Homework 4.docx

# Homework 4.docx - Homework 4 EMAC 270 Name 1 Describe the...

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Homework 4 EMAC 270 Name: _______________________________ 1. Describe the three advantages of FT-IR and the other name they are known by. (6 points) a. Jacquinot’s advantage b. Conne’s advantage c. Fellgett’s advantage 2. A DSC thermogram was taken of a polymer sample. If the Tc peak is 25 J, the integral of the Tm peak is 30 J, the latent heat of fusion is 1.74 J/mg, and the total mass of the sample is 5 mg, what percent of the sample was crystalline? (4 points) 3. True or False. If false, correct the statement. (2 points) A. Differential scanning calorimetry (DSC) Differential scanning calorimetry detects heat flux differences between an empty sample pan and the pan with a sample. This is therefore a thermochemical technique. _________ B. Fourier transform infrared spectroscopy (FTIR) Infrared radiation is heat. Thus, using infrared spectroscopy the heat molecules accelerate their chemical reaction rate. Fourier transformation is a mathematical method of calculating this reaction rate and is a convenient way to obtain the rate of polymerization. _________

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4. Determine which statement is not true. (3 points)
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• Fall '08
• Ishida,H

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