Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
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.
consider a 0.0500m HClO2 is a moderately weak electrolyte acid such that 36% of the molecules dissociate when dissolved in water. calculate the van't hoff factor
Ethane is burned with 20% excess air in a furnace operating at a pressure of 100 kPa. Assume complete combustion occurs. Determine the dew point temperature of the flue gas.
Consider an electron in a one-dimensional box the size of a nucleus with one proton Hydrogen, 10-14m. a) Approximate its ground state energy b) Approximate the coulombic energy V between the proton and electron from V = -e2/4pir
Reaction of AsCl3 with Cl2 at low temperature yields a product, believed to be AsCl5, which shows Raman bands at 437,369, 295, 220,213, and 3cm-1. Detailed analysis of the 369 and 295 cm-1 bands show them to arise from totally symmetric modes.
What is the wavelength of a light ray if its frequency is 4.64 x 1014 s-1? answer in units of nanometers (nm).
Grignard reagent made from magnesium and 1-chloro-2-methylpropane with lables charges on the C-Mg bond
Write the overall equation for the reaction. B) Do you expect this reaction to go by an E1 or an E2 mechanism?
When 37.0 mL of 0.640 M H2SO4 is added to 37.0 mL of 1.28 M KOH in a coffee-cup calorimeter at 23.50°C, the temperature rises to 30.17°C. Calculate H of this reaction per mole of H2SO4 and KOH reacted.
NH3 is a weak base Kb = 1.8 x10-5 as well as so the salt NH4Cl acts as a weak acid. Explain what is the ph of a solution that is 0.033 M in NH4Cl
At body temperature 37 C, Ka for aspirin equals 3 x10^ - 5.If two aspirin tablets, each having a mass of 325 mg, are dissolved in a full stomach whose volume is 1 L and whose pH is 2, what percent of the aspirin is in the form of neutral molecules
If a triacylglycerol in peanut oil that contains one palmitic acid, one oleic acid, and one linoleic acid is completely hydrogenated, what is the product
what is the role of lithium hydroxide in the removal of the carbon dioxide exhaled by astronauts?
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd