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Although polyethylene can twist and turn in random ways, the most stable form is a linear one with the carbon backbone oriented as shown in the following figure:
The solid wedges in the figure indicate bonds from carbon that come out of the plane of the page; the dashed wedges indicate bonds that lie behind the plane of the page.
(a) What is the hybridization of orbitals at each carbon atom? What angles do you expect between the bonds?
(b) Now imagine that the polymer is polypropylene rather than polyethylene. Draw structures for polypropylene in which (i) the CH3 groups all lie on the same side of the plane of the paper (this form is called isotactic polypropylene); (ii) the CH3 groups lie on alternating sides of the plane (syndiotactis polypropylene); or (iii) the CH3 groups are randomly distributed on either side (atactic polypropylene).Which of these forms would you expect to have the highest crystallinity and melting point, and which the lowest? Explain in terms of intermolecular interactions and molecular shapes.
(c) Polypropylene fibers have been employed in athletic wear. The product is said to be superior to cotton or polyester clothing in wicking moisture away from the body through the fabric to the outside. Explain the difference between polypropylene and polyester or cotton (which has many -OH groups along the molecular chain) in terms of intermolecular interactions with water.
an automobile gasoline tank holds 49 of gasoline. when the gasoline burns 172 of oxygen are consumed and carbon dioxide
Compute the theoretical yield of cyclohexanone in mmol. 0.156 ml of cyclohexanol used followed by 80 mg of acetic acid as well as 2.3 ml of a 5.25 % solution of sodium hypochlorite.
A 75mL sample of NaOH was triated with >45 M HCL. 36 mL of HCL were necessary to reach the equivalent point. Compute the molarity of the NaOH.
In acid solution, ethanol forms diethyl ether (C4H10O): 2 C2H6O --> C4H10O + H2O If 50.0 g of ethanol yields 33.9 g of diethyl ether, what is the percent yield for the reaction
Calculate the mass of ice at -15°C that must be added to cool the water to 10°C after thermal equilibrium is achieved. To find the mass of water use the density of water = 1.0 g/mL.
Lactic acid, C3H6O3, is a monoprotic acid that is available in solid form. Determine the concentration of an unknown solution of sodium hydroxide
Calculate the molarity of a sodium hydroxide solution if a 0.7216 g sample of KHP was dissolved in 50 mL of water and titrated with 24.71 mL of sodium hydroxide to a phenolphthalein end point.
cobalt-60 undergoes beta decay has a half life of 5.26 years.a how many beta particles are emitted in 180 s by a
Question- 18.7 L N2 at 25 °C and 125 kPa and 31.1 L O2 at 25 °C and 125 kPa were transferred to a tank with a volume of 4.00 L. What is the total pressure at 37 °C
consider a single d-electron in a homogeneous magnetic field.calculate the angles which the respective angular momentum
Carvone is the major constituent of spearment oil. What products would you expect from reaction of carvone with the following reagents?
Sulfuric acid (H2SO4) is a very strong diprotic acid. If 0.022 moles of sulfuric acid is mixed with water to make 607 mililiter of solution, what is the molarity of H+.
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