General Science • ChemistryHard
In the context of chemical kinetics, what does the molecularity of a reaction represent?
A. The exponent of concentration terms in the experimentally determined rate law expression
B. The number of reacting species colliding simultaneously in an elementary step to bring about a chemical reaction✓ Correct Answer
C. The total number of atoms present in one molecule of the final reaction product
D. The overall order of a complex reaction determined by summing all stoichiometric coefficients
💡 Solution & Explanation
Molecularity refers strictly to the number of reactant molecules, ions, or atoms that come together in an elementary reaction step to form products, and it is always a whole number typically not exceeding three. Unlike reaction order, which is an experimental quantity that can be fractional or zero, molecularity is a theoretical concept applicable only to elementary reactions. For complex multi-step reactions, overall molecularity has no physical meaning since the reaction proceeds through a sequence of elementary stages.
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