Chapter 4 Powerpoint
... Light can only cause electrons to be ejected from a metallic surface if that light is at least a minimum threshold frequency . The intensity is not important. If light were only a wave intensity would be the determining factor, not the frequency! ...
... Light can only cause electrons to be ejected from a metallic surface if that light is at least a minimum threshold frequency . The intensity is not important. If light were only a wave intensity would be the determining factor, not the frequency! ...
Chapter7Part3
... a particle of light, called a photon has: Energy = E = h and Momentum = mass x speed = m c ...
... a particle of light, called a photon has: Energy = E = h and Momentum = mass x speed = m c ...
key - gcisd
... 1. The atomic number is equal to the number of protons. 2. The mass number is equal to the protons+ neutrons. 3. Electrons in the outermost energy level are known as valence electrons and are available to be lost, gained or shared when molecules are formed. 4. What causes an atom to be neutrally cha ...
... 1. The atomic number is equal to the number of protons. 2. The mass number is equal to the protons+ neutrons. 3. Electrons in the outermost energy level are known as valence electrons and are available to be lost, gained or shared when molecules are formed. 4. What causes an atom to be neutrally cha ...
Problem Set 1
... 4. An electron is in the n = 2, l = 1 state of the hydrogen atom. Write down the passible wave functions of the electron including its intrinsic spin. The wave function ~ J~ and Jz where J~ is the total angular momentum operator must be eigenfunctions of J. and Jz is its z-component. ( You have a to ...
... 4. An electron is in the n = 2, l = 1 state of the hydrogen atom. Write down the passible wave functions of the electron including its intrinsic spin. The wave function ~ J~ and Jz where J~ is the total angular momentum operator must be eigenfunctions of J. and Jz is its z-component. ( You have a to ...
Exam 2 with Solutions - Little Dumb Doctor .Com
... 10. In the Lewis electron dot structure for hydrazine, N2H4, the total number of lone electron pairs around the two nitrogen atoms is c. 2 11. Which compound contains a carbon-oxygen bond with a bond order of 2? a. CO2 12. Using the VSEPR theory, predict the molecular shape of ClF3. b. T-shaped 13. ...
... 10. In the Lewis electron dot structure for hydrazine, N2H4, the total number of lone electron pairs around the two nitrogen atoms is c. 2 11. Which compound contains a carbon-oxygen bond with a bond order of 2? a. CO2 12. Using the VSEPR theory, predict the molecular shape of ClF3. b. T-shaped 13. ...
Chapter 6 Outline full
... • It cannot explain the spectra of atoms other than hydrogen. • Electrons do not move about the nucleus in circular orbits. ...
... • It cannot explain the spectra of atoms other than hydrogen. • Electrons do not move about the nucleus in circular orbits. ...
CHM111 Lab – Atomic Emission Spectroscopy – Grading Rubric
... Every element has a distinct spectrum which can be used to identify it, much like a fingerprint. Helium was discovered when scientists looking at light from the sun noticed an absorption spectrum pattern that didn’t correspond to any known element. In part A of the this experiment, three lamps ...
... Every element has a distinct spectrum which can be used to identify it, much like a fingerprint. Helium was discovered when scientists looking at light from the sun noticed an absorption spectrum pattern that didn’t correspond to any known element. In part A of the this experiment, three lamps ...
Document
... • Quantum physics explains the energy levels of atoms with enormous accuracy. This is possible, since these levels have long lifetime (uncertainty relation for E, t). • Radiation from atoms and molecules enables the most accurate time and length measurements: Atomic clocks • Quantum physics explai ...
... • Quantum physics explains the energy levels of atoms with enormous accuracy. This is possible, since these levels have long lifetime (uncertainty relation for E, t). • Radiation from atoms and molecules enables the most accurate time and length measurements: Atomic clocks • Quantum physics explai ...
AP Atomic Structure Set 1
... 2. The emission spectrum of hydrogen consists of several series of sharp emission lines in the ultraviolet (Lyman series), in the visible (Balmer series), and in the infrared (Paschen series, Brackett series, etc,) regions of the spectrum. (1981) (a) What feature of the electronic energies of the hy ...
... 2. The emission spectrum of hydrogen consists of several series of sharp emission lines in the ultraviolet (Lyman series), in the visible (Balmer series), and in the infrared (Paschen series, Brackett series, etc,) regions of the spectrum. (1981) (a) What feature of the electronic energies of the hy ...
Valence electrons and Lewis Dot Structures
... 1. Write the symbols down, metal first. 2. Determine the charge of each ion, either from its position on the PT or a chart like 7-8 on p. ...
... 1. Write the symbols down, metal first. 2. Determine the charge of each ion, either from its position on the PT or a chart like 7-8 on p. ...
![L 34 Modern Physics [1]](http://s1.studyres.com/store/data/001537103_1-dca58a96feb57d01fab60ba8bdd791ec-300x300.png)
L 34 Modern Physics [1]
... orbits or states in which then do not radiate. • The electron in a high energy state can make a transition to a lower energy state by emitting a photon whose energy was the difference in energies of the two states, hf = Ei - Ef ...
... orbits or states in which then do not radiate. • The electron in a high energy state can make a transition to a lower energy state by emitting a photon whose energy was the difference in energies of the two states, hf = Ei - Ef ...
Document
... The atomic number, Z, equals the number of protons in the nucleus. The neutron number, N, is the number of neutrons in the nucleus. The mass number, A, is the number of nucleons in the nucleus. A=Z+N “Nucleon” is a generic term used to refer to either a proton or a neutron. The mass number is not th ...
... The atomic number, Z, equals the number of protons in the nucleus. The neutron number, N, is the number of neutrons in the nucleus. The mass number, A, is the number of nucleons in the nucleus. A=Z+N “Nucleon” is a generic term used to refer to either a proton or a neutron. The mass number is not th ...
X-ray photoelectron spectroscopy
X-ray photoelectron spectroscopy (XPS) is a surface-sensitive quantitative spectroscopic technique that measures the elemental composition at the parts per thousand range, empirical formula, chemical state and electronic state of the elements that exist within a material. XPS spectra are obtained by irradiating a material with a beam of X-rays while simultaneously measuring the kinetic energy and number of electrons that escape from the top 0 to 10 nm of the material being analyzed. XPS requires high vacuum (P ~ 10−8 millibar) or ultra-high vacuum (UHV; P < 10−9 millibar) conditions, although a current area of development is ambient-pressure XPS, in which samples are analyzed at pressures of a few tens of millibar.XPS is a surface chemical analysis technique that can be used to analyze the surface chemistry of a material in its as-received state, or after some treatment, for example: fracturing, cutting or scraping in air or UHV to expose the bulk chemistry, ion beam etching to clean off some or all of the surface contamination (with mild ion etching) or to intentionally expose deeper layers of the sample (with more extensive ion etching) in depth-profiling XPS, exposure to heat to study the changes due to heating, exposure to reactive gases or solutions, exposure to ion beam implant, exposure to ultraviolet light.XPS is also known as ESCA (Electron Spectroscopy for Chemical Analysis), an abbreviation introduced by Kai Siegbahn's research group to emphasize the chemical (rather than merely elemental) information that the technique provides.In principle XPS detects all elements. In practice, using typical laboratory-scale X-ray sources, XPS detects all elements with an atomic number (Z) of 3 (lithium) and above. It cannot easily detect hydrogen (Z = 1) or helium (Z = 2).Detection limits for most of the elements (on a modern instrument) are in the parts per thousand range. Detection limits of parts per million (ppm) are possible, but require special conditions: concentration at top surface or very long collection time (overnight).XPS is routinely used to analyze inorganic compounds, metal alloys, semiconductors, polymers, elements, catalysts, glasses, ceramics, paints, papers, inks, woods, plant parts, make-up, teeth, bones, medical implants, bio-materials, viscous oils, glues, ion-modified materials and many others.XPS is less routinely used to analyze the hydrated forms of some of the above materials by freezing the samples in their hydrated state in an ultra pure environment, and allowing or causing multilayers of ice to sublime away prior to analysis. Such hydrated XPS analysis allows hydrated sample structures, which may be different from vacuum-dehydrated sample structures, to be studied in their more relevant as-used hydrated structure. Many bio-materials such as hydrogels are examples of such samples.