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 Measurement177
- Ch.2 - Atoms, Molecules, and Ions231
- Ch.3 - Chemical Reactions and Reaction Stoichiometry216
- Ch.4 - Reactions in Aqueous Solution189
- Ch.5 - Thermochemistry175
- Ch.6 - Electronic Structure of Atoms168
- Ch.7 - Periodic Properties of the Elements150
- Ch.8 - Basic Concepts of Chemical Bonding177
- Ch.9 - Molecular Geometry and Bonding Theories200
- Ch.10 - Gases179
- Ch.11 - Liquids and Intermolecular Forces113
- Ch.12 - Solids and Modern Materials154
- Ch.13 - Properties of Solutions157
- Ch.14 - Chemical Kinetics199
- Ch.15 - Chemical Equilibrium128
- Ch.16 - Acid-Base Equilibria164
- Ch.17 - Additional Aspects of Aqueous Equilibria163
- Ch.18 - Chemistry of the Environment105
- Ch.19 - Chemical Thermodynamics164
- Ch.20 - Electrochemistry171
- Ch.21 - Nuclear Chemistry122
- Ch.22 - Chemistry of the Nonmetals82
- Ch.23 - Transition Metals and Coordination Chemistry79
- Ch.24 - The Chemistry of Life: Organic and Biological Chemistry16
Brown14th EditionChemistry: The Central ScienceISBN: 9780134414232Not the one you use?Change textbook
Chapter 5, Problem 3
Consider the accompanying energy diagram. (a) Does thisdiagram represent an increase or decrease in the internal energyof the system?
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Observe the energy diagram provided.
Note the positions of the reactants and products on the diagram.
Identify the direction of the arrow indicating the change in internal energy.
Determine whether the arrow points downward or upward.
Conclude whether the internal energy of the system increases or decreases based on the direction of the arrow.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Internal Energy
Internal energy is the total energy contained within a system, including kinetic and potential energy of the particles. It is a state function, meaning it depends only on the current state of the system, not on how it got there. Changes in internal energy can indicate whether a reaction is endothermic or exothermic.
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00:40
Internal Energy
Energy Diagrams
Energy diagrams visually represent the energy changes during a chemical reaction. The vertical axis typically shows internal energy, while the horizontal axis represents the progress of the reaction. The difference in energy between reactants and products indicates whether energy is absorbed or released during the reaction.
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01:57Energy Diagrams
Exothermic vs. Endothermic Reactions
Exothermic reactions release energy to the surroundings, resulting in a decrease in the internal energy of the system, while endothermic reactions absorb energy, leading to an increase in internal energy. In the context of the provided energy diagram, a downward arrow from reactants to products signifies an exothermic reaction, indicating a decrease in internal energy.
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02:30Endothermic & Exothermic Reactions
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
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?
Textbook Question
Two positively charged spheres, each with a charge of 2.0⨉10-5 C, a mass of 1.0 kg, and separated by a distance of 1.0 cm, are held in place on a frictionless track. (a) What is the electrostatic potential energy of this system?
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Textbook Question
Imagine that you are climbing a mountain. (b) Is the change in elevation between your base camp and the peak a state function?
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