Lobna Abdel-Mohsen Ebaid Nassr

Professor - Head Of Chemistry Department- Director of Quality Management Unit - Faculty of Science - Sohag University

Faculty of science

Address: Chemistry Department - Faculty of Science - Sohag University



Chemical kinetics 321 C

2018-08-29 12:34:51 |

Chemical kinetics 321 C for third year students  - chemistry Program


1.Rates of complex reactions (Rev.)

2.Simplification of kinetic schemes

3.Reactions in Solutions

4.Reactions on Surfaces

5.Enzymatic Catalysis

6.Acid–Base Catalysis


2018-08-30 17:07:26 | Chemical kinetics 321 C
Inhibition of enzymes
COMPETITIVE INHIBITION is interruption of a chemical pathway owing to one chemical substance inhibiting the effect of another by competing with it for binding or bonding. In competitive inhibition of enzyme catalysis, binding of an inhibitor prevents binding of the target molecule of the enzyme, al... Read more

2018-09-26 20:40:51 | Chemical kinetics 321 C
Parallel and consecutive reactions
PARALLEL REACTIONS In the parallel reactions, a single reactant may be converted into several different products simultaneously. There are numerous examples of such reactions in organic chemistry. SERIES (CONSECUTIVE) FIRST-ORDER REACTIONS A similar situation of CONSECUTIVE REACTION is nuclear ch... Read more

2018-11-29 01:09:09 | Chemical kinetics 321 C
Acid / base  effect on an enzym
Deduce the relation between the reaction rate and substrate concentration for an enzym "HE" in both acidic and basic medium. Concerning the following: Kb=[H+][HE]/[H2E+] Ka=[H+][E-]/[HE] 0[E] = [HE] + [HES] + [H2E+] + [E-]... Read more

Effect of catalyst

2018-08-30 23:38:43 Chemical kinetics 321 C
Effect of catalyst Addition of a catalyst provides an alternative route for the reaction with a lower activation energy. Thus enhance the reaction rate. Read more


2018-11-30 23:06:52 Chemical kinetics 321 C
The rate-determining step of the chemical reactions The rate – determining step is core step of the reaction The rate-determining step is not just the SLOWEST step: i Read more

The activated complex

2018-11-30 23:14:48 Chemical kinetics 321 C
The ACTIVATED COMPLEX OF THE REACTION As the reaction event proceeds, A and Bcome into contact, distort, and begin to exchange or remove atoms. -The POTENTIAL ENERGY ri Read more

Effect of Ionic Strength

2018-11-29 20:53:53 Chemical kinetics 321 C
The increase in _I, _INCREASES the rate constant for reactions between ions of the SAME CHARGE and decreasesit when the ions are oppositely charged. For reactions in whi Read more

Solvent Cage Effect

2018-11-29 21:17:12 Chemical kinetics 321 C
THE SOLVENT CAGE EFFECT In the solution, the reactant molecules will remain close to each other for some times, being surrounded by a CAGE OF SOLVENT MOLECULES. This cag Read more