Book cover for Chemistry

Chemistry

Raymond Chang, Jason Overby

ISBN #9781259911156

13th Edition

3,254 Questions

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26,395 Students Helped

Homework Questions

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Summary

Learning Objectives

Key Concepts

Example Problems

Explanations

Common Mistakes

Summary

This section focuses on chemical kinetics, explaining how reaction rates are determined and expressed through changes in concentration over time. It distinguishes between average and instantaneous rates, describes how to derive and apply rate laws, and emphasizes the importance of the rate constant and the activation energy. The Arrhenius equation is highlighted as a key tool for understanding how temperature influences reaction rates, and the discussion extends to reaction mechanisms, including the role of catalysis. Overall, a solid grasp of these kinetic principles is crucial for applications ranging from drug design to radiocarbon dating.

Learning Objectives

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Key Concepts

CONCEPT

DEFINITION

Acids and Bases (Ch 15)

Explains the fundamentals of acid–base chemistry by presenting both the Brønsted and Lewis definitions along with methods to evaluate acid and base strength. •

Example Problems

Example 1

What is meant by the rate of a chemical reaction? What are the units of the rate of a reaction?

Example 2

Distinguish between average rate and instantaneous rate. Which of the two rates gives us an unambiguous measurement of reaction rate? Why?

Example 3

What are the advantages of measuring the initial rate of a reaction?

Example 4

Can you suggest two reactions that are very slow (take days or longer to complete) and two reactions that are very fast (reactions that are over in minutes or seconds)?

Example 5

Write the reaction rate expressions for the following reactions in terms of the disappearance of the reactants and the appearance of products: (a) $\mathrm{H}_{2}(g)+\mathrm{I}_{2}(g) \longrightarrow 2 \mathrm{HI}(g)$ (b) $5 \mathrm{Br}^{-}(a q)+\mathrm{BrO}_{3}^{-}(a q)+6 \mathrm{H}^{+}(a q) \longrightarrow$ $$ 3 \mathrm{Br}_{2}(a q)+3 \mathrm{H}_{2} \mathrm{O}(l) $$

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Step-by-Step Explanations

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Common Mistakes

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