Quiz 1: chapter3:Chemical equilibrium

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chapter3:chemical Equilibrium Quiz1

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(1) Equilibrium system is described as dynamic because

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(2) The reaction of hydrochloric acid with magnesium is a complete reaction because

       

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(3) --------- is a one of the instantaneous reactions.

 

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(4)----------  is a one of the comparatively slow reactions.

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(5) The solution of the reaction of acetic acid with ethyl alcohol turns litmus paper red because

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(7) The opposite figure represents -----

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20) The Kc of the reaction:

SnO2+2CO(g)  ↔    Sn(s)+2CO2(g)

Is   ------------------------- 

(a) Kc= [CO₂] / [CO]   

(b.) Kc= [CO2]2 /  [CO]2

(c) Kc= [Sn].[CO₂]² / [SnO2][CO2]2  

(d) Kc= [Sn] [CO2]²  / [CO]2

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(19) The rate of a <a href="https://gogoacademy.net/science-for-primary-4th-final-revision-for-primary-4/">chemical</a> reaction:

Zn(s) + 2HCl(g)   ↔  ZnCl2(aq) +H2(g) 

is measured by changing in-------------------

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(18) When temperature of the following reaction:

H₂+I2   ↔   2HI                

is raised, the increasing in K1, is less than that of K,2. So, the equilibrium constant  Kc ------------

 

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(17) From the Kc value of the reaction:

2SO3(g)     ↔   2SO2(g)+O2 , Kc=1.2x10-4

we can conclude that -----------

 

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(16) From the Kc value for the reaction:

H2(g) + Cl2(g)   ↔  2HCl(g)  .Kc=4.4 × 1032

we can conclude that ------

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(11) -------  established a law expressing the relationship between the rate of the <a href="https://gogoacademy.net/science-for-primary-4th-final-revision-for-primary-4/">chemical</a> reaction and concentration of the reactants.

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(12) The <a href="https://gogoacademy.net/science-for-primary-4th-final-revision-for-primary-4/">chemical</a> reaction is in equilibrium when --------

    

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(13) In the following equilibrium reaction:

FeCl3(aq)  +3NH SCN(aq)    Fe(SCN)3(aq) + 3NH4Cl(aq)

The rate of reversible reaction is expressed by --------

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(14) K1/K2  for an equilibrium reaction is known as K

 

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(15) When the value of equilibrium constant is high, it means that ---------

 

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(8) Each of the following affects the <a href="https://gogoacademy.net/science-for-primary-4th-final-revision-for-primary-4/">chemical</a> equilibrium except the ---------    if the volumes of reactants and products are different.

 

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(9) The reaction:

N2(g) + 3H2(g)    =    2NH3(g)       (N=14, H=1]

reaches the equilibrium state when are present in a closed flask. (at S.T.P)

 

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(10) In the reaction: Vegetable oil +H2(g)  in presence of  Ni /Δ →    Margarine (artificial fat)

the nickel used is preferred to be in the form of ......

 

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(29) On increasing the reactants concentrations of a reaction under equilibrium, a shift in the direction of --------

takes place.

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(21) The concentration of reactants equals the concentration of products at the equilibrium reaction reaction --------

a)Na2O4(g)  ↔  2NO2(g)       Kc=0.71

b)H+(aq)  +OH-(aq)  ↔ H2O(l)    Kc= 1x 10 14

c)CO2(g) +H2(g)  ↔  CO(g)+ H2O(v) Kc=0.297

d.)SnO2(s) +2H2(g)  ↔ Sn(s)+2H2O(v)  Kc=1                

 

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(28) On increasing the pressure on a gaseous reaction under equilibrium, a shift in the direction of -------------takes place.

 

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(27) by increasing the reaction temperature 10°C

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(26) The Kc value of the reaction changes when -----

 

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(25) The concentration of gases is preferable to expressed by

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(24) The orange colour turns yellow on adding --------   to the follwing reaction:

  2CrO42- (aq)    + 2H3O+(aq)  ↔  Cr2O72- + 3H2O(l)

  Yellow                                               orange

(a) KNO3         (b.) NaOH       

(c)NH4NO3    (d)CH3COOH

 

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(23) The Kc value equals Kp for the reaction

(a) PCl5(g)    ↔  PCl3(g) +Cl2(g)

(b)2SO2(g)+O2(g)   ↔        2SO3(g)

(c.) H2(g) + I2(g)     ↔      2HI(g)

(d) N2(g) +3H2(g)   ↔     2NH3(g)

 

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(22) Which of the following changes increases the <a href="https://gogoacademy.net/science-for-primary-4th-final-revision-for-primary-4/">kinetic</a> <a href="https://gogoacademy.net/science-prep-1-final-revision/">energy</a> of the reactant molecules ? -------------------

(a) The decreasing of concentration

(b.) The increasing of temperature.

(c) The increasing of surface area.   

(d) The increasing of concentration.

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