Ch.14 - Chemical Kinetics

Brown - Chemistry: The Central Science 15th Edition

Brown15th EditionChemistry: The Central ScienceISBN: 9780137542970Not the one you use?Change textbook

Brown 15th Edition

Ch.14 - Chemical Kinetics

Problem 18a

Chapter 14, Problem 18a

(a) What are the units usually used to express the rates of reactions occurring in solution?

Verified step by step guidance

Identify the type of reaction: Since the question specifies reactions occurring in solution, we are dealing with reactions where reactants are dissolved in a solvent.

Understand the concept of reaction rate: Reaction rate refers to the speed at which reactants are converted into products. It is a measure of the change in concentration of reactants or products per unit time.

Recognize common units of concentration: In solutions, concentration is typically expressed in moles per liter (Molarity, M).

Determine the appropriate unit for time: Time is generally measured in seconds (s) in the context of reaction rates.

Combine the units of concentration and time: The rate of a reaction in solution is usually expressed in terms of a change in concentration over a change in time, leading to units of Molarity per second (M/s).

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Reaction Rate

The reaction rate is a measure of how quickly reactants are converted into products in a chemical reaction. It is typically expressed as the change in concentration of a reactant or product per unit time, allowing chemists to quantify the speed of the reaction under specific conditions.

Concentration Units

Concentration is a key factor in determining reaction rates and is commonly expressed in units such as molarity (M), which is moles of solute per liter of solution. Understanding these units is essential for calculating how changes in concentration affect the rate of a reaction.

Time Units

Time is another critical component in expressing reaction rates, typically measured in seconds (s), minutes (min), or hours (h). The choice of time unit can influence the interpretation of the reaction rate, especially in fast or slow reactions, making it important to maintain consistency in units when comparing rates.

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Related Practice

Textbook Question

(b) Name three factors that can affect the rate of a chemical reaction.

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Textbook Question

b. As the temperature increases, does the reaction rate usually increase or decrease?

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Textbook Question

Consider the following hypothetical aqueous reaction: A(aq) → B(aq). A flask is charged with 0.065 mol of A in a total volume of 100.0 mL. The following data are collected: Time (min) 0 10 20 30 40 Moles of A 0.065 0.051 0.042 0.036 0.031 (a) Calculate the number of moles of B at each time in the table, assuming that there are no molecules of B at time zero and that A cleanly converts to B with no intermediates.

Consider the diagram that follows, which represents two steps in an overall reaction. The red spheres are oxygen, the blue ones are nitrogen, and the green ones are fluorine. d. Write the rate law for the overall reaction if the first step is the slow, rate-determining step. [Section 14.5]

Textbook Question

Based on the following reaction profile, how many intermediates are formed in the reaction A⟶C? How many transition states are there? Which step, A⟶B or B⟶C, is the faster? For the reaction A⟶C, is Δ𝐸 positive, negative, or zero? [Section 14.5]