Domanda del libro di testo
Indicate whether each statement is true or false. (b) Exothermic reactions are faster than endothermic reactions.
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Ch.14 - Chemical Kinetics
Brown15th EditionChemistry: The Central ScienceISBN: 9780137542970
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TOC.tableOfContents
- Ch.1 - Introduction: Matter, Energy, and Measurement146
- Ch.2 - Atoms, Molecules, and Ions200
- Ch.3 - Chemical Reactions and Reaction Stoichiometry176
- Ch.4 - Reactions in Aqueous Solution155
- Ch.5 - Thermochemistry126
- Ch.6 - Electronic Structure of Atoms131
- Ch.7 - Periodic Properties of the Elements126
- Ch.8 - Basic Concepts of Chemical Bonding123
- Ch.9 - Molecular Geometry and Bonding Theories143
- Ch.10 - Gases147
- Ch.11 - Liquids and Intermolecular Forces91
- Ch.12 - Solids and Modern Materials122
- Ch.13 - Properties of Solutions126
- Ch.14 - Chemical Kinetics174
- Ch.15 - Chemical Equilibrium101
- Ch.16 - Acid-Base Equilibria139
- Ch.17 - Additional Aspects of Aqueous Equilibria146
- Ch.18 - Chemistry of the Environment72
- Ch.19 - Chemical Thermodynamics129
- Ch.20 - Electrochemistry142
- Ch.21 - Nuclear Chemistry101
- Ch.22 - Chemistry of the Nonmetals68
- Ch.23 - Transition Metals and Coordination Chemistry66
- Ch.24 - The Chemistry of Life: Organic and Biological Chemistry10
Brown15th EditionChemistry: The Central ScienceISBN: 9780137542970Non è quello che usi tu?Cambia libro di testo
Capitolo 14, Problema 57c
Indicate whether each statement is true or false. (c) Increasing the reaction temperature increases the fraction of successful collisions between reactants.
Guida verificata passo dopo passo1
Understand the concept of activation energy, which is the minimum energy that reactant molecules must possess in order to undergo a successful chemical reaction.
Recognize that at higher temperatures, the kinetic energy of the molecules increases. This means that more molecules will have energies equal to or greater than the activation energy.
Consider the Maxwell-Boltzmann distribution which shows that as temperature increases, the curve flattens and broadens, indicating that a larger fraction of molecules have higher energies.
Relate the increase in the number of molecules with sufficient energy (above the activation energy) to the likelihood of successful collisions. Successful collisions are those that result in a chemical reaction.
Conclude that increasing the reaction temperature does indeed increase the fraction of successful collisions between reactants, as more reactant molecules have the necessary energy to overcome the activation energy barrier.
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Collision Theory
Collision theory states that for a reaction to occur, reactant particles must collide with sufficient energy and proper orientation. The frequency and energy of these collisions are influenced by factors such as temperature, which affects the kinetic energy of the particles.
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Percorso guidato
02:08
Collision Theory
Effect of Temperature on Reaction Rate
Increasing the temperature generally increases the kinetic energy of molecules, leading to more frequent and more energetic collisions. This results in a higher fraction of collisions that have enough energy to overcome the activation energy barrier, thus increasing the reaction rate.
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Percorso guidato
02:03Average Rate of Reaction
Activation Energy
Activation energy is the minimum energy required for a chemical reaction to occur. When temperature rises, more molecules possess energy equal to or greater than this threshold, which increases the likelihood of successful collisions and, consequently, the rate of reaction.
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Percorso guidato
02:02Activity Series Chart
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The gas-phase reaction Cl(g) + HBr(g) → HCl(g) + Br(g) has an overall energy change of -66 kJ. The activation energy for the reaction is 7 kJ. (a) Sketch the energy profile for the reaction, and label Ea and ΔE.
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Indicate whether each statement is true or false. (c) If you double the temperature for a reaction, you cut the activation energy in half.
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