CHEM 1300 Lecture Notes - Lecture 2: Bohr Model, International System Of Units
26 Jun 2018
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Lecture 2
Continued kinetic energy
●Radiant or light
●Thermal or heat
oNot the same as temperature
oDirectly proportional (positively correlated)
●Ekinetic= 0.5(mv)2 used for particles
om=mass(kg)
ov=speed in ms-1
●Eavg=3RT/2NA
oR=gas constant
oT=temperature
oNA=Avogadro’s number
Potential Energy
●Stored in the chemicals position and structure
●Chemical bonds between molecules
●Energy = E=mc2
om=mass
oc=speed of light constant
●electrical charges
oE=kq1q2/r (Coulomb’s law)
▪r=distance between particle centres
▪q1q2=charges
▪k=constant
Law of conservation of energy (1st law of thermodynamics)
●energy cannot be destroyed or created
●it can only be transformed and moved through substances from one place to another
otransformation of energy from one type to another
Electromagnetic Radiation (EMR)
●spectra:
oGamma
▪Nuclear process
oX-Ray
▪Inner or core e- processes
oUltraviolet
▪Motion of valence e-
oVisible
▪motions of valence e-(400nm-700nm)
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Document Summary
Thermal or heat: not the same as temperature, directly proportional (positively correlated) Ekinetic= 0. 5(mv)2 used for particles: m=mass(kg, v=speed in ms-1. Eavg=3rt/2na: r=gas constant, t=temperature, na=avogadro"s number. Stored in the chemicals position and structure. Energy = e=mc2: m=mass, c=speed of light constant. Electrical charges: e=kq1q2/r (coulomb"s law, r=distance between particle centres, q1q2=charges, k=constant. Law of conservation of energy (1st law of thermodynamics) It can only be transformed and moved through substances from one place to another: transformation of energy from one type to another. Speed in emr: measured in velocity=v, similar to momentum. Difference lays in the mass: m/s or ms-1, speed in a vacuum=c, c=2. 998x108ms 1, c=lambda x nu (wavelength x frequency, nu=c/lambda (frequency = constant divided by wavelength, lambda=c/nu (wavelength = constant divided by frequency) Bohr model is the atomic solar system . Energy of a particle equals planck"s constant multiplied by frequency (e=hv)
