Principles of Instrumental Analysis
7th Edition
ISBN: 9781305577213
Author: Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher: Cengage Learning
expand_more
expand_more
format_list_bulleted
Question
Chapter 31, Problem 31.10QAP
Interpretation Introduction
Interpretation:
The cause of glass transition for
Concept introduction:
The glass transition is also known as glass−liquid transition an associated with the process in which glass is converted into a liquid state. Vitrification is a reverse process to glass−liquid transition.
Expert Solution & Answer
Trending nowThis is a popular solution!
Students have asked these similar questions
Why does fluorescence tend to be the mirror image of absorption?
QUESTION 4
Answer the following questions based on the given table.
Compound
Chromophores
Wavelength (Ama)
Acetone
C=0
186 nm and 280 nm
190 nm
Butene
C=C
Fe(SCN)
aqueous solution of Ni²*
475 nm
400 nm
a) Based on the given chromophores, determine the types of electronic transitions which
occur for each of acetone and butene.
b) Provide the type of electronic transition which occur for the aqueous solution of Ni".
c) Iron(III) thiocyanate, Fe(SCN)* is an example of a charge-transfer complex. Outline the
steps of the electron transfer process in this complex.
What is the difference between an absorption spectrum and a standard curve?
Chapter 31 Solutions
Principles of Instrumental Analysis
Knowledge Booster
Similar questions
- What is scattering coefficient?arrow_forwardBriefly describe how a phase-contrast microscope work and the kind of image that itproduces. Give a specific use for this type of microscope.arrow_forwardWhy do we need to prepare a standard curve before we can use Beer's Law to determine the concentration of a solution? O We don't have to create a standard curve so long as we choose the appropriate wavelength. Because the standard curve tells us the absorbance of our sample Because the standard curve is used to determine the extinction coefficient Because the standard curve indicates what wavelength to set the spectrophotometer toarrow_forward
- How can we use the observed colors to determine quantities and identities of materials? I am highly confused by spectrometry.arrow_forwardMultiple peaks can be observed in the UV/Vis spectrum. Possible Falsearrow_forwardwhy is a calibration curve likely to be linear over a wider range of concentrations at the wavelength of maximum absorption compared to a wavelength on a shoulder of the absorption curve?arrow_forward
- 7. Suppose you are an employee of a plastics firm and you are assigned the task of identifying a polymer used by a competitor to make certain automotive parts. You prepare a film of the polymer and determine its IR spectrum, as shown below. What information can you deduce from the spectrum? Spectrum below plots transmittance (y-axis) vs. frequency in wavenumber (cm³¹) T прити JU 0 0 0 0 0 1000 3000 2000 1500 1000 500arrow_forwardIdentify and provide either an concise explanation of the concept signal-to-noise ratio (SNR), in the context of chemical analysis.arrow_forwardAn absorption measurement with a 1 cm path length yields a reading of 0.004 absorbance units with a noise of 0.001 absorbance units and a mean noise reading of 0 for 10 scans averaged together. Assuming the noise for a single scan does not change if the path length is increased to 6 cm and the number of scans is increase to 100, what is the signal to noise of the new measurement.arrow_forward
- True or False?arrow_forwardCite one research article that used an IR spectrophotometer in their study and discuss how they used the instrument to generate their data and how they used the data of IR in answering their hypothesis.arrow_forwardZinc (Zn) Calibration Curve 0.070 0.060 0.050 0.040 0.030 0.020 0.010 0.000 0.0000 0.0010 0.0020 0.0030 0.0040 0.0050 0.0060 0.0070 [Zn] (M) Estimate the concentration (in M) of an unknown Zn sample that has an absorption of 0.025. 0.0050 Absorbancearrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- Principles of Instrumental AnalysisChemistryISBN:9781305577213Author:Douglas A. Skoog, F. James Holler, Stanley R. CrouchPublisher:Cengage LearningPhysical ChemistryChemistryISBN:9781133958437Author:Ball, David W. (david Warren), BAER, TomasPublisher:Wadsworth Cengage Learning,
- Chemistry for Engineering StudentsChemistryISBN:9781285199023Author:Lawrence S. Brown, Tom HolmePublisher:Cengage Learning
Principles of Instrumental Analysis
Chemistry
ISBN:9781305577213
Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:Cengage Learning
Physical Chemistry
Chemistry
ISBN:9781133958437
Author:Ball, David W. (david Warren), BAER, Tomas
Publisher:Wadsworth Cengage Learning,
Chemistry for Engineering Students
Chemistry
ISBN:9781285199023
Author:Lawrence S. Brown, Tom Holme
Publisher:Cengage Learning