Dear students, prepare for physics class 11th chapter one long questions. These important long questions are carefully added to get you best preparation for your 11th class physics ch. one exams.
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Question: 1
Describe law of mass action?
Answer: 1
1-4Law of mass reaction:
According to this law the rate at which a substance reacts is directly.
Proportional to its active mass and the rate of a reaction directly proportional to the product of the active masses of the reacting substances.
Derivation for equilibrium constant:
Consider the following reversible reaction:
A+B____kf_______ C+D
kr
Suppose (A) (B) (C) and (D) are moral concentration of A,B,C and D are respectively.
So, a
Rf * (A) (B)
Rf-Kf (A) (B)
Where Rf is rate of forward reaction while KF is a rate constant for forward reaction:
Similarly,
Rr * (C) (D)
Rr = Kr (C) (D)
where Rr is rate of reverse reaction while Kr is the rate constant for a reverse reaction.
At equilibrium state Rf=Rr
By putting the values of Eq 1 and 2 in Eq 3 we have
Kf (A) (B) = Kr (C) (D)
Kf = (C) (D)
Kr = (A) (B)
Kc = (C) (D)
(A) (B)
Kc is a equilibrium constant
Part 6( b)
Macroscopic Characteristics
Dynamic means reaction is still continuing. A few characteristics are given below.
Closed system:
Dynamic equilibrium is attain able only in close vessel because substances can neither leave nor enter in close system.
Concentration remain the same:
Amount of reactants and products do not change at equilibrium state.
Physical properties will not change:
physical properties like colour density etc remain the same.
Reaction does not stop:
Reaction will not cease in dynamic equilibrium forward and reverse reaction keep on talking place at the same rate but in opposite direction. it can be shown as:
Rates of forward _______ Rates of reaction Reverse reaction
Equilibrium can be established from either side.
An equilibrium state can be disturbed and again achieved under certain conditions of concentration pressure and temperature.