Chemical Thermodynamics

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Created by: Broken Rose
Created on: 14-12-14 04:54

In terms of the system - change in H > 0 - means...

That the system has lost energy (endothermic)

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What is the mathematical expression of the first law?

Change in U = Q + W

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What is the pressure volume work done ON a system equation?

Change in U = Q + p(Change in V)

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If Pressure volume work is done BY the system and heat is absorbed then the equation will be?

Change in U = Change in Enthalpy - p(Change in V)

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Why does in liquids the Change in U approximately equals to Change in H when volume pressure work occcurs?

Because pressure in liquids is negligible

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What is the difference between Macrostate and microstate of a system?

Macrostate is defined by parameters (eg.pressure, temp, number of phases) and microstate is defined by thermodynamics (the position and velocity of the particles and distribution of energy between them)

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What does Gibbs energy express?

it expresses the energy that can be converted during a chemical reaction to useful (non pressure volume) work

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Change in G > 0 means ...

The reaction is endergonic (requires energy from surrounding to proceed)

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If Q

Change in Gibbs < 0 And the reaction will go from left to right (spontaneous)

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What is a catabolic pathway in terms of Gibbs energy?

Change in Gibbs < 0 exergonic pathways eg degradation of nutrients to obtain available energy

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Other cards in this set

Card 2

Front

What is the mathematical expression of the first law?

Back

Change in U = Q + W

Card 3

Front

What is the pressure volume work done ON a system equation?

Back

Card 4

Front

If Pressure volume work is done BY the system and heat is absorbed then the equation will be?

Back

Card 5

Front

Why does in liquids the Change in U approximately equals to Change in H when volume pressure work occcurs?

Back

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Chemical Thermodynamics