CHAPTER-23 HW. Rahaf AlBathi 121114 Question 1 The electron configuration of a Ni2+ ion is: | A) [Ar]4s23d8 | | B) [Ar]4s23d6 | | C) [Ar]3d8 | | D) [Ar]3d6 | Question 2 The Fe3+ ion has _____ electrons in 3d orbitals. | A) 6 | | B) 5 | | C) 4 | | D) 3 | | E) 2 | Question 3 A ligand is: | A) a molecule or ion that has at least one lone pair of electrons | | B) a nucleophile | | C) a Lewis base | | D) part of a coordination compound |
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CH 202 Breakdown UV/Vis: Molecules containing π-electrons or non-bonding electrons (n-electrons) can absorb the energy in the form of ultraviolet or visible light to excite these electrons to higher anti-bonding molecular orbitals. The more easily excited the electrons (i.e. lower energy gap between the HOMO and the LUMO)‚ the longer the wavelength of light it can absorb. Conjugation raises the energy of the bonding orbitals and lowers the energy of the antibonding molecular orbital. This
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water takes to reach its destination. This can be applied in the variables of resistance. The electrons ’bounce ’ off the atoms - this causes the electrons to head elsewhere rather than the desired direction. In a long tube there are more atoms‚ this slows the electrons down as they ’bounce ’ off into another direction. In a short tube‚ there are less atoms which means there are less to deflect the electron any more speeding the speed up. In theory‚ the length should be proportional to the resistance
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General Features of Oxidative Additions Oxidative addition reactions usually involve a coordinatively unsaturated 16-electron metal complex or five-coordinate 18-electron species‚ and take the general from: [pic] If the A and B ligands in the product are considered to be formally –1‚ then the metal center has increased its oxidation state by +2‚ and this is the origin of the name oxidative addition. Oxidative reaction can occur when a metal complex
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inversely proportional to the percent transmission for the yellow light which implied more photoelectrons were emitted for greater intensity. Stopping potentials for green light was noted to be higher than of yellow light. Ratio of Planck’s constant to electron charge and work function of the photocathode were determined experimentally from the plot of frequency vs. stopping potential from the first and second orders of spectral lines of mercury. The h/e ratio from the plot was 2.345 × 10-15 eV•s with 43
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Introduction: Electrons are negatively charged subatomic particles found in all atoms. Electrons have particle-wave duality‚ meaning they exhibit characteristics of particles‚ and characteristics of waves. A wave is a periodic function‚ meaning that the function returns to the same value at regular intervals. Also‚ waves have crests and troughs‚ meaning there are repeated local maxima (crests) and minima (troughs). Waves also have a wavelength and frequency. The wavelength is the distance in
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Explain the role of atomic number in MiniLab: Modeling Isotopes‚ p. 102 How Atoms Differ 2 sessions 1 block determining the identity of an atom. 6. Define an isotope and explain why atomic masses are not whole numbers. 7. Calculate the number of electrons‚ protons‚ and neutrons in an atom given its mass number and atomic number. Section 4.4 8. Explain the relationship between Careers Using Chemistry: Radiation Unstable Nuclei and Radioactive Decay 2 sessions 1 block unstable nuclei and radioactive
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small the radii of most atoms fall within the range of 5 x 10^-11 m to 2 x 10^-10m atoms can be seen in scanning electron microscopes atoms can be moved 4.2 Structure of the Nuclear Atom Overview Lots of Dalton’s theory is accepted except that atoms can be divided Atoms can be divided into three subatomic particles Protons Neutrons Electrons Subatomic Particles Electrons Discovered by UK physicist J.J. Thomson (1856-1940) Are negatively charged subatomic particles. Thomson’s Experiment
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Photoelectric effect Shining light on a metal causes electrons to be emitted Below some frequency‚ no photons are emitted regardless of intensity of light. As frequency of the light increases‚ the kinetic energy of the emitted electrons increase. As the intensity of the light increases under a certain frequency‚ the number of the electrons ( current I) increases. Photon energy is quantized. Some energy is needed to liberate an electron form a material. This amount of energy is called the
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1. a) Democritus reasoned that if matter could be infinitely divided‚ it was also subject to complete disintegration from which it can never be put back together. However‚ matter can be reintegrated. b) In Greek‚ the prefix "a" means "not" and the word "tomos" means cut. Our word atom therefore comes from atomos‚ a Greek word meaning uncuttable. All matter is composed of atoms‚ which are bits of matter too small to be seen. These atoms CANNOT be further split into smaller portions. 2. At
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