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CHEM1211 Exam 3

QuestionAnswer
Dilution To properly go from one concentration of a substance to a weaker concentration M1V1=M2V2
Photons Particles of light
Continuous spectrum Spectrum containing all the visible wavelengths of visible light as a result of white light passing through a prism
Line spectrum A spectrum only showing discrete wavelengths
How to explain the line spectrum With Bohr's model using the hydrogen atom
What did Bohr propose with his model The electron in a hydrogen atom moves around the nucleus in circular orbits
What does a higher to lower electron state mean Photon emission
What does a lower to higher electron state mean Photon absorption
When is the energy of an electron zero When the electron is free of the nucleus (n equals infinity)
What did Louis deBroglie propose All types of matter can display wave-like properties lambda=h/mv
Heisenberg's Uncertainty Principle We cannot simultaneously know the speed and position of an electron
Uncertainty Principle equation deltax*mdeltav is greater than or equal to h/4pi
EM spectrum by wavelength (lowest to highest) Gamma rays, X-rays, UV, Visible Light, IR, microwaves, radio waves
Photoelectric effect When light strikes the surface of certain metals, electrons are ejected
Postulates of the photoelectric effect - Emission only occurs at certain threshold frequencies - The electrons in the metal are held together by a binding energy, and light must surpass that energy to eject these electrons - Once you surpass V0, the number of electrons depends on intensity
What does it mean when work is done on the system Work (w) is positive
What does it mean when work is done by the system Work (w) is negative
Enthalpy The sum of a system's internal energy and the product of its pressure and volume
What is enthalpy equal to The heat at constant pressure
C3H8 Propane
Universe System and surroundings
Do electron orbits have a negative energy level Yes
Created by: ephemeral
 

 



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