Chemical Sciences Lectures
 /  Chemical Sciences Lectures
  1. CHM101 – GENERAL CHEMISTRY 1 – LECTURE 1

    Otache Monday Abel

    Basic Postulates of Quantum Theory: Atoms and molecules can exist only in certain energy states. In each energy state, the atom or molecule has a definite energy. When an atom or molecule changes its energy state, it must emit or absorb just enough energy to bring it to the new energy state (the quantum condition). Atoms or molecules emit or absorb radiation (light) as they change their energies. The frequency of the light emitted or absorbed is related to the energy change by a simple equation.

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  2. CHM101 – GENERAL CHEMISTRY 1 – LECTURE 2

    Otache Monday Abel

    ATOMIC ORBITALS: Atomic orbitals are regions of space where the probability of finding an electron about an atom is highest. CHARACTERISTICS OF THE S-ORBITAL: s-orbitals are spherical in shape, There is one s orbital per n level, L = 0; 1 value of m = 0

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  3. CHM101 – GENERAL CHEMISTRY 1 – LECTURE 3

    Otache Monday Abel

    PERIODIC TABLE: Atomic radius and ionic radius are two ways to describe the size of an atom. Both concepts follow the same trends in the periodic table.

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  4. CHM210 – PHYSICAL CHEMISTRY – LECTURE 1

    Otache Monday Abel

    COLLISION FREQUENCY (Z): We treat the molecules as hard spheres (of diameter d) – like pool balls. For two molecules to collide, their centers must come within a distance d of each other.

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  5. CHM210 – PHYSICAL CHEMISTRY – LECTURE 2

    Otache Monday Abel

    Mean Free Path: Collision frequency allows for the determination of the mean free path. If a molecule is travelling with a relative speed c-and collides with a frequency z, the time it spends between each collision = 1/z. Therefore, the distance travelled between collision

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  6. CHM210 – PHYSICAL CHEMISTRY – LECTURE 3

    Otache Monday Abel

    BEHAVIOUR OF REAL GASES: We want to calculate how many molecules collide with the surface per unit time and per unit surface area.

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  7. CHM210 – PHYSICAL CHEMISTRY – LECTURE 4

    Otache Monday Abel

    ENTROPY AND FREE ENERGY: Spontaneous vs non-spontaneous, Thermodynamics vs kinetics, Entropy = randomness (So), Gibbs free energy (DGo), Thermodynamics of coupled reactions, DGrxn versus DGorxn, Predicting equilibrium constants from DGorxn, STANDARD ENTROPIES (SO): Every substance at a given temperature and in a specific phase has a well-defined Entropy.

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  8. CHM210 – PHYSICAL CHEMISTRY – LECTURE 5

    Otache Monday Abel

    PHASE EQUILIBRIUM: System: A body of engineering material under investigation. e.g. Ag – Cu system, NiO-MgO system (or even sugar-milk system). Component of a system: Pure metals and or compounds of which an alloy is composed, e.g. Cu and Ag or Fe and Fe3C. They are the solute(s) and solvent. Solubility Limit: The maximum concentration of solute atoms that may dissolve in the Solvent to form a “solid solution” at some temperature.

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