Asked by Samantha Abbott on Jul 31, 2024
Verified
Which of the following is true for the initiation step of a free radical chlorination reaction?
A) ΔH° > 0 and ΔS° > 0
B) ΔH° > 0 and ΔS° < 0
C) ΔH° < 0 and ΔS° > 0
D) ΔH° < 0 and ΔS° < 0
E) ΔH° = 0 and ΔS° = 0
Initiation Step
The first step in a chain reaction, where reactive intermediates are produced that propagate the reaction.
Free Radical Chlorination
A chemical reaction where chlorine atoms generated from molecular chlorine initiate a radical chain reaction leading to the chlorination of hydrocarbons.
ΔH°
The standard enthalpy change, indicating the heat absorbed or released in a reaction at standard conditions (1 atm, 298 K).
- Elucidate the principles of enthalpy (ΔH°), entropy (ΔS°), and Gibbs free energy (ΔG°) within the framework of chemical reactions.
Verified Answer
ZK
Zybrea KnightAug 06, 2024
Final Answer :
A
Explanation :
The initiation step of a free radical chlorination reaction involves breaking the chlorine-chlorine bond using UV light or heat, which requires energy and results in an increase in entropy due to the formation of two chlorine radicals. Therefore, ΔH° and ΔS° both have positive values, making choice A the correct answer.
Learning Objectives
- Elucidate the principles of enthalpy (ΔH°), entropy (ΔS°), and Gibbs free energy (ΔG°) within the framework of chemical reactions.