6: Thermodynamics

Enzyme functions, substrate binding, and energy changes in reactions.

LibreTexts reference: Enzyme Thermodynamics

Energy Terms and Their Categories

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Which one of the following energy requirement categories correspond to the energy term 'breaking down polymers'.

• releases energy 
• requires energy input 

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True/False Statements on Chemical Reactions

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Which one of the following statements is FALSE regarding chemical reactions?

• For chemical reactions to occur, the chemical formulas of both the reactant and the product can be the same. 
• Chemical reactions are always either exothermic or endothermic. 
• Chemical reactions always transform one or more substances into one or more different substances. 
• Chemical reactions always involve a change in the chemical composition of substances. 
• Salt (NaCl) dissolving in water is a chemical reaction since breaking ionic bonds forms in new chemicals. 

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True/False Statements on Gibbs Free Energy (ΔG = ΔH - T ΔS)

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Which one of the following statements is TRUE concerning the Gibbs free energy, ΔG = ΔH – TΔS?

• entropy can be described as the energy available to do work 
• ΔS is the change in enthalpy 
• Tis the temperature in degrees Celcius 
• When ΔG < 0 the reaction is calledspontaneous 
• When ΔH = 0 the reaction has reached equilibrium 

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True/False Statements on Thermodynamics vs. Kinetics

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Which one of the following statements is FALSE concerning thermodynamics and kinetics?

• Enzymes do NOT change the overall change in free energy (ΔG) of a reaction. 
• Thermodynamics determines the direction a reaction will proceed under specific conditions. 
• The change in Gibbs free energy (ΔG) of a reaction is related to the enthalpy and entropy changes of the reaction. 
• The third law of thermodynamics states that the entropy of a system is conserved. 
• Enzymes change the rate of a reaction. 

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