Textbook Question
Imagine that you are climbing a mountain. (a) Is the distance you travel to the top a state function?
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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 4a
The contents of the closed box in each of the following illustrations represent a system, and the arrows show the changes to the system during some process. The lengths of the arrows represent the relative magnitudes of q and w. (a) Which of these processes is endothermic?
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Identify the terms: 'q' represents heat, and 'w' represents work. In thermodynamics, a process is endothermic if the system absorbs heat from the surroundings, meaning q is positive.
Examine the arrows: The length of the arrow labeled 'q' indicates the magnitude of heat transfer. A longer arrow pointing into the system suggests a larger amount of heat absorbed.
Compare the arrows: Look for the process where the arrow for 'q' is longer and points into the system, indicating a positive q value.
Consider the direction: Ensure that the arrow for 'q' is directed into the system, as this signifies an endothermic process.
Conclude: Identify the process with the characteristics of an endothermic reaction, where the system absorbs heat, indicated by a positive q value.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Endothermic Processes
An endothermic process is one that absorbs heat from its surroundings, resulting in a decrease in the temperature of the surroundings. In such processes, the system gains energy, typically in the form of heat (q > 0). Common examples include melting ice or evaporating water, where energy is required to break intermolecular bonds.
Heat (q) and Work (w)
In thermodynamics, heat (q) refers to the energy transferred due to temperature differences, while work (w) is the energy transferred when a force is applied over a distance. The signs of q and w indicate the direction of energy transfer: positive q means heat is absorbed by the system, and positive w means work is done on the system. Understanding these concepts is crucial for analyzing energy changes in a system.
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Thermodynamic Diagrams
Thermodynamic diagrams visually represent changes in a system, often using arrows to indicate the direction and magnitude of heat and work. The length of the arrows correlates with the amount of energy transferred, helping to identify whether a process is endothermic or exothermic. Analyzing these diagrams allows for a clearer understanding of the energy dynamics involved in various processes.
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Related Practice
Textbook Question
The accompanying photo shows a pipevine swallowtail caterpillar climbing up a twig. (a) As the caterpillar climbs, its potential energy is increasing. What source of energy has been used to effect this change in potential energy?
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Textbook Question
Consider the accompanying energy diagram. (a) Does thisdiagram represent an increase or decrease in the internal energyof the system?
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Textbook Question
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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