Ch.5 - Thermochemistry

Problem 23a

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Chapter 5, Problem 23a

(a) According to the first law of thermodynamics, what quantity is conserved?

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

First Law of Thermodynamics

The First Law of Thermodynamics, also known as the law of energy conservation, states that energy cannot be created or destroyed in an isolated system. Instead, energy can only be transformed from one form to another. This principle is fundamental in understanding how energy flows in physical and chemical processes.

Internal Energy

Internal energy is the total energy contained within a system, including kinetic and potential energy at the molecular level. According to the First Law of Thermodynamics, any change in the internal energy of a system is equal to the heat added to the system minus the work done by the system on its surroundings. This concept is crucial for analyzing thermodynamic processes.

Work and Heat

In thermodynamics, work and heat are two ways energy can be transferred between a system and its surroundings. Work refers to energy transfer that occurs when a force is applied over a distance, while heat is the energy transferred due to a temperature difference. Understanding these concepts is essential for applying the First Law of Thermodynamics to real-world scenarios.

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Heat Capacity

Related Practice

A magnesium ion, Mg²⁺, with a charge of 3.2⨉10^-19 C and an oxide ion, O2-, with a charge of -3.2⨉10^-19 C, are separated by a distance of 0.35 nm. How much work would be required to increase the separation of the two ions to an infinite distance?

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Textbook Question

In a thermodynamic study, a scientist focuses on the properties of a solution in an apparatus as illustrated. A solution is continuously flowing into the apparatus at the top and out at the bottom, such that the amount of solution in the apparatus is constant with time. (a) Is the solution in the apparatus a closed system, open system, or isolated system?

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Textbook Question

In a thermodynamic study, a scientist focuses on the properties of a solution in an apparatus as illustrated. A solution is continuously flowing into the apparatus at the top and out at the bottom, such that the amount of solution in the apparatus is constant with time. (b) If the inlet and outlet were closed, what type of system would it be

Calculate ΔE and determine whether the process is endothermic or exothermic for the following cases: (a) q = 0.763 kJ and w = -840 J.

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Textbook Question

For the following processes, calculate the change in internal energy of the system and determine whether the process is endothermic or exothermic: (a) A balloon is cooled by removing 0.655 kJ of heat. It shrinks on cooling, and the atmosphere does 382 J of work on the balloon.

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