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Solutions for Chemistry: The Central Science | 12th Edition | ISBN: 9780321696724 | Authors: Theodore E. Brown; H. Eugene LeMay; Bruce E. Bursten; Catherine Murphy; Patrick Woodward 9780321696724

Solution for problem 105AE Chapter 9

Azo dyes are organic dyes that are used for many

Chemistry: The Central Science | 12th Edition


Problem 105AE

Azo dyes are organic dyes that are used for many applications, such as the coloring of fabrics. Many azo dyes are derivatives of the organic substance azobenzene, C12H10N2. A closely related substance is hydrazobenzene, C12H12N2. The Lewis structures of these two substances are

(Recall the shorthand notation used for benzene.) (a)What is the hybridization at the N atom in each of the substances? (b) How many unhybridized atomic orbitals are there on the N and the C atoms in each of the substances? (c) Predict the N -- N -- C angles in each of the substances. (d) Azobenzene is said to have greater delocalization of its 𝜋 electrons than hydrazobenzene. Discuss this statement in light of your answers to (a) and (b). (e) All the atoms of azobenzene lie in one plane, whereas those of hydrazobenzene do not. Is this observation consistent with the statement in part (d)? (f) Azobenzene is an intense red-orange color, whereas hydrazobenzene is nearly colorless. Which molecule would be a better one to use in a solar energy conversion device? (See the “Chemistry Put to Work” box for more information about solar cells.)

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General Chemistry 1305 Week 1 Notes Basics of Chemistry The word chemistry comes from the greek word “chemei” which means cast together. The applications of chemistry cover a wide set of disciplines such as biology, physics, engineering, biotechnology, medicine, environmental…etc. Specifically, chemistry is the study of matter and the changes matter goes through. Matter, substances and mixtures Since chemistry studies matter it’s important to know exactly what matter is; matter is anything with mass that occupies space. Matter can be found in three states, each with different properties. Gaseous Matter is characterized by the absence of shape or volume, the atoms which make up gases are far away from each other and have a fair amount of energy which makes them travel in random direction

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Azo dyes are organic dyes that are used for many