Principles of Instrumental Analysis
7th Edition
ISBN: 9781305577213
Author: Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher: Cengage Learning
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Textbook Question
Chapter 7, Problem 7.11QAP
Why is glass better than fused silica as a prism construction material for a monochromator to be used in the region of 400 to 80 nm?
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Chapter 7 Solutions
Principles of Instrumental Analysis
Ch. 7 - Prob. 7.1QAPCh. 7 - Prob. 7.2QAPCh. 7 - The Wien displacement law states that the...Ch. 7 - Prob. 7.4QAPCh. 7 - Prob. 7.5QAPCh. 7 - Describe the differences and similarities between...Ch. 7 - Prob. 7.7QAPCh. 7 - Prob. 7.8QAPCh. 7 - Prob. 7.9QAPCh. 7 - Prob. 7.10QAP
Ch. 7 - Why is glass better than fused silica as a prism...Ch. 7 - Prob. 7.12QAPCh. 7 - Prob. 7.13QAPCh. 7 - Prob. 7.14QAPCh. 7 - Prob. 7.15QAPCh. 7 - Prob. 7.16QAPCh. 7 - Prob. 7.17QAPCh. 7 - Prob. 7.18QAPCh. 7 - Prob. 7.19QAPCh. 7 - Prob. 7.20QAPCh. 7 - Prob. 7.21QAPCh. 7 - Prob. 7.22QAPCh. 7 - Prob. 7.23QAPCh. 7 - Prob. 7.24QAP
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- More polar molecules move more slowly through silica than less polar molecules. Why is silica gel chromatography a good method of separating methyl orange from biphenyl?arrow_forwardYou have ZrO2-Nb2O5 composite and HfO2-Ta2O5 composite. Can you distinguish the oxide phases in the composites using SEM imaging? How do you identify different oxide phases?arrow_forwardThe result of a TLC experiment showed that Compound X has an Rf values of 0.25 on a silica plate using 10% ethyl acetate in hexane as the mobile phase. Indicate if the Rf values of Compound X would be higher or lower in the following solvents: TOLUENEarrow_forward
- What complications would a dried-out column (solvent level is below the top of the silica) introduce to the elution and isolation of pigments?arrow_forwardIn color chromatography of plant pigments, what complications would a dried-out column (solvent level is below the top of the silica) introduce to the elution and isolation of pigments?arrow_forwardThe result of a TLC experiment showed that Compound X has an Rf values of 0.25 on a silica plate using 10% ethyl acetate in hexane as the mobile phase. Indicate if the Rf values of Compound X would be higher or lower in the following solvents: HEXANEarrow_forward
- In general, we want to have absorptions less than or equal to 1. Given that an ethanol solution of compound Y (150.0 g/mol) in a 1.00 cm quartz cell has an extinction coefficient (ε) of 23,150 at λmax=235 nm, what is the top concentration, in μM, we should consider for compound Y? Report your answer to the correct number of significant figures. Do not report the units in your answer.arrow_forwardWhich of the following cannot be used as adsorbent in column chromatography? a. Silica gel b. Magnesium oxide c. Alumina d. Potassium permanganatearrow_forwardWe collected a clastic muscovite grain from the shale at sample K. The 40Ar/40K ratio is 0.65. What is the age of the grain?arrow_forward
- It is usually recommended to clean the glass surfaces of a refractometer with ethanol or isopropyl alcohol rather than acetone or water. Why?arrow_forwardIs thin-layer chromatography a type of normal-phase chromatography or a type of reverse-phase chromatography? Define these two classifications.arrow_forwardDo not give handwriting solution Using 0.901 g/cm3 for density of tri - isopropylsilanol (i-C3H7)3SiOH and assuming spherical shape of the molecule, determine its molecular cross section and the maximal grafting density for these molecules supported on a flat silica surface.arrow_forward
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