Quiz 1: chapter3:Chemical equilibrium

(1) Equilibrium system is described as dynamic because

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

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

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

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

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

20) The Kc of the reaction:

SnO₂+2CO_(g)  ↔    Sn_(s)+2CO_2(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

(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)   ↔  ZnCl_2(aq) +H_2(g) 

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

(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 ------------

(17) From the Kc value of the reaction:

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

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

(16) From the Kc value for the reaction:

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

we can conclude that ------

(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.

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

(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 --------

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

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

(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.

(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)

(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 ......

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

takes place.

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

a)Na₂O_4(g)  ↔  2NO_2(g)       Kc=0.71

b)H⁺_(aq)  +OH^-_(aq)  ↔ H₂O_(l)    Kc= 1x 10 ¹⁴

c)CO_2(g) +H_2(g)  ↔  CO_(g)+ H₂O_{(v) Kc=0.297}

d.)SnO_2(s) +2H_2(g)  ↔ Sn_(s)+2H₂O_(v)  Kc=1                

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

(27) by increasing the reaction temperature 10°C

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

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

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

  2CrO₄^2- _(aq)    + 2H₃O⁺_(aq)  ↔  Cr2O₇^2- + 3H₂O_(l)

  Yellow                                               orange

(a) KNO₃         (b.) NaOH       

(c)NH₄NO₃    (d)CH₃COOH

(23) The Kc value equals Kp for the reaction

(a) PCl_5(g)    ↔  PCl_3(g) +Cl_2(g)

(b)2SO_2(g)+O_2(g)   ↔        2SO_3(g)

(c.) H_2(g) + I_2(g)     ↔      2HI_(g)

(d) N_2(g) +3H_2(g)   ↔     2NH_3(g)

(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.