1. No category

‫كيمياء لغات‬
‫مراجعة عامة‬
(Write all the chemical equations balanced , mention the conditions of the reaction)
Answer four questions only from the following
 Question (1) :
 First :
Choose the correct answer for each of the following:
1- Benzene reacts with chlorine in direct sun light giving 
A- cyclio hexane
B- normal hexane
C- gamixane
D- chlorobenzene
2 - The law which controls the relation between the velocity of the chemical reaction and the
concentration of reactants is discovered by 
A- Le chatelier
B- Avogadro
C- Gay lussac
D- Guldberg and waage
3 - The quantity of electricity needed to precipitate ( deposit ) one gram/atom of aluminum
in the reaction : Al+3 + 3e  Al0
A- 0.5 faraday
C- 3 faraday
4 - The oxygen gas 
is equal to 
B- faraday
D- 0.3 faraday
B - 6.02 ×10 23 molecules
A- 32 gram
C- 2 (6.02 ×10 23 ) atoms
D- occupies 22.4 litre
E- all previous
5 - o.001 molar solution of hydrochloric acid has a PH value equals 
A- 3
B- 1
C- zero
D- 11
 Second :
A) Compare between each of the following :
1 - Chemical equilibrium and ionic equilibrium .
2 - Addition polymerization and condensation polymerization .
3 - Avogadro ,s law and gay lussac law .
4 - Dry cell and mercury cell .
B) write the names of the following compounds according to the IUPAC system
1- CH3  CH  CH2  CH2
OH
2- CH3  CH  CH2  CH3
CH3
C2H5
3- CH3  CH2  CH2
4- CH3  C  C  CH  CH3
CH2  CH3
C = CH2
CH3  CH2
NO2
O
5- CH3  CH  CH  C  OH
6-
CH3 CH3
Cl
1
 Third :
A) Write the symbolic representation, the oxidizing agent , reducing agent
and the electromotive force ( e.m.f. )of the following galvanic cell :
H20 + Cu+2  2H+ + Cu0
Provided that the oxidation potential of copper is ( -0.34 ) volt
B) Explain briefly the following :
The rate of the chemical reaction and the factors affecting it .
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Model Answer
 QUESTION 1 :
First : Choose the correct answer for the following :
1- Gamixane
2- Guldberg and waage
4- all previous
5- 3
3- 3 Faraday
Second : A- Compare between each of the following :
1- Chemical Equilibrium
Ionic Equilibrium
It is a state of equilibrium in the reversible
reaction at which the rate of forward reaction
equals the rate of backward reaction.
It is the equilibrium arising between molecules
of a weak electrolyte and the ions resulting from
it .
Ex :
CH3COOH +C2H5OH
Ex :
CH3COO + (H3O)+
CH3COOC2H5 + H2O CH3COOH + H2O
2- Addition Polymerization
Condensation Polymerization
It takes place by adding a huge number of
unsaturated small molecules to each other to
form a very large molecule .
It takes place between two different monomers
and accompanied by losing a simple molecule
such as water to from copolymer which
continues the polymerization process.
Ex(1)
H H
n
C=C
H H
Ex
H H
Cat. Pressure
CC 
Temp.
H H
Ethylene
H
OH
n
H
Poly ethylene
n
C=C
H Cl
Vinyl chloride
Temp.
H
 H2O
O
H H
Cat. Pressure
OH
C
||
Ex(2)
H H
H
OH
 CC 
H
Cl
OH
CH2
Copolymer
n
Poly Vinyl chloride
P.V.C
Bakelite
3- Avogadro's law
Gay Lussac's law
The Volumes of gases involved in a reaction
Equal volumes of gases under the same
pressure and temperature cantain equal numbers and the gases produced are exist in fixed
ratios
of molecules.
P.O.C
1-The cell type:
2-Anode
3-Cathode
4-electrolyte
5-E.M.F
6- The Total reaetion
4- Dry cell
Primary cell
Zinc
Graphite rod
Ammonium chloride
1.5 volt
Zn + 2MnO2 + 2NH4+ 
Zn+2 + 2 MnO (OH) + 2NH3
Mercury Cell
Primary
Zinc
Mercury oxide
Potassium hydroxide
1.35 volt
Zn + HgO
 ZnO + Hg
B- Write the names of the following Compounds according to the IUPAC system :
1) 2- Pentanol
2) 3- methyl pentane
3) 2- ethyl -1- pentene
4) 4- methyl -2- hexyne
5) 2, 3- dimethyl butanoic acid
6) 1- chloro -4- Nitro benzene
Reduction
 Third : A- problem
H20
+
Cu+2
  2H+ + Cu0
oxidation
1- The oxidizing agent is
:
Gopper
2- The reducing agent is
:
Hydrogen
3- The Anode is
:
Hydrogen
4- The Cathode is
:
Copper
5- The cell Digram
:
H2 2H+pt Cu+2 Cu 0
6- The electromotive Force (e.m.f) = Oxidation potential of Anode – oxidation potential of cathode
= Zero – ( - 0.34 ) = + 0.34 volt
Spontenlus reaction
Generate electric current
Direetion of current .
From the anode to cathode.
B- Explain briefly the following :
The rate of chemical reaction : the change in Concentration of reactants or proudest per unit
time.
The factors affecting the rate of chemical reactions .
1 Nature of reactants :
Type of bonding in the reactants : Ionic reactants undergo very fast reactions.
While covalent bonded reactants undergo slow reactions.
2 Concentration while of reactants : the larger the number of reacting molecules the greater
the chance of collision and the greater of reaction rate.
3 Temperature : A raise in temperature causes an increase in the proportion of activated
molecules and consequently an increase in the rate of chemical reaction .
4- Increasing the pressure an the gaseous system : the reaction under equilibrium, a
shift in the direction whose volume is less.