Lecture 8 Flashcards
Thermochemical equation
A balanced equation that includes ΔHrxn
Hess’s law
States that the Enthalpy change of an overall process is the sum of the Enthalpy changes of its individual steps
Equation for the speed of light
c = λ * v
speed of light
3.00 X 10^8
Frequency
Number of cycles a wave undergoes per second (s- or Hz)
Wavelength
Distance between to peaks or troughs (in nm)
Low energy vs high energy wavelength
Low = waves as spread apart
High = waves are close together
Amplitude
Related to the intensity of the wave radiation
Electromagnetic spectrum
High
Gamma rays
X-rays
Ultraviolet
Visible
Infrared
Microwaves
Radio waves
Low
Planck radiation law
E = hv = hc/λ
Planck constant
6.626 X 10^-34 J*s
Quantum
Fixed quantity of energy
Visible light
A type of electromagnetic radiation
Speed
Distance it moves per unit time (m/s)
Standard heat of formation
Enthalpy change for the chemical reaction when 1 mol if a compound in its standard state is produced from its component elements in their standard states
Standard state
A set of specific conditions used to compare thermodynamic data; indicated by a superscript zero on the thermodynamic symbol
Higher amplitude
Brighter light
Transition between types of light is
Fluid- there is not clean distinction
Refraction
Change in direction of light wave when passing boundary between materials (the way light refracts into water)
Diffraction
Light wave bends around edge of opening in object (bends around both edges of a small opening forming a semicircular wave)
