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1.) How would you distinguish experimentally between an amphourous, a crystalline and a crosslinked polymer?
2.) Consider 3 samples of polyisobutylene. All molecules in sample A have a molecular weight 30,000g/mol; all those in B have a molecular weight of 70,000 g/mol; and those in C have a molecular weight of 100,000 g/mol. If 10g of A are mixed with 5g of B and 1g of C, Calculate average Mn and average Mw.
The vapor pressure of water is 0.196 atm at 60 C. What is the equilibrium constant for the transformation H2O (l)--><--H2O (g)
If 60.0g of Cu metal at 85C were added to 60.0g ethanol at 10C in a calorimeter of heat capacity 30.0 J/K what would the final temperature be assuming no heat losses? cp for Cu= 0.380 J/K/g and Cp for ethanol = 60.0 J/K/mol
Explain why the element bromine prefers to have its two atoms form covalent bonds rather than ionic bonds
A mixture of gases contains 2.42 g of Kr, 4.58 g of Ar, and 5.74 g of NO2. What is the partial pressure in atm of each component of this mixture if it is held in a 11.5-L vessel at 31.3 oC? Use R = 0.0821 L-atm/mol-K as the value of the gas consta..
The value of Kf for cyclohexane is 20.0°C/m, and its normal freezing point is 6.6°C. A mass of 1.604 g of a waxy solid dissolved in 10.000 g of cyclohexane results in a freezing point of 4.4°C. Calculate the molar mass of the solid.
Assuming electrons with quantum numbers (n,l,mt,ms), how does an electron with the quantum numbers (2,1,1+1/2) differ from an electron with quantum numbers (2,1,-1,+1/2)?
What volumes of sulfur dioxide and dihydrogen sulfide gases are necessary to produce 11.4 L of water vapor? The balanced equation is SO2 + 2 H2S à 3 S + 2 H2O.
Draw a structural formula of an alkene or alkenes (if more than one) that undergo acid-catalyzed hydration and without rearrangement give 2-methyl-2-butanol as the MAJOR product
Gas A has a density of 0.20 gL-1, and gas B has a density of 0.80 gL-1, both at the same specific temperature and pressure. Which gas will diffuse faster. Briefly explain.
In trans-1,2-dibenzoylethylene, even though the conjugated C=O group frequency coincides directly with the expected C=C stretching frequency, we would not have expected to observe the latter stretching mode in the infrared spectrum. Why
Fermentation of glucose produces ethyl alcohol and carbon dioxide; C6H12O6(l) ? 2 C2H5OH(l) + 2 CO2(g) What is ?H°rxn (in kilojoules) if 385.3 mL of CO2 was collected over water at 20.00°C and 761.2 mm Hg
Calculate the standard reaction enthalpy for the following reaction. N2H4(l) + H2(g) -----> 2NH3(g) Given: N2H4(l) + O2(g) -------> N2 (g) + 2H2O(g)
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