Laboratory Manual Chemistry in Context
Laboratory Manual Chemistry in Context
8th Edition
ISBN: 9780073518121
Author: American Chemical Society
Publisher: McGraw-Hill Education
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Chapter 3.4, Problem 3.10CT

(a)

Interpretation Introduction

Interpretation:

The wavelegths corresponding to the strongest IR absorbance for water vapor has to be estimated from the given spectra.

Concept introduction:

  • Electromagnetic spectrum is a range of all types of electromagnetic radiation.

Laboratory Manual Chemistry in Context, Chapter 3.4, Problem 3.10CT , additional homework tip  1

  • IR Spectroscopy: The bonds between atoms in the molecule stretch and bend, absorbing IR energy and creating the IR spectrum.
  • IR spectroscopy is used to identify the functional groups in a compound. The frequencies in IR spectroscopy are reported using a unit called wavenumber and it is represented by ν¯ and their unit is cm1 . using wavenumber scale, IR absorptions occurs from 4000cm-1-400cm-1

ν¯=1λλ=wavelength

  • Wavenumber increases with increase in frequency.

(b)

Interpretation Introduction

Interpretation:

The wavelengths which represents bending and stretching vibrations has to be determined.

Concept introduction:

  • Electromagnetic spectrum is a range of all types of electromagnetic radiation.

Laboratory Manual Chemistry in Context, Chapter 3.4, Problem 3.10CT , additional homework tip  2

  • IR Spectroscopy: The bonds between atoms in the molecule stretch and bend, absorbing IR energy and creating the IR spectrum
  • Asymmetrical stretching or bending and internal rotations changes the dipole moment of a molecule. Asymmetrical stretching and bending is IR active. Symmetrical stretching and bending does not change the dipole moment of a molecule and so it is not IR active.
  • Vibrations in a Non-linear triatomic (H2O) molecule is shown below,

Laboratory Manual Chemistry in Context, Chapter 3.4, Problem 3.10CT , additional homework tip  3

  • IR spectroscopy is used to identify the functional groups in a compound. The frequencies in IR spectroscopy are reported using a unit called wavenumber and it is represented by ν¯ and their unit is cm1 . using wavenumber scale, IR absorptions occurs from 4000cm-1-400cm-1

ν¯=1λλ=wavelength

  • Wavenumber increases with increase in frequency.
  • C=νλC-speedofthelightν-frequencyλ-wavelength
  • Less amount of energy is needed to bend a molecule than to stretch it.

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Chapter 3 Solutions

Laboratory Manual Chemistry in Context

Ch. 3.8 - Prob. 3.21CTCh. 3.9 - Prob. 3.22CTCh. 3.9 - Prob. 3.23YTCh. 3.9 - Prob. 3.24CTCh. 3.10 - Prob. 3.26CTCh. 3.10 - Prob. 3.27CTCh. 3.11 - Prob. 3.29CTCh. 3.11 - Prob. 3.30YTCh. 3.11 - Prob. 3.31YTCh. 3.11 - Prob. 3.32CTCh. 3.11 - You Decide Climate Change Insurance? Mitigation of...Ch. 3.11 - Prob. 3.34SCCh. 3.11 - Prob. 3.35CTCh. 3 - Prob. 3.1CTCh. 3 - The chapter concluded with a quote from John...Ch. 3 - Prob. 2QCh. 3 - Prob. 3QCh. 3 - Prob. 5QCh. 3 - a. It is estimated that 29 megajoules per square...Ch. 3 - Consider Figure 4.23. a. How does the present...Ch. 3 - Understanding Earths energy balance is essential...Ch. 3 - Explain each of these observations. a. A car...Ch. 3 - Prob. 10QCh. 3 - Draw the Lewis structure and name the molecular...Ch. 3 - Draw the Lewis structure and name the molecular...Ch. 3 - a. Draw the Lewis structure for methanol (wood...Ch. 3 - a. Draw the Lewis structure for ethene (ethylene),...Ch. 3 - Prob. 15QCh. 3 - Prob. 16QCh. 3 - Prob. 17QCh. 3 - Prob. 18QCh. 3 - Termites possess enzymes that allow them to break...Ch. 3 - Consider Figure 4.4. a. Which sector has the...Ch. 3 - Silver has an atomic number of 47. a. Give the...Ch. 3 - Silver only has two naturally occurring isotopes:...Ch. 3 - a. Calculate the average mass in grams of an...Ch. 3 - Prob. 24QCh. 3 - Prob. 25QCh. 3 - The total mass of carbon in living systems is...Ch. 3 - Prob. 27QCh. 3 - Prob. 28QCh. 3 - Prob. 29QCh. 3 - Prob. 30QCh. 3 - The Arctic has been called our canary in the coal...Ch. 3 - Do you think the comment made in the cartoon is...Ch. 3 - Prob. 33QCh. 3 - Prob. 34QCh. 3 - Over the last 20 years, about 120 billion tons of...Ch. 3 - Prob. 36QCh. 3 - Prob. 37QCh. 3 - Prob. 38QCh. 3 - Ethanol, C2H5OH, can be produced from sugars and...Ch. 3 - Prob. 40QCh. 3 - Prob. 41QCh. 3 - Prob. 42QCh. 3 - Prob. 43QCh. 3 - Prob. 44QCh. 3 - Prob. 45QCh. 3 - Prob. 46QCh. 3 - Prob. 47QCh. 3 - Prob. 48QCh. 3 - Prob. 49QCh. 3 - Prob. 50QCh. 3 - Former vice president Al Gore writes in his 2006...Ch. 3 - Prob. 52QCh. 3 - Prob. 53QCh. 3 - Data taken over time reveal an increase in CO2 in...Ch. 3 - In the energy industry, 1 standard cubic foot...Ch. 3 - Prob. 56QCh. 3 - A solar oven is a low-tech, low-cost device for...Ch. 3 - In 2005, the European Union adopted a...Ch. 3 - The world community responded differently to the...
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