Domanda del libro di testo
A reaction A + B → C obeys the following rate law: Rate = k[B]2. (a) If [A] is doubled, how will the rate change? Will the rate constant change?
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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 27c
A reaction A + B → C obeys the following rate law: Rate = k[B]2. (c) What are the units of the rate constant?
Guida verificata passo dopo passo1
Identify the rate law given in the problem: Rate = k[B]^2. This indicates that the rate of the reaction depends on the concentration of B squared.
Recall that the rate of a reaction is typically expressed in units of concentration per unit time, such as mol/L/s.
The concentration of B is expressed in mol/L. Since the rate law is Rate = k[B]^2, the concentration term [B]^2 will have units of (mol/L)^2 or mol^2/L^2.
To find the units of the rate constant k, rearrange the rate law to solve for k: k = Rate / [B]^2.
Substitute the units into the rearranged equation: k = (mol/L/s) / (mol^2/L^2). Simplify this expression to determine the units of k.
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Rate of Reaction
The rate of a chemical reaction quantifies how quickly reactants are converted into products. It is typically expressed in terms of concentration change over time, such as moles per liter per second (mol/L/s). Understanding the rate is crucial for determining how the concentration of reactants affects the speed of the reaction.
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Percorso guidato
02:03
Average Rate of Reaction
Rate Law
A rate law is an equation that relates the rate of a reaction to the concentration of its reactants, each raised to a power corresponding to their reaction order. In the given rate law, Rate = k[B]<sup>2</sup>, the reaction is second-order with respect to B, indicating that the rate is proportional to the square of the concentration of B. This relationship is essential for calculating the units of the rate constant.
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01:52Rate Law Fundamentals
Units of the Rate Constant (k)
The units of the rate constant (k) depend on the overall order of the reaction. For a second-order reaction, like the one described, the units of k are derived from the rate equation. Since the rate has units of mol/L/s and the concentration of B is in mol/L, the units of k must be L/(mol·s) to ensure that the equation is dimensionally consistent.
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01:14Equilibrium Constant K
Pratica correlata
Domanda del libro di testo
Consider a hypothetical reaction between A, B, and C that is first order in A, zero order in B, and second order in C. (b) How does the rate change when [A] is doubled and the other reactant concentrations are held constant? (c) How does the rate change when [B] is tripled and the other reactant concentrations are held constant? (d) How does the rate change when [C] is tripled and the other reactant concentrations are held constant? (f) By what factor does the rate change when the concentrations of all three reactants are cut in half?
Domanda del libro di testo
Consider a hypothetical reaction between A, B, and C that is first order in A, zero order in B, and second order in C. (a) Write the rate law for the reaction.
1557
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Domanda del libro di testo
A reaction A + B → C obeys the following rate law: Rate = k[B]2. (b) What are the reaction orders for A and B? What is the overall reaction order?
522
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Domanda del libro di testo
Consider a hypothetical reaction between A, B, and C that is first order in A, zero order in B, and second order in C. (e) By what factor does the rate change when the concentrations of all three reactants are tripled?
1050
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