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CHEMICAL REACTIONS - ΔG = ΔH TΔS ΔG = change in free...

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CHEMICAL REACTIONS: When two or more atoms, ions, or molecules collide in such a way that they produce a new substance. * All chemical reactions are governed by the laws of Thermodynamics, 1st 2nd Types of Chemical Reactions (Spontaneous versus Non-spontaneous) Spontaneous reaction is one which can occur without outside help. (Exergonic) Non-spontaneous reaction needs outside help. (Endergonic) Free Energy (G) Energy "free" and available to do useful work in the cell in all spontaneous reactions: ΔG- (free energy in the systems decreases) exergonic in all non-spontaneous reactions: ΔG+ (increases) endergonic therefore the question of interest to us: is ΔG (+ or -) ??
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Unformatted text preview: ΔG = ΔH - TΔS ΔG = change in free energy ΔH = change in enthalpy T = temperature Kelvin ΔS = change in entropy Chemical Reactions in living systems Maintenance and reproduction of living systems requires chemical reactions in cells 1) Chemical reactions in. .. non-living world living systems 2) In living systems this is accomplished by * External energy source * Organic catalysts: ENZYMES: Structure Function MODEL OF ACTIVITY: General Model of Enzyme catalysis: Specific Model of Enzyme Catalysis: Induced-fit Hypothesis ENZYME REGULATION: Competitive inhibition: Non-Competitive Inhibition: Allosteric Inhibition:...
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