Multiple Choice
Which statement is true regarding the energies involved in an endothermic reaction?
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8. Thermochemistry
Endothermic & Exothermic Reactions
Multiple Choice
Which of the following comparisons or contrasts between endergonic and exergonic reactions is false?
A
Exergonic reactions are non-spontaneous, while endergonic reactions are spontaneous.
B
Endergonic reactions require energy input to proceed, whereas exergonic reactions release energy.
C
Endergonic reactions have a positive Gibbs free energy change, while exergonic reactions have a negative Gibbs free energy change.
D
Endergonic reactions are associated with an increase in free energy, while exergonic reactions are associated with a decrease in free energy.
Verified step by step guidance1
Understand the definitions of endergonic and exergonic reactions. Endergonic reactions require an input of energy to proceed and are non-spontaneous, while exergonic reactions release energy and are spontaneous.
Recall the concept of Gibbs free energy change (ΔG). Endergonic reactions have a positive ΔG, indicating that they require energy input, whereas exergonic reactions have a negative ΔG, indicating that they release energy.
Consider the spontaneity of reactions. Spontaneous reactions occur without external energy input, which is characteristic of exergonic reactions. Non-spontaneous reactions require energy input, characteristic of endergonic reactions.
Analyze the statement: 'Exergonic reactions are non-spontaneous, while endergonic reactions are spontaneous.' This statement contradicts the definitions of endergonic and exergonic reactions.
Review the other statements: 'Endergonic reactions require energy input to proceed, whereas exergonic reactions release energy,' 'Endergonic reactions have a positive Gibbs free energy change, while exergonic reactions have a negative Gibbs free energy change,' and 'Endergonic reactions are associated with an increase in free energy, while exergonic reactions are associated with a decrease in free energy.' These statements are consistent with the definitions of endergonic and exergonic reactions.
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