Textbook Question
(c) By what means can the internal energy of a closed system increase?
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Ch.5 - Thermochemistry
Brown14th EditionChemistry: The Central ScienceISBN: 9780134414232
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Table of contents
- Ch.1 - Introduction: Matter, Energy, and Measurement140
- Ch.2 - Atoms, Molecules, and Ions192
- Ch.3 - Chemical Reactions and Reaction Stoichiometry172
- Ch.4 - Reactions in Aqueous Solution156
- Ch.5 - Thermochemistry151
- Ch.6 - Electronic Structure of Atoms137
- Ch.7 - Periodic Properties of the Elements127
- Ch.8 - Basic Concepts of Chemical Bonding143
- Ch.9 - Molecular Geometry and Bonding Theories167
- Ch.10 - Gases147
- Ch.11 - Liquids and Intermolecular Forces97
- Ch.12 - Solids and Modern Materials129
- Ch.13 - Properties of Solutions126
- Ch.14 - Chemical Kinetics175
- Ch.15 - Chemical Equilibrium107
- Ch.16 - Acid-Base Equilibria127
- Ch.17 - Additional Aspects of Aqueous Equilibria133
- Ch.18 - Chemistry of the Environment88
- Ch.19 - Chemical Thermodynamics140
- Ch.20 - Electrochemistry137
- Ch.21 - Nuclear Chemistry99
- Ch.22 - Chemistry of the Nonmetals66
- Ch.23 - Transition Metals and Coordination Chemistry69
- Ch.24 - The Chemistry of Life: Organic and Biological Chemistry11
Brown14th EditionChemistry: The Central ScienceISBN: 9780134414232Not the one you use?Change textbook
Chapter 5, Problem 23a
(a) According to the first law of thermodynamics, what quantity is conserved?
Verified step by step guidance1
The first law of thermodynamics is a version of the law of conservation of energy, adapted for thermodynamic systems.
It states that energy cannot be created or destroyed in an isolated system.
The first law is often expressed as \( \Delta U = Q - W \), where \( \Delta U \) is the change in internal energy of the system, \( Q \) is the heat added to the system, and \( W \) is the work done by the system.
According to this law, the total energy of an isolated system is constant.
Therefore, the quantity that is conserved according to the first law of thermodynamics is energy.
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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.
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01:18
First Law of Thermodynamics
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.
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00:40Internal Energy
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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02:19Heat Capacity
Related Practice
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
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Textbook Question
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
(b) What is meant by the internal energy of a system?