Chegg
Location
Delhi | India
Job description
SME-Physical Chemistry is a vital source of knowledge, capability, or expertise in Chemical Engineering. The SME functions as the organizational representative for his/her knowledge area and applies his/her expertise to support the strategic direction of the organization. The expert is expected to display excellent command over CORE subject area to support academic content creation, audit, and analysis across Chegg content portfolio (Q&A/Textbook solutions/Videos/Flashcard etc.)
Responsibilities:
Requirements:
13. Electrochemistry & 14. Nuclear Chemistry
SME-Physical Chemistry Quantum chemistry
Quantization of energy, wave-particle duality; blackbody radiation; the photoelectric effect; atomic spectra and the Bohr model of the hydrogen atom; Quantum mechanical waves and the Schrodinger equation; Solving the Schrodinger equation: operators, observables, eigenfunctions, and eigen values; the postulates of quantum mechanics; the expectation value; the particle in one-dimensional box; particle in two- and three- dimensional box; commutating and non-commutating operators; the Heisenberg uncertainty principle; the quantum mechanical harmonic oscillator; quantization of angular momentum; the hydrogen atom, formulating and solving the Schrodinger s equation, eigen values and eigenfunctions of total energy; hydrogen atom orbitals, the radial probability distribution function
Chemical Bonding
Valence electrons, Stable electronic configurations, Lewis electron-dot symbols for atoms/ions, ionic bonds, octet rule, Lewis structure for ionic compounds, formulas and names of binary ionic compounds, electronegativity, covalent bonds, polar covalent bonds, determination of Lewis structures for polyatomic compounds/ions, the VSEPR theory, determination of molecular geometry.
Symmetry and group theory
Symmetry elements, symmetry operations, and point groups; Assigning point groups, Representations of symmetry operators, bases for representations, the character table, the great orthogonality theorem; symmetries of the normal modes of vibration of molecules.
Molecular spectroscopy
Pure rotational spectroscopy: the rigid diatomic molecule (rigid rotor); rotation of polyatomic molecules: linear molecules, spherical tops, symmetric tops, asymmetric top; the Stark effect; applications of microwave spectroscopy.
Vibrational spectroscopy of diatomic molecules: oscillations of systems with one degree of freedom, the diatomic molecule, the potential energy function for a chemical bond.
Vibrational spectroscopy of polyatomic molecules: rotation vibration spectra of polyatomic molecules, selection rules.
The Raman effect: classical treatment of Raman effect; quantum theory: rule of mutual exclusion, polarization of Raman lines, fermi resonance, influence of nuclear spin.
Electronic spectroscopy of diatomic molecules: The Born-Oppenheimer approximation; vibrational coarse structure; Frank-Condon principle; dissociation energy; electronic structure of diatomic molecules; electronic angular momentum in diatomic molecules; selection rules; rotational fine structure of electronic-vibrational transitions.
Electronic spectroscopy of polyatomic molecules: intensities of electronic transitions; types of electronic transitions; free electron model of linear polyenes; change of molecular shape on absorption.
Photochemistry
The Jablonski diagram; Beer-Lambert law; laws of photochemistry: Grotthus-Dapper law and Stark- Einstein law; Quantum yield; determination of quantum yield; photochemical reactions; kinetics of photochemical reactions; energy transfer in photochemical reactions: photosensitization and quenching; Quenching of fluorescence: The Stern-Volmer equation.
Thermodynamics
Thermodynamics and its importance; Internal energy and first law of thermodynamics; Heat; Work; State functions and path functions; reversible and irreversible processes; Heat capacity; Enthalpy; variation of enthalpy with temperature at constant pressure; variation of enthalpy with pressure at constant temperature; The Joule-Thomson experiment; Hess s law; Entropy and the second law of thermodynamics; Spontaneity; Absolute entropies and the third law of thermodynamics; heat engines and Carnot cycle; Gibbs energy and Helmholtz energy; fugacity and equilibrium constant for real gases.
Statistical thermodynamics
Stirling s approximation; probability distribution functions; microstates and configurations; Boltzmann distribution; Ensemble and molecular partition function; translational, rotation, vibrational and electronic partition function; the equipartition theorem; thermodynamic properties in terms of partition function; the Einstein solid; Residual entropy.
Solutions
Types of solutions; intermolecular forces in the solutions; concentration units: molarity, mole fraction, molality, percent by mass, percent by volume, part per million; factors affection the solubility: temperature and pressure; Henry s law; Ideal and non-ideal solution; Raoult s law; Colligative properties: vapor-pressure lowering, boiling-point elevation, freezing-point depression, osmotic pressure, electrolyte solutions, Van t Hoff factor; calculations using colligative properties; colloids.
Solid state and surface chemistry
Properties of solids; types of solids: amorphous and crystalline solids; types of crystalline solids: ionic crystals, covalent crystals, molecular crystals, metallic crystals; symmetry in crystal systems; Bravais lattices; Miller indices; interplanar spacing in a crystal system, X-ray diffraction, point defects.
Surface chemistry: Adsorption, chemisorption, applications of adsorption; adsorption of gases by solids; factors influencing adsorption; the Freundlich-adsorption isotherm; the Langmuir theory of adsorption; the BET theory of multilayer adsorption; types of adsorption isotherm; adsorption from solution: the Gibb s adsorption isotherm.
Chemical equilibrium
The concept of equilibrium; the equilibrium constant: calculating equilibrium constant, magnitude of equilibrium constant; equilibrium expressions: heterogeneous equilibria, gaseous equilibria; chemical equilibrium and Gibb s free energy; calculating equilibrium concentrations; Le-Chatelier s principle: factors affecting equilibrium, addition/removal of a substance, change in volume and pressure, change in temperature, change in volume, catalysis.
Gaseous state- Molecular dynamic
Properties of gases; the kinetic molecular theory of gases: molecular speed, diffusion and effusion (Graham s law); gas pressure: calculation and measurement of pressure; the gas laws: Boyle s law, Charles s law, Gay-Lussac s law, Avogadro s law, combined gas law; Ideal gas equation, applications of ideal gas equation; Real gases: factors that cause deviation from ideal behavior, the Van der Walls equation, Van der Waals constants; Gas mixtures, Dalton s law of partial pressure.
Chemical kinetics
Reaction rates; collision theory of chemical reactions; measuring reaction progress and expressing reaction rates: average rate of reaction, instantaneous rate, stoichiometry and reaction rate; Dependence of reaction rate on reactant concentration: the rate law, experimental determination of rate law; Dependence of reaction concentration on time: first order reactions, second order reactions; Dependence of reaction rate on temperature: the Arrhenius equation; reaction mechanisms: elementary reactions, rate-determining step, mechanism with a fast first step; Catalysis: heterogeneous catalysis, homogeneous catalysis, enzymes: biological catalysts.
Electrochemistry
Balancing redox reactions; galvanic cells; standard reduction potentials; spontaneity of redox reactions under standard state conditions; spontaneity of redox reactions under conditions other than standard state: Nernst equation, concentration cells; batteries: dry cells and alkaline batteries, lead storage batteries, lithium-ion batteries, fuel cells; electrolysis, quantitative applications of electrolysis; corrosion.
Nuclear chemistry
Nuclei and nuclear reactions; nuclear stability: types of nuclear decay; nuclear binding energy; natural radioactivity; kinetics of radioactive decay; dating based radioactive decay; nuclear transmutation; nuclear fission; nuclear fusion; uses of isotopes: chemical analysis, isotopes in medicines; biological effect of radiation.
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