مراجعة عامة على الكيمياء لغات ثانوية عامة -2015

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    is equal to ………………….

       A- 0.5 faraday                                                     B- faraday

       C- 3 faraday                                                        D- 0.3 faraday

4 – The oxygen gas ………………….

       A- 32 gram                                                          B – 6.02 ×10 23 molecules

       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 .

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   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

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مراجعة عامة على الكيمياء لغات ثانوية عامة -2015 91-625x314

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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.

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