lobna.nassr

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

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Zero - order reaction

2018-12-01 20:43:44 Physical Chemistry 251 C
ZERO-ORDER REACTIONS In some reactions, the rate is _apparently _independent of the reactant concentration. The rates of these ZERO-ORDER REACTIONS do not vary with increasing nor decreasing reactants concentrations. This means that the rate ... Read more

Consecutive Reactions

2018-12-01 20:34:55 Physical Chemistry 251 C
KINETICS OF CONSECUTIVE REACTIONS Many physical chemistry texts discuss the kinetics of sequential or consecutive reactions, viz: _A -k1-> B -k2-> C_ Some of them derive or present equations that relate the time-dependent concentrations ... Read more

Parallel Rection

2018-12-01 20:25:33 Physical Chemistry 251 C
PARALLEL REACTION Parallel reactions are those reactions in which the reactant can form one of two or more products. Parallel reactions are concurrent chemical reactions with at least one common reactant. The term is ... Read more

Production and Interaction of X rays

2018-12-01 10:52:17 Spectroscopic Methods of Analysis 531 C
The attached chapter deals with the production of X rays and their mechanisms of interaction with materials. The emphasis is placed on X rays useful for diagnostic imaging, that is in the energy range ... Read more

X-ray Powder Diffraction

2018-12-01 10:42:11 Spectroscopic Methods of Analysis 531 C
X-Ray Analytical Methods X-rays were discovered by W.C. Röentgen in 1895, and led to three major uses: • X-RAY RADIOGRAPHY is used for creating images of light-opaque materials. It relies on the relationship between ... Read more

Determination of Cu ions

2018-12-01 10:28:45 Spectroscopic Methods of Analysis 531 C
The cursory look at the literature survey revels the fact that Copper reacts with many organic reagents. It also indicates that some of the reagents recommended suffering through limitations such as interference of Ni(II)2, ... Read more

Spectrophotometric Determination of metal ions

2018-12-01 10:23:29 Spectroscopic Methods of Analysis 531 C
Thio compounds play a vital role in analytical chemistry due to highly sensitive colour reaction, stability and selectivity towards various metal ions1−12. Xanthates have -CS2 group which makes them more reactive towards various metals. ... Read more

Determination of Cr(VI)

2018-12-01 10:17:32 Spectroscopic Methods of Analysis 531 C
Chromium is one of the most widely distributed heavy metals in the earth’s crust. It is normally found in two oxidation states ie Cr(III) and Cr(VI). Chromium is required in small quantities as an ... Read more

Determination of Iron With 1,10-Phenanthroline

2018-12-01 10:12:41 Spectroscopic Methods of Analysis 531 C
1,10-phenanthroline (C12H8N2, ortho-phenanthroline or o-Phen) is a tricyclic nitrogenh eterocyclic compound that reacts with metals such as iron, nickel, ruthenium, and silver to form strongly colored complexes. This property provides an excellent and sensitive ... Read more

Stability of a colloidal system

2018-12-01 10:05:08 Special Course (Physical Chemistry) 625 C
The stability of a colloidal system is defined by particles remaining suspended in solution at equilibrium. Stability is hindered by aggregation and sedimentation phenomena, which are driven by the colloid's tendency to reduce surface ... Read more