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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Complex Shapes

2018-12-01 00:43:32 Transition Elements 311 C
Transition metals can have any of four possible ion complex shapes. The ION COMPLEX SHAPE is the orientation of LIGANDS, or molecules that are attached to the transition metal. The shape that a metal ... 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 rises to a maximum and the cluster ... Read more

RDS

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: it must be slow _and _be an ... Read more

Peroxo compounds of Chromium (VI)

2018-11-30 22:47:41 Transition Elements 311 C
PEROXO COMPOUNDS OF CHROMIUM (VI) When CR6CR6+ reacts with H2O2H2O2H2O2H2O2, the product depends on the PH and [CR6+][CR6+][CR6+]: IN ACIDIC SOLUTION: CrO(O2)2 is formed. It is a deep blue – violet compound which decomposed ... Read more

Applications of zirconium and its compounds

2018-11-30 22:32:43 Transition Elements 311 C
APPLICATIONS OF zirconium and zirconium compounds Zirconium is a member of titanium group. Zirconium is used in nuclear reactors. - Zirconium Diamide-Diamine complexes can be used to catalyze the polymerization of alkenes. - Zircon ... Read more

Cr(III) Acetate

2018-11-30 22:20:41 Transition Elements 311 C
OXIDATION STATE (+III) OF CHROMIUM (D3)OXIDATION STATE (+III) OF CHROMIUM (D3)OXIDATION STATE (+III) OF CHROMIUM (D3) Cr3+ form unusual BASIC ACETATE, [CR3O(CH3COO)6L3]+[CR3O(CH3COO)6L3]+[CR3O(CH3COO)6L3]+[CR3O(CH3COO)6L3]+[CR3O(CH3COO)6L3]+[CR3O(CH3COO)6L3]+[CR3O(CH3COO)6L3]+[CR3O(CH3COO)6L3]+[CR3O(CH3COO)6L3]+[CR3O(CH3COO)6L3]+ where L is refered to H2OH2OH2O or other ligand. Each CR atom ... Read more

Oxidation state (V) for Niobium

2018-11-30 22:10:43 Transition Elements 311 C
Oxidation state (V) for Niobium Niobium(V) halides Niobium(V) chloride is a yellow crystalline solid, forms chloro-bridged dimers in the solid state. Each niobium center is SIX-COORDINATE, but THE OCTAHEDRAL COORDINATION is significantly DISTORTED. THE ... Read more

Oxidation state (II) of molybdenum and tungsten

2018-11-30 21:59:32 Transition Elements 311 C
Oxidation state (II) of molybdenum and tungsten Halides of molybdenum(II) and tungsten(II) molybdenum(II) halides (MoX2) and tungsten(II) halides (WX2): All MX2 are known except MF2. MX2 are found as clusters, for example MoBr2 is ... Read more

Oxidation state (IV) for Niobium

2018-11-30 21:43:47 Transition Elements 311 C
Oxidation state (IV) for Niobium Niobium(IV) halides NIOBIUM(IV) CHLORIDE or NIOBIUM TETRACHLORIDE NbCl4 exists as dark violet crystals, it is HIGHLYSENSITIVE TO AIR AND MOISTURE, and disproportionates into niobium(III) chloride and niobium(V) chloride when ... Read more

Oxidation state (+II) of chromium

2018-11-30 21:41:34 Transition Elements 311 C
OXIDATION STATE (+II) OF CHROMIUM Chromium acetate dihydrate (red solid compound) is a good starting material for the preparation of other CR2CR2+ salts. It is prepared by adding CH3COONACH3COONACH3COONA to CR2CR2+ solution under N2 ... Read more