Ch.5 - Thermochemistry

Brown - Chemistry: The Central Science 15th Edition

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Brown 15th Edition

Ch.5 - Thermochemistry

Problema 8a

Capitolo 5, Problema 8a

In the accompanying cylinder diagram, a chemical process occurs at constant temperature and pressure. (a) Is the sign of w indicated by this change positive or negative?

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insert step 1> Identify the type of process occurring in the cylinder. Since the process occurs at constant temperature and pressure, it is likely an isothermal process.

insert step 2> Recall that work (w) in thermodynamics is related to the expansion or compression of gases. In an isothermal process, work is done by or on the system.

insert step 3> Determine the direction of the process. If the gas expands, it does work on the surroundings, and if it is compressed, work is done on the gas.

insert step 4> Use the sign convention for work: If the system does work on the surroundings (expansion), w is negative. If work is done on the system (compression), w is positive.

insert step 5> Based on the direction of the process (expansion or compression), determine the sign of w.

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Work (w) in Thermodynamics

In thermodynamics, work (w) refers to the energy transferred when a force is applied over a distance. The sign of work is determined by the direction of energy transfer: positive work indicates that the system is doing work on the surroundings, while negative work means that work is done on the system by the surroundings.

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Percorso guidato

00:51

First Law of Thermodynamics

Constant Temperature and Pressure

A process occurring at constant temperature and pressure is known as an isothermal and isobaric process, respectively. In such conditions, the system's internal energy remains constant, and any energy change is associated with work done or heat exchanged, which influences the sign of work.

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01:08

Standard Temperature and Pressure

First Law of Thermodynamics

The First Law of Thermodynamics states that energy cannot be created or destroyed, only transformed. It relates the change in internal energy of a system to the heat added to the system and the work done by the system, expressed as ΔU = Q - w. Understanding this relationship is crucial for determining the sign of work in a given process.

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Percorso guidato

01:18

First Law of Thermodynamics

Pratica correlata

Domanda del libro di testo

Imagine a container placed in a tub of water, as depicted in the accompanying diagram. (a) If the contents of the container are the system and heat is able to flow through the container walls, what qualitative changes will occur in the temperatures of the system and in its surroundings? From the system's perspective, is the process exothermic or endothermic?

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Domanda del libro di testo

The diagram shows four states of a system, each with different internal energy, E. (c) Write an expression for the difference in energy between State C and State D.

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Domanda del libro di testo

Consider the two diagrams that follow. (d) Would similar relationships hold for the work involved in each process?

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Domanda del libro di testo

The diagram shows four states of a system, each with different internal energy, E. (a) Which of the states of the system has the greatest internal energy?

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Domanda del libro di testo

(b) Why does increasing the temperature cause a solid substance to change in succession from a solid to a liquid to a gas?

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