ahmedabudief

Dr. Ahmed Mohamed Abu-Dief

Professor - Professor of Physical and Inorganic Chemistry

Faculty of science

Address: Behind hospital of Sohag University - Ali Ebn Abi Taleb Street

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2023-04-04 02:32:47 | 9 | PRINCIPLES IN CORROSION
Problem
Cu metal (E = 0.34V) was immersed in acidic solution of pH=4, determine the theoretical tendency for Cu corrosion in this media. Read more

2023-04-04 02:30:26 | 14 | PRINCIPLES IN CORROSION
Calculate 1
Calculate the theoretical tendency of NICKEL (Eo= -0.25) to corrode in water of pH=7.Assume corrosion products are H2 and Ni(OH)2 the solubility product of which is 1.8×10-15. Read more

2023-04-04 02:29:07 | 21 | PRINCIPLES IN CORROSION
Calculate
1- Calculate the exact half cell potential of Nickel (Eo= -0.25) in a 0.01 M NiSO4 solution. Read more

2023-04-04 02:27:52 | 34 | PRINCIPLES IN CORROSION
Choose the best answer
1- What conditions are required for rusting to take place in an eques solution? a) Water only b) Oxygen only c) Water and oxygen d) Water and carbon dioxide 2-Corrosion occurs because the metal need to returns to their: a) metastable compounds b) unstable compounds c) pure forms d) stable compounds 3- A positive cell potential is significant of: a) ... Read more

2022-06-04 11:15:52 | 12 | Advanced Physical Chemistry
Kinetics
Choose the correct answer or answers Read more

2022-03-07 14:55:24 | 30 | Advanced Physical Chemistry
CONDUCTIVITY OF SOLUTIONS1
1- WHICH PAIRING OF QUANTITY AND UNIT IS INCORRECT? A- RESISTIVITY; Ω M. B- CONDUCTANCE; S M–1. C- RESISTANCE; Ω. D- MOLAR CONDUCTIVITY; S M2 MOL–1. 2- WHICH OF THE FOLLOWING IS NOT A STRONG ELECTROLYTE? A- KCL B- CH3COOH C- KNO3 D- NACLO4 3- Which statement is correct about a strong electrolyte? A- Examples of strong electrolytes include CH3CO2H ... Read more

2022-03-07 14:41:29 | 32 | Advanced Physical Chemistry
Conductivity of Solutions
Choose the correct answer 1. Conductivity is defined as the ability to carry ____________ a) Voltage b) Resistance c) Current d) All of the mentioned 2. The reciprocal of conductivity is ____________ a) Viscosity b) Resistivity c) Turbidity d) None of the mentioned 3- Choose the correct order of molar ionic conductivities of the following ions. a) Li < Na ... Read more

2021-02-08 02:25:31 | 139 | INSTRUMENTS & LAB SAFETY: SCI 101
Trure of false
Put true or false * You should always wash your hands before and after lab. 2. Food and drinks are allowed in the lab. 3.Lab coats much be taken off when exiting the lab and entering a non-laboratory area. 4. Good Laboratory Practice (GLP) is a method employed in a laboratory setting to prevent contamination, accidents and injuries. Read more

2021-02-08 01:28:39 | 124 | INSTRUMENTS & LAB SAFETY: SCI 101
Good work practices
Good work practices include, a. smelling and tasting chemicals b. not washing hands before and after lab c. confining long hair and loose clothing d. using damaged equipment and glassware. Read more

2021-02-08 01:24:27 | 119 | INSTRUMENTS & LAB SAFETY: SCI 101
Fire in the laboratory
If there is a fire in the laboratory what are the right steps that should be taken? a. Use fire extinguishers to put out the fire b. Wait for someone to come c. Shut off the gas and electricity only if you know how to; close the doors; exit the building; pull fire alarm (located by each exit) on the ... Read more