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- 5. Explain the determination of molecular weight of polymer samples usingdilute viscosity measurement.Q. Determination of hardness by Clark's method.4. When performing a melting point on a solid compound using a melting point apparatus, two melting point determinations were made. One sample, which was 1 mm in height in the capillary, possessed a melting point of 200.0-200.5°C. The other sample was 25 mm in height. What would you expect the approximate melting point to be for this sample, assuming identical heating rates of 1°/min? (Hint: heat is applied from the bottom of the sample) (Give an actual numerical approximation!) 5. For the same solid compound as the question above, if the 1 mm sample was heated at 60° per minute on a melting point apparatus, what would you expect for an approximate melting point? (note that at this heating rate, the sample will melt rather quickly, but again give an actual numerical approximation)
- (d) Crystalline polyethylene has a density of 1000 kg m³ and amorphous polyethylene a density of 865 kg m3. Calculate the volume fraction crystallinity of a sample of branched polyethylene which has a density of 900 kg m. Why is the crystallinity of this sample so low?From the practical standpoint, is it better to use a "good" solvent or a "poor" solvent when measuring polymer molecular weight? Explain.What are impurity defects?
- Describe the packaging of body center cubic (BCC) and face center cubic (FCC) and verify your answer.3.Why is slow cooling required to produce pure crystals?Determine phosphate concentration of a water sample using the following information: Standard curve- slope: 1763.2 y-int: 0.011806 R^2: 0.99181 Absorbance of water sample: 0.013