 # Chemistry Study Guide

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Chemistry Study Guide

Oct 2nd 1 hour Exam

Chapter 9- Thermodynamics

KE= Ð... mv2

w= F&#8710;x

w= force Ð§ distance

&#8729; A state function refers to a property of the system that depends only on its present state.

&#8729;Internal Energy = heat + work

&#8710;E = q + w

&#8729;Pressure = Force/Area = P = F/A

&#8729;Work= - external pressure Ð§ change in volume

w = - P&#8710;V

Enthalpy

H = E + PV

qp = &#8710;E + P&#8710;V

&#8710;H = qp

&#8710;H = H products - H reactants

Ideal Gas Law

PV = nRT

Energy "heat" = 3/2 R&#8710;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)

&#8710;E = Cv&#8710;T (per mole)

&#8710;E = nCv&#8710;T

"Heat" required = qp = nCp&#8710;T

= n (Cv + R) &#8710;T

= nCv&#8710;T + nR&#8710;T

(&#8710;E) (PV)

&#8710;H = &#8710;E + &#8710;(PV)

&#8710;H = &#8710;E + &#8710;(nRT) = &#8710;E + nR&#8710;T

&#8710;H = nCp&#8710;T

Energy released = energy absorbed

= m Ð§ Cp Ð§ &#8710;T

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

&#8710;E = q + w = q= qv

Bomb calorimeter =

&#8710;H = &#8710;TCp

&#8710;HÑ"reaction= &#8721;&#8710;HÑ"f (products) - &#8721;&#8710;HÑ"f (reactants)

Chapter 12

c = &#955;&#957;

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

&#8710;E = nhv or

&#8710;E = hv if n=1

Planck's constant = h= 6.626 Ð§ 10-34 J s

Ephoton = hv = hc/&#955;

KEelectron = Ð... mv2 = hv - hvo

E=mc2

De Broglie

&#955; = h/mv

PE = -Z e2/r

Z= atomic number

R= distance between nucleus

&#919;&#968; = &#917;&#968;

&#936;2 = 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 Ð§ 10-19 J

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