Multiple Choice
If, during a process, the system becomes more ordered, then __________.
7. Energy and Metabolism
Chemical Reactions
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What do the sign and magnitude of the ΔG of a reaction tell us about the speed of the reaction? and
A
The sign determines whether the reaction is spontaneous, and the magnitude determines the speed.
B
The sign does not matter, but the larger the magnitude of ΔG, the faster the reaction.
C
The sign does not matter, but the smaller the magnitude of ΔG, the faster the reaction.
D
The more negative the ΔG, the faster the reaction is.
E
Neither the sign nor the magnitude of ΔG has anything to do with the speed of a reaction.
Verified step by step guidance1
Understand the concept of Gibbs free energy (ΔG): Gibbs free energy is a thermodynamic quantity that can predict whether a reaction will occur spontaneously under constant temperature and pressure.
Interpret the sign of ΔG: A negative ΔG indicates that a reaction is spontaneous, while a positive ΔG suggests that a reaction is non-spontaneous.
Consider the magnitude of ΔG: The magnitude of ΔG does not provide information about the speed of the reaction. It only indicates how far the reaction is from equilibrium.
Differentiate between thermodynamics and kinetics: Thermodynamics, which includes ΔG, tells us if a reaction is favorable, but kinetics, which involves activation energy and reaction rates, determines the speed of the reaction.
Conclude the relationship between ΔG and reaction speed: Neither the sign nor the magnitude of ΔG directly affects the speed of a reaction. Reaction speed is determined by kinetic factors, not thermodynamic ones.
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