radiation can even produce a population inversion‚ where N2>N1 Fluorescence & Phosphorescence : a “forbidden” slow process (possible only because of spin-orbit coupling) : milliseconds to hours : picoseconds to milliseconds Molecular Orbital Diagrams for CO Particle-in-a-box model for conjugated molecules Ethylene Butadiene Octatetraene • Energy levels for a particle in a (1-D) box: En α n2/mL2 – where n is the quantum number‚ – m is the mass of the particle‚ – and L is the
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Chemical bond From Wikipedia‚ the free encyclopedia A chemical bond is an attraction between atoms that allows the formation of chemical substances that contain two or more atoms. The bond is caused by the electrostatic force of attraction between opposite charges‚ either between electrons and nuclei‚ or as the result of a dipole attraction. The strength of chemical bonds varies considerably; there are "strong bonds" such ascovalent or ionic bonds and "weak bonds" such as dipole–dipole interactions
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ion‚ specifically hemoglobin. It can be see the iron group which is located at the center of the molecule‚ and in this example is responsible for the attachment of oxygen. 2. The [Be(H2O)4]2+ complex ion will have to hybridize the 1s2 and 2s2 orbitals. 3. Lewis bases‚ they are donating electrons to the complex metal cation 4. 5. Data Sheet Names:______________________________ 6. Section 1 (Introduction to Isomers) 7
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Chemistry F332 Notes Ions in solids and solutions: Structure of an ionic lattice (Sodium Chloride): * Consists of sodium ions (Na+) surrounded by six chloride ions (Cl-) * Chloride ions also surrounded by six sodium ions. * Held together by attraction of oppositely charged ions. * Giant ionic lattice. * Electrostatic bonds hold lattices together. * Structure is simple cubic. * Some ionic crystals contain water. * Known as water of crystallisation. * These crystals
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Name: __________________________________ Teacher: ________________________________ DO NOT OPEN THE EXAMINATION PAPER UNTIL YOU ARE TOLD BY THE SUPERVISOR TO BEGIN Chemistry 2202 FINAL EXAMINATION June 2010 Value: 100% General Instructions This examination consists of two parts. Both parts are contained in this booklet and further general instructions are provided on appropriate pages. Part I – Multiple Choice (40%) Select the letter of the correct response from those provided. EITHER
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ionization energy for Ne is significantly greater than Na. 4. Distinguish between ionization energy and electronegativity. 5. How does VSEPR Theory account for the fact that the bond angle in H2O is less than NH3? 6. Which of the following molecules are polar? Include diagrams detailing their molecular shape (according to VSEPR)‚ bond angles and molecular dipole (if present). CO2 BCl3 NF3 AsH3 CCl4 CH2Cl2 N2 H2S 7. Distinguish between
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SBI4U-C 1 Lesson Introducing Biochemistry 1 Lesson 1 Biology SBI4U-C Introduction If you think about it‚ living things are made up of chemicals. The cells‚ tissues‚ organs‚ and organ systems that together make up a functioning organism are all the product of interacting chemicals. In order to understand how the organism functions‚ you must also recognize how these chemicals function. The study of the chemicals that are involved in living things is known as biochemistry
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valence electron. Loss of this valence electron forms a sodium cation‚ symbolized as Na+‚ which has the especially stable electronic configuration of the noble gas neon‚ 1s22s22p6. The sodium cation now has eight electrons that fill the 2s and three 2p orbitals. Magnesium (group 2A) has 12 protons and 12 electrons in the neutral atom. This gives magnesium two more electrons than neon‚ the noble gas closest to it in the periodic table. In losing two electrons‚ magnesium forms a cation with a+2 charge‚ which
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will be for the exo stereochemistry. The reason for this is because the reaction favors the product that involves the maximum overlap of pi electrons in its transition state‚ which in this case‚ is the endo isomer. To ease the concerns of orbital overlap between the HOMO (Highest Occupied Molecular Orbital) of cyclopentadiene with the LUMO (Lowest Unoccupied Molecular Orbital) maleic anhydride‚ reactants are used which possess electron withdrawing groups on the dienophile (maleic anhydride) and electron
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1. Which of the following statements about heat is false? A) If heat flows into a system‚ the extra energy of the system appears in the form of internal energy. B) A hot object possesses more heat than a cold object. C) If the system and surroundings are in thermal equilibrium‚ there is no heat flow between them. D) A process in which heat flows out of a system is said to be exothermic. E) Heat is a form of energy flow. B is false. If you compare a cup of water at 25oC and a bath tub of
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