Chem Equations Flashcards by Madi Hart

Energy of a quantum?

E=hf, where h=planck’s constant=6.626e-34 J/s; and f=freq of radiation

How well did you know this?

Not at all

Perfectly

angular momentum?

L=mvr

How well did you know this?

Not at all

Perfectly

kinetic energy?

K=mv^2/2

How well did you know this?

Not at all

Perfectly

angular momentum using classical physics and planck’s constant

L=nh/2pi; where n=principal quantum number, h=planck’s constant=6.626e-34

How well did you know this?

Not at all

Perfectly

energy of an electron

E=-Ry/n^2; where Ry=Rydberg constant=2.18e-18 J/electron

How well did you know this?

Not at all

Perfectly

electromagnetic radiation of a photon emitted by an excited electron

Ep=hc/lambda
where h=planck’s constant=6.626e-34, c=velocity of light in a vacuum=3.00e8 m/s, lambda is the wavelength of the radiation

How well did you know this?

Not at all

Perfectly

Lyman series

Final E level=1=>emits UV light

How well did you know this?

Not at all

Perfectly

Balmer series

Final E level= 2 => emits UV and visible light

How well did you know this?

Not at all

Perfectly

Paschen series

Final E level= 3 => emits IR light

How well did you know this?

Not at all

Perfectly

energy of an electron

Ee=Ry(1/ni^2-1/nf^2)

How well did you know this?

Not at all

Perfectly

Energy of electron and photon?? lol idk

E=hc/lambda= -Ry(1/ni^2-1/nf^2)

How well did you know this?

Not at all

Perfectly

max number of electrons in an electron shell

2n^2

How well did you know this?

Not at all

Perfectly

number of e-s within a subshell

4l+2

How well did you know this?

Not at all

Perfectly

formal charge

V-1/2Nbonding-Nnonbonding

where V=number of VEs, or V-#sticks-#dots

How well did you know this?

Not at all

Perfectly

dipole moment of a polar molecule

mu=qr, where q= charge mag; r=distance bw two partial charges

How well did you know this?

Not at all

Perfectly

moles exchanged in a rxn

M^n+ne- –> M

How well did you know this?

Not at all

Perfectly

charge of an electron

1.6e-19 C

How well did you know this?

Not at all

Perfectly

charge of one moles of e

1.6e-19 x 6.02e23 = 96 487 C/mol e-

How well did you know this?

Not at all

Perfectly

1 Farad

96 487 C or J/V; ~ 10e5

How well did you know this?

Not at all

Perfectly

Boiling point elevation

extent to which a bp of a sol’n is raised relative to that on the pure solvent;
dTb=i Kb m; i = van’t Hoff factor;

How well did you know this?

Not at all

Perfectly

osmotic pressure

pi= i M R T; i= van’t Hoff factor; M= molarity; R=ideal gas constant; T= temp in K

How well did you know this?

Not at all

Perfectly

Raoult’s law

Pa=XaPa and Pb= XbPb; applies only when the attraction between a & b is equal to the attraction between a & a and b and b

How well did you know this?

Not at all

Perfectly

atm to Pa to torr to mmHg

1 atm = 10e5 Pa= 760 torr = 760 mmHg

How well did you know this?

Not at all

Perfectly

Boyle’s law

P1V1=P2V2

How well did you know this?

Not at all

Perfectly

Charles law

V1/T1=V2/T2

Avagadro's principle

n1/V1=n2/V2

ideal gas law

PV=nRT

1 mole gas occupies 22.4L under STP (273 K, 1 atm)

moles transferred by electrochem cel

i t = n F where t= time is secs n= # of moles of e-s F = faraday constant (10e5 C)

electromotive force

E*cell = E*red + E* ox

Gibbs free e of a cell

dG= -n F E*cell

nFE*cell = RTlnKeq

Nernst eq

for non-standard conditions; Ecell= E*cell- (RT/nF)(ln Q), where Q = ([C]^c[D]^d)/([A]^a[B]^b)

rate of reaction

-[dR]/t or [dP]/t

rate for forward, irreversible rxn aA+bB--> cC+dD

rate= k [A]^x[B]^y

overall rxn rate

sum of orders (x+y)

0-order rxn rate, conc A at time t, half life

rate = k, conc A = [A]=[A0]-(k0)(t), t1/2 = 1/2*A0/k0

1st-order rxn rate, conc A at time t, half life

rate = k[A] or k[B]; conc a time t = [At] = [A0] e^(-kt); t1/2= ln2/l = 0.693/k

2nd order RR

k[A]^2, k[B]^2 or k[A][B]

collision theory reaction rate:

rate = fZ, where Z is total # of collisions, f is the fraction of effective collisions

heat absorbed or released in a rxn

q=mcT

change in heat (enthalpy) at constant pressure

heat rxn= Hprod-Hreact

standard heat of formation is for ONE MOLE of product--product must have ONE in front of it in a rxn--even if there are fractions

standard heat of rxn

sum of Hfprods - sum of Hfreactants

standard entropy change of a rxn

sum of Sprod-sum of Sreactants

entropy in the universe

must remain constant-- Suni= Ssystem+Ssurroundings > 0

Free E of a system

dG= H-TS, where T - abs temp in Kelvin

standard free e

stGrxn= sum of Gfprods-sum of Gf react at 25 C, 1 atm

G with Keq

G=-RTlnKeq

G rxn not at eq

G= stG + RTlnQ, where stG= -RTlnKeq

Keq

Keq= [C]^c[D]^d/[A]^a[B]^b

le chatelier's principle

increase in pressure-->favours side of rxn with fewest moles of gas cules; increase in volume--> eq shifts so more prod of substances with highest amount of moles

Ion product

for rxn AmBn--> mA(aq) + nB (aq), | Qsp= [A]^m[B]^n

solubility prod constant

Ksp = [A]^m[B]^n, in a saturated sol'n; varies with temp,

describe the relationships bw Ksp and Qsp

if a salt's: Ksp=Qsp, system is at equil, saturated Ksp>Qsp, system is undersat Ksp

conv of cal to joule

1 cal = 4.184 J

specific heat gained or lost by a substance

Q=mcT=mc(Tf-Ti)

specific heat capacity for water

c= 1 cal/g K = 1cal/g C = 4.184 j/g K

heat of transformation

Q=m Hl where Hl is the latent heat--i.e. amount of heat needed for 1 kg of substance to change phase-->temp remains constant during phase changes

heat of fusion

Hf--> for solid liquid

heat of vaporization

Hv: for liquid gas

freezing point depression

dTf= i Kp M where Kp=proportionality constant for a given solvent; m=molality (mol solute/ kg solvent); i -van't Hoff factor-->accounts for number of particles that dissociate from original 'cule

dalton's law

partial pressure's -- Pt= Pa + Pb + Pc... + Pz

Partial p of a gas

Pa= Ptot Xa

average KE of gas?

3/2 kT where k = boltzmann constant, T in kelvin

rate pf gas diffusion

r1/r2= sqrt (MM2/MM1)-- under isothermal and isobaric conditions

[H][OH] = 1e-14

percent ionization

ionized acid conc @eq/ initial conc of acid x 100

review nuclear decay

Chem Equations Flashcards

(69 cards)