Chemistry - Chemical Kinetics Question with Solution | TestHub
The rate of a chemical reaction is significantly affected by a change in temperature. For most chemical reactions, the rate usually doubles or triples for each 10°C rise in temperature. This occurs because an increase in temperature increases the number of effective collisions. Consequently, the fraction of molecules possessing energy greater than or equal to the threshold energy increases appreciably, resulting in a significant increase in the reaction rate. The quantitative dependence of reaction rate on temperature is given by the Arrhenius equation:
In this equation, is the activation energy of the reaction. (antilog 0.3931 = 2.472)
In some cases it is found that a large number of colliding molecules have energy more than the threshold value, yet the reaction is slow. This is due to the fact that
Options:
Answer:
Solution:
order of reaction is an experimentally determined quantity. It may be zero, positive, negative, or fractional. The kinetic equation for an nᵗʰ order reaction is:
half-life of an nᵗʰ order reaction depends on the initial concentration according to the following relation:
unit of the rate constant varies with the order, but the general relation for the unit of nᵗʰ order reaction is:
The differential rate law for an nᵗʰ order reaction may be given as:
where A denotes the reactant.
