Week Three Notes
Week Three Notes Chem 105
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This 4 page Class Notes was uploaded by Marisa Loken on Friday September 18, 2015. The Class Notes belongs to Chem 105 at University of Wisconsin - Stevens Point taught by Dr. Riha in Fall 2015. Since its upload, it has received 77 views. For similar materials see Fundamental Chemistry in Chemistry at University of Wisconsin - Stevens Point.
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Date Created: 09/18/15
Week Three Notes Monday September 14 2015 Atom Nucleus 0 Contains protons neutrons o Electrons surround nucleus Law of Conservation of Mass Matter is neither created nor destroyed Mass of materials before the reaction occurred Law of Constant Composition Every sample of a compound is composed of the same elements in the same ratio Electrons Subatomic particles that carry a negative charge 1 Really small mass Nucleus Center of atom Contains a positive charge due to protons it contains Makes up bulk mass of atom o Protons Subatomic particles with positive charge 1 0 Neutrons Subatomic particles with no charge present mass of protons and neutrons is much greater than the electron Elements Were made of atoms with the same mass assumption Isotopes Atoms of the same type with different masses 0 Same number of protons but different number of neutrons 0 Discovery with cathode ray and neon Atomic number Number of protons present in an atom whole number Example AU 47 D atomic number Generic form of isotopic symbol A X Z A D mass number D protons and neutrons Z D atomic number D amount of protons neutral atoms contain the same number of protons and eectrons ions have a different number of protons and eectrons Cations D less electrons than protons positive charge Anions l more electrons than protons negative charge Average Atomic Mass Averageweighted average of the masses of all isotopes of that particular element 0 Example Neon 20 21 22 0 Atomic weight is isotope mass x fractional isotope abundance o 199924x0904838209940x0002696219914x0092465 201799amu o 2018amu Wednesday September 16 Atom Timeline Dalton 1803 Thomson lPlum pudding modelD1890 Rutherford1911Dprotons and neutrons Electromagnetic Spectrum all electrolytes Energy arranged by 0 Wavelength 0 Frequency 0 Energy Electromagnetic Radiation All different kinds of energy that is emitted into space Described by 0 Wavelength 0 Frequency 0 Energy Wavelength Distance between 2 adjacent peaks in a wave MMeters Frequency Number of cycles that pass a point in a given time Hz Hertz 1s Increase frequency decrease wavelength 0 lnversely related high frequency short wavelength All electromagnetic radiation travels at the speed of light c300x10quot8 ms Wavelength speed of lightfrequency Frequency wavelengthspeed of light Energy quantized Max Planck Continuous Spectrum No breaks in electromagnetic spectrum Line spectrum Discrete wavelengths of light Quantized Energy Energy that is allowed Continuous Energy Energy is allowed Planck s Constant H 6626x10A34 Energy Planck s constant x frequency E Energy in Jewels Photoelectric Effect discovered by Einstein If you shine light on a given energy on a middle surface the electrons are emitted from that surface 0 Certain energy required Energy required to emit an electron is called the work function 0 Green light has higher energy than red light Work function phi symbol 0 every metal has its own work function A lot of this section is reading in the Chemistry book Friday September 18 Today39s class was a lot of practice problems which were handed out in class Please take a look over them