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Multiple Choice
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 guidance
1
Understand that ΔG, or Gibbs free energy change, is a thermodynamic property that indicates the spontaneity of a reaction, not its speed.
Recognize that the sign of ΔG tells us whether a reaction is spontaneous (negative ΔG) or non-spontaneous (positive ΔG) under constant temperature and pressure.
Acknowledge that the magnitude of ΔG indicates how far a reaction is from equilibrium, but it does not provide information about the reaction rate.
Realize that the speed of a reaction is determined by kinetic factors, such as activation energy and the presence of catalysts, rather than thermodynamic factors like ΔG.
Conclude that neither the sign nor the magnitude of ΔG directly affects the speed of a reaction, as they are related to thermodynamic feasibility, not kinetics.