Questions & Answers

Question

Answers

(A) 1/16

(B) 16/1

(C) 1/8

(D) 8/1

Answer
Verified

We know that the rate law is given by

Rate(r) = k[A][B] (i)

Where A and B are reactants.

When volume is reduced by one fourth, then the concentration becomes 4 times. It is explained by the fact that concentration = number of moles/volume .And hence, concentration is inversely proportional to volume.

So, when volume is reduced by one fourth, then the concentration becomes 4 times.

Hence,${ r'\ =\ k[4A][4B]\\ \ \ =\ 16k[A][B]\\ \ \ =\ 16\ r } $ (râ€™ is the new rate)

(ii)

By dividing (i) and (ii), we will get:

$râ€™ = 16 r$

ie. rate of the reaction will become 16 times of the initial reaction rate.

Chemical kinetics is the branch of chemistry that deals with rate (speed/velocity) of a chemical reaction, factors influencing rate and mechanism.

Rate law is a mathematical equation that will give the actual rate of a chemical reaction in terms of concentration of reactants, raised to some powers, which may or may not be equal to the stoichiometric coefficients.Rate law is determined experimentally.

Factors affecting rate of reaction are:

(i) concentration

(ii) temperature

(iii) pressure

(iv) catalyst

(v) Surface area of reactant

(vi) Light in photochemical reactions.

Order of a reaction is the sum of powers of concentration terms in the rate law of a reaction. Order can be zero, integers or even fractional values.

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