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UCR / Chemistry / CHEM 001A / What is the average atomic mass of neon?

What is the average atomic mass of neon?

What is the average atomic mass of neon?

Description

School: University of California Riverside
Department: Chemistry
Course: General Chemistry
Professor: Hill harman
Term: Fall 2018
Tags: Chemistry
Cost: 50
Name: Chemistry 1A Final Study Guide
Description: This study guide goes over information and concepts from chapters 1-7.
Uploaded: 12/07/2018
3 Pages 40 Views 3 Unlocks
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Chemistry Final Study GuideIf you want to learn more check out What is the meaning of skew symmetric matrix?

Atomic mass

  • Multiply mass of each of its isotopes by its natural abundance
  • Average atomic mass of neon
  • 19.9924 amu . 0.904838 = 18.08988 amu
  • 20.9940 amu . 0.002696 = 0.05660 amu
  • 21.9914 amu . 0.092465 = 2.03344 amu
  • 20.17992 amu

Molecular mass

  • Add up average atomic masses of the atoms in each of its molecules
  • Sulfur dioxide (SO2)
  • 64.063 amu / molecule SO2

Atoms to moles

  • Multiply using conversion factor of one mole equals 6.0221 . 10^23 atoms
  • 2.4 x 10²² atoms Cu. 1mcl / 6.0221.10^23 atoms
  • 4.0.10^-2 molCU
  • Note: atomic mass can be expressed in amu/atom or g/mol

Quantum theory

  • An equation that relates the energy of a quantum of electromagnetic radiation to its wavelength
  • E = hc/入
  • H is planck’s constant which is 6.626.10^34 J
  • C is speed of light: 2.998.10^8 m/s
  • 入 stands for wavelength

Photoelectric effect

  • Electrons are emitted from metals and semiconductor materials when they are illuminated by and absorb electromagnetic radiation
  • The minimum quantity of energy needed to emit photoelectrons from a photoelectric material is its work function (Φ)
  • Φ=hv - kElectrons
  • If Φ of mercury is 7.22.10^-19 J, then what is the minimum frequency of radiation required to eject photoelectrons from a mercury surface?

Hydrogen spectrum

  • Rydberg’s equation
  • Term on left side of the equation is the wavenumber of a line spectrally
  • n1 and n2 are any positive integers (given n2>n1)
  • n1 and n2 correspond to energy levels inside hydrogen atoms
  • Rh is Rydberg constant
  • When regions of electromagnetic spectrum Rh = (1.097.10^-2 nm^-1)
  • Rydberg’s equation with actual constant

  • Bohr’s Model
  • Orbits farther from nucleus have larger values of n
  • Electrons in large n value orbits have higher energies
  • E = -2.178 . 10^18 J (1/n²)
  • In practice if n=2

E=-2.178.10^-18 J (1/2²)If you want to learn more check out What is the difference in position of some image on two retinas?
Don't forget about the age old question of Why is argument a good thing?
We also discuss several other topics like What is electric dipole?
Don't forget about the age old question of uo class
We also discuss several other topics like What is the difference between biotic factors and abiotic factors?

 = -5.445.10^19 J

  • Can modify the equation to find change in energy
  • ΔE= - 2.178 . 10^-18 J (1/n final² - 1/n initial²)
  • When n=1, electron in ground state
  • When n>1, electron in excited state

  • De Broglie Wavelengths
  • Equation shows that any moving particle has wavelike properties
  • 入 = h
  • m    mu

is mass

  • u is speed
  • h is planck’s constant
  • Use the equation to find the wavelength of a 0.142kg ball giong 44m/s

  • Electron configuration
  • Periodic table is divided into s,p,d,f orbitals
  • S orbitals can hold up to 2 electrons
  • P orbitals can hold up to 6
  • d orbitals can hold up to 10
  • f orbitals can hold up to 14
  • Naming compounds
  • Binary ionic compounds of main group elements
  • First word is the cation
  • Second word is anion with ending -ide
  • CaO has Ca^2+ and O^2- so it becomes calcium oxide
  • Binary ionic compounds of transition metal
  • Add roman numeral after name of transition metal to indicate positive charge
  • Copper (II) oxide is CuO
  • Copper (I) oxide is Cu2O

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