ahmedabudief

Dr. Ahmed Mohammed Abu-Dief Mohammed

Assistant Professor - Assistant professor of Inorganic and Physical Chemistry

Faculty of science

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

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General Chemistry for Engineering students

2020-09-14 00:46:02 |

GENERAL COURSE Objectives:
1- Recognize basic concept and importance of chemistry
2- Determine qualitative and quantitative stoichiometry of the substances
3- Establish the formula and structure of the chemical substances
4- Recognize principles of thermochemistry
5- Identify the chemical equilibrium of acids and bases
6- Distinguish the electrochemistry
7- Recognize the chemistry of materials (elements, transition metals)
8-Explore the organic structure and reactions


Signifcant Figures
Write short notes on significant figures , measurments of volume,burete techniqe, wighting ?... Read more

Denisty
Wriite a brief Account on density and its onceptions?... Read more

Chmeical bonding
1.The valence electrons of representative elements are (a) in s orbitals only. (b) located in the outermost occupied major energy level. (c) located closest to the nucleus. (d) located in d orbitals. (e) located in the innermost occupied shell.... Read more

Chmeical bonding1
Which is classified as nonpolar covalent? (a) the H-I bond in HI (b) the H-S bond in H2S (c) the P-Cl bond in PCl3 (d) the N-Cl bond in NCl3 (e) the N-H bond in NH3... Read more

Chmeical bonding2
Consider the bicarbonate ion (also called the hydrogen carbonate ion). After drawing the correct Lewis dot structure(s), you would see: (a) two double bonds around the central carbon atom. (b) three single bonds around the central carbon atom. (c) four single bonds around the central carbon atom.... Read more

Acids
Arrhenius defined an acid as: (a) a species that can donate a proton. (b) a species that can accept a proton. (c) a source of OH- ions in water. (d) a sourse of H+ ions in water. (e) a species that can accept a pair of electron... Read more

Base
In the Bronsted-Lowry system, a base is defined as: (a) a proton donor. (b) a hydroxide donor. (c) an electron-pair acceptor. (d) a water-former. (e) a proton acceptor.... Read more

Acids1
In the equation: HF + H2O H3O+ + F- (a) H2O is a base and HF is its conjugate acid. (b) H2O is an acid and HF is the conjugate base. (c) HF is an acid and F- is its conjugate base. (d) HF is a base and H3O+ is its conjugate acid. (e) HF is a base and F- is its conjugate acid.... Read more

base1
For the system shown here: HOBr + OH- H2O + OBr- Bronsted would classify the base species as: (a) OH- and HOBr (b) H2O and OH- (c) OBr- and OH- (d) OBr- and HOBr (e) H2O and HOBr... Read more

Base2
According to the Lewis theory, a base _____ . (a) is a proton acceptor. (b) is a proton donor. (c) makes available a share in a pair of electrons. (d) produces OH- ions in aqueous solution. (e) accepts a share in a pair of electrons.... Read more

Solution
Calculate the MOLALITY of a solution that contains 51.2 g of naphthalene, C10H8, in 500 mL of carbon tetrachloride. The density of CCl4 is 1.60 g/mL. (a) 0.250 m (b) 0.500 m (c) 0.750 m (d) 0.840 m (e) 1.69 m... Read more

Solution1
Calculate the mole fraction of C2H5OH in a solution that contains 46 grams of ethanol, C2H5OH, and 64 grams of methanol, CH3OH.( a) 1/3 (b) 0.42 (c) 1/2 (d) 2/3 (e) none of these... Read more

Expriment3: Melting and boiling points
Write a short notes on melting and boiling points expriment?... Read more

Ionic compounds
* FLUORINE MOLECULE F2 HAS .........: FLUORINE MOLECULE F2 HAS .........: FLUORINE MOLECULE F2 HAS .........: * 6 lone pairs of electrons. * 4 lone pairs of electrons. * 8 lone electrons. * Answers (b) and (c).... Read more

bonding
* WHICH ONE OF THE FOLLOWING MOLECULES IS LINEAR? * BF3 * CO2 CO2 * H2S * SO2... Read more

molarity
* AN AQUEOUS SOLUTION OF ETHANOL, C2H5OH, IS 19.00% ETHANOL BY MASS AND HAS A DENSITY OF 0.9700 G ML-1. CALCULATE THE MOLARITY OF THE ETHANOL SOLUTION.AN AQUEOUS SOLUTION OF ETHANOL, C2H5OH, IS 19.00% ETHANOL BY MASS AND HAS A DENSITY OF 0.9700 G ML-1. CALCULATE THE MOLARITY OF THE ETHANOL SOLUTION.... Read more

osmotic pressure
* WHICH OF THE FOLLOWING AQUEOUS SOLUTIONS HAS THE HIGHEST OSMOTIC PRESSURE AT 25°C? * 0.2 M KBr * 0.2 M ethanol * 0.2 M Na2SO4 * 0.2 M KCl... Read more

Seperation of mixtures
Write a short notes on how to seperate the mixtures?... Read more

Determination number of Hyrated molecules
Write abrief account on the expriment of how determine number of Hyrated molecules.... Read more

Heat of solution
Write a brief account of how to determine heat of solution of unknown salt.... Read more

State function
1- Which one of the following thermodynamic quantities is NOT a state function? (a) Gibbs free energy (b) Enthalpy (c) Entropy (d) Internal energy (e) Work... Read more

Go for the reaction
Calculate Go for the reaction given the following information: 2SO2(g) + O2(g) = 2SO3(g) ΔGfo for SO2(g) = -300.4 kJ/mol; ΔGfo for SO3(g) = -370.4 kJ/mol (a) -70.0 kJ (b) +70.0 kJ (c) -670.8 kJ (d) -140.0 kJ (e) +140.0 kJ... Read more

Free energy
Which of the following statements regarding the Gibbs free energy change for a reaction is false? * a) The Gibbs free energy change is the proportion of the enthalpy change of a reaction that is used to increase the entropy. * b) If the Gibbs free energy change for a reaction is negative, the react... Read more

alkane
A molecule with the formula C3H8 is a(n): (a) hexane (b) propane (c) decane (d) butane (e) ethane... Read more

benzene
How many actual double bonds does the benzene ring possess? (a) None, carbon-carbon bonds in benzene are delocalized around the ring (b) 1 double bond (c) 2 double bonds (d) 3 double bonds (e) 4 double bonds... Read more

electrolytic cell
In an electrolytic cell the electrode at which the electrons enter the solution is called the ______ ; thechemical change that occurs at this electrode is called _______. (a) anode, oxidation (b) anode, reduction (c) cathode, oxidation (d) cathode, reduction (e) cannot tell unless we know the specie... Read more

Redox
Which of the following statements is FALSE? (a) Oxidation and reduction half-reactions occur at electrodes in electrochemical cells. (b) All electrochemical reactions involve the transfer of electrons. (c) Reduction occurs at the cathode. (d) Oxidation occurs at the anode. (e) All voltaic (galvanic)... Read more

فصل الكاتيونات
Give a brief account on identification of cations.... Read more

System
THE SYSTEM WHICH DOES NOT ALLOW THE EXCHANGE OF HEAT AND MASS Isolated system Open system Closed system Inert system... Read more

Cell potential
Using these metal ion/metal standard reduction potentials Zn2+(aq)|Zn(s) , Eo = -0.76 Ni2+(aq)|Ni(s) , Eo = -0.25 Calculate the standard cell potential for the cell whose reaction is (Ni2+(aq) + Zn(s) ↔ Zn2+(aq)+ Ni(s 0.51+ 1.01- 1.01+ 0.51-... Read more

formation of products
When reaction favors formation of products Eocell is positive Eocell = 0 Eocell is negative None of the answers... Read more

galvanic cell
A galvanic cell consists of a Cd(_s_)|Cd2+(_aq_) half-cell and a Zn(_s_)|Zn2+(_aq_) half-cell connected by a salt bridge. Reduction occurs in the cadmium half-cell. The cell can be represented in standard notation as Cd(_s_)|Cd2+(_aq_) || Zn(_s_)|Zn2+(_aq_ Zn(_s_)|Zn2+(_aq_) || Cd(_s_)|Cd2+(_aq_... Read more

heat evolved
HOW MUCH HEAT IS EVOLVED WHEN 256 G OF 2SO2 (MOLAR MASS = 64 G/MOL) IS BURNED ACCORDING TO THE CHEMICAL EQUATION SHOWN BELOW?HOW MUCH HEAT IS EVOLVED WHEN 256 G OF 2SO2 (MOLAR MASS = 64 G/MOL) IS BURNED ACCORDING TO THE CHEMICAL EQUATION SHOWN BELOW?HOW MUCH HEAT IS EVOLVED WHEN 256 G OF 2SO2 (MOLAR... Read more

specific heat capacity
HOW MUCH HEAT IS REQUIRED TO RAISE THE TEMPERATURE OF 10 GRAM OF PIECE OF (AL) FROM 25 OC TO 35 OC (SPECIFIC HEAT CAPACITY OF ALUMINUM = 0.214 CAL/G) 214 14.2 4.12 21.4... Read more

Expriment 7: molar mass of volatale liquid
Give brief account on determination of molar mass of volatale liquid.... Read more

Melting point
The melting point temperature range of Pure Urea will be 3oC - 9oC Less than 5oC Liquid under 170 oC Between 120 oC to 135 oC... Read more

General Gas
Which one of the following equations is correct to calculate the moles PR = nVT RT = nPV nTR = PV VT = nRP... Read more

Heterogeneous mixture
Hydrated salt ( CaSO4.2H2O ) is named by old methode as Calcium sulfate di hydrate Calcium sulfate di water Calcium sulfate -2- hydrate Calcium sulfate -2- water... Read more

Heat of reaction
There are several kinds of " Heat of reaction " , Write 2 examples of them... Read more