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Get Full Access to Chemistry: The Central Science - 14 Edition - Chapter 12 - Problem 12.21
Get Full Access to Chemistry: The Central Science - 14 Edition - Chapter 12 - Problem 12.21

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# ?Two patterns of packing for two different circles of the same size are shown here. For each structure (a) draw the two dimensional unit cell

ISBN: 9780134414232 1274

## Solution for problem 12.21 Chapter 12

Chemistry: The Central Science | 14th Edition

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Problem 12.21

Two patterns of packing for two different circles of the same size are shown here. For each structure

(a) draw the two dimensional unit cell;

(b) determine the angle between the lattice vectors, $$\gamma$$, and determine whether the lattice vectors are of the same length or of different lengths; and

(c) determine the type of two-dimensional lattice (from Figure 12.4).

Text Transcription:

\gamma

Step-by-Step Solution:

Step 1 of 5) Acids and bases are among the most important substances in chemistry, and they affect our daily lives in innumerable ways. Not only are they present in our foods, but acids and bases are also crucial components of living systems, such as the amino acids that are used to synthesize proteins and the nucleic acids that code genetic information. Both citric and malic acids are among several acids involved in the Krebs cycle (also called the citric acid cycle) that is used to generate energy in aerobic organisms. The application of acid–base chemistry has also had critical roles in shaping modern society, including such human-driven activities as industrial manufacturing, the creation of advanced pharmaceuticals, and many aspects of the environment. The impact of acids and bases depends not only on the type of acid or base, but also on how much is present. The time required for a metal object immersed in water to corrode, the ability of an aquatic environment to support fish and plant life, the fate of pollutants washed out of the air by rain, and even the rates of reactions that maintain our lives all critically depend on the acidity or basicity of solutions. We will thus explore in this chapter how we measure acidity and how the chemical reactions of acids and bases depend on their concentrations.

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