6: Thermodynamics

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

LibreTexts reference: Enzyme Thermodynamics

Identifying Energy Terms and Their Categories

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Which one of the following energy requirement categories correspond to the energy term 'spontaneous'.

• releases energy 
• requires energy input 

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Determining True/False Statements About Chemical Reactions

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

• Chemical reactions always transform one or more substances into one or more different substances. 
• Salt (NaCl) dissolving in water breaking the ionic bonds between Na⁺ and Cl^– is a physical reaction. 
• Chemical reactions only occur when energy is added. 
• Chemical reactions always involve the forming and breaking of chemical bonds 
• For chemical reactions to occur, the chemical identity of the substances must change. 

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Determining True/False Statements About Gibbs Free Energy (Delta G = Delta H - T Delta S)

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

• Tis the temperature in degrees Kelvin 
• entropy is associated with a state of disorder, randomness, or uncertainty 
• When ΔG > 0 the reaction is called non-spontaneous 
• ΔH is the change in enthalpy 
• When ΔH = 0 the reaction has reached equilibrium 

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Determining True/False Statements About Thermodynamics and Kinetics

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Which one of the following statements is TRUE of thermodynamics and kinetics?

• Dehydration reactions tend to increase entropy of the products. 
• The third law of thermodynamics states that the entropy of a system is conserved. 
• Enzymes change the standard Gibbs free energy change (ΔG°′) of a reaction. 
• Kinetics determines the direction of the reaction. 
• Enzymes do NOT affect the thermodynamics of a reaction. 

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