv = 3/2 R = "heat" required to change the temp of 1 mol of gas by 1K at constant

volume

Energy required = "heat" - energy needed - energy needed to do

to change the translational the PV work

energy

Cp = 3/2 + R = 5/2 R

= Cv + R = Cp

E = 3/2 RT (per mole)

∆E = Cv∆T (per mole)

∆E = nCv∆T

"Heat" required = qp = nCp∆T

= n (Cv + R) ∆T

= nCv∆T + nR∆T

(∆E) (PV)

∆H = ∆E + ∆(PV)

∆H = ∆E + ∆(nRT) = ∆E + nR∆T

∆H = nCp∆T

Energy released = energy absorbed

= m Ч Cp Ч ∆T

(mass)(specific heat)(change in Temperature)

∆E = q + w = q= qv

Bomb calorimeter =

∆H = ∆TCp

∆HÑ"reaction= ∑∆HÑ"f (products) - ∑∆HÑ"f (reactants)

Chapter 12

c = λν

speed of light (3.0E8 m ) = (wavelength)(frequency)

∆E = nhv or

∆E = hv if n=1

Planck's constant = h= 6.626 Ч 10-34 J s

Ephoton = hv = hc/λ

KEelectron = Ð... mv2 = hv - hvo

E=mc2

De Broglie

λ = h/mv

PE = -Z e2/r

Z= atomic number

R= distance between nucleus

Ηψ = Εψ

Ψ2 = Probability Density

n = energy level

l = shape

ml = orientation

ms = spin

Effective nuclear charge = Zeff = Zactual - effect of electron-electron repulsion

1 eV = 1.602 Ч 10-19 J

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