GENERAL CHEMISTRY IT SP 2017 ASSIGNMENT 5 CHEMICAL EQUILIBRIUM Name MULTIPLE CHO

Question

GENERAL CHEMISTRY IT SP 2017 ASSIGNMENT 5 CHEMICAL EQUILIBRIUM Name MULTIPLE CHOICE. Choose the one alternative that best completes the statementur answers the question. 1) If a reaction begins with only products present, how will the position of the equilibrium be A) There will be more Products present than if the reaction begins with only reactants. H Equilibrium cannot be approached beginning with only the products of the reantien. The composition will be the same as it would be if the neaction began with only reactants. D) There will be more reactants present than if the reactien began with only the reactants, 2) How is it possible to tell if equilibrium has been achieved? A) The composition of the system is no longer changing. B) The rate of the forward ruacticm has demeased to zero, The conoentration of one of the reactants becomes zero, D) All of the reactants are converted to preduct Why is the reverse reaction very skow at the beginning of a reaction when there are initially only reactants present? A) The product molecules present don't collide very often. B) The molecules of the Product cannot react. C)The rate constantfor the reverse reaction is very small. D The reaction in forward direction is occurring rapidly. Achemical reaction has an equilibrium consuanl of36. 106. What will be true about the system when equilibrium A) The product concentration will be muuh larger than the reactant excentration. B) The product concentra ill be much smaller than the reartantconcentration. tion wi C There will be significant concentrations cd both reactants and products. D There will be more reactents than productspresent at equilibrium. 50 A chemical reaction has an equilibrium constant of 102. What will be true about the syslem 5) hen equilibrium is A The reaction goes t completion. The reactants are not converted to products. C) There is very little neaction. D) The reaction occu but not to oumpletson.

Explanation / Answer

1) the composition will be the same as if the reaction starts with only reactant present.

Reason: in equilibrium reactions the reaction proceed both in forward and backward direction

2) at equilibrium the composition of the system is no longer changing

Reason: at equilibrium the rate of forward reaction becomes equal to backward reaction

3) the rate constant for reverse reaction is very low

4) The product concentration will be much larger than the reactant concentration

REason equilibrium constant = product of concentration of products / product of concentration of reactants

So, higher the equilibrium constant value, more the concentration of product in the system

5) The reaction will occur but not to completion

6) The equilibrium constant for first reaction = K1 = 0.0168

The equilibrium constant for second reaction = K2 = (K1)^1/2 = 0.1296

7) the concentration of solids does not vary

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