lobna.nassr

Lobna Abdel-Mohsen Ebaid Nassr

Professor - 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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اسس الكيمياء الكيناتيكية

2018-12-01 22:51:39 الكيمياء الكيناتيكية
العوامل المؤثرة على سرعة التفاعل الكيميائى توجد مجموعة من العوامل المهمة التي ثؤثر في سرعة التفاعل الكيميائي وهي كالآتي: 1- طبيعة المواد المتفاعلة تختلف سرعة التفاعل الكيميائي وتتفوات بشكل كبير ، حسب طبيعة المواد ... Read more

The Critical Point

2018-12-01 22:39:48 Kinetic Theory 321 C
THE CRITICAL POINT In thermodynamics, a CRITICAL POINT (or CRITICAL STATE) is the end point of a phase equilibrium curve. The most prominent example is the liquid-vapor critical point, the end point of the ... Read more

Basic copper carbonates

2018-12-01 22:15:51 Transition Elements 311 C
BASIC COPPER CARBONATES Copper in moist air slowly acquires a dull green coating because its top layer has oxidised with the air. Some architects use this material on rooftops for this interesting colour. The ... Read more

Reaction order

2018-12-01 21:00:02 Physical Chemistry 251 C
REACTION ORDER The reaction order is the relationship between the concentrations of species and the rate of a reaction. INTRODUCTION The _order_ of a rate law is the sum of the exponents of its ... Read more

Rate Determining Step

2018-12-01 20:46:33 Physical Chemistry 251 C
THE RATE DETERMINING STEP The rate determining step is the slowest step of a chemical reaction that determines the speed (rate) at which the overall reaction proceeds. The rate determining step can be compared ... Read more

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