Organic Chemistry Answers

Draw the expanded structure and skeletal structure for the following compound:  

CH3CH2CH(CH3)(CH2)3CH3 

what is valance bond theory

What is the combustion of butene

1. propyl ethanoate
2. pentyl ethanoate
3. ethyl butanoate
4. ethyl methanoate

If 50 g of sodium acetate can be dissolved into 10 g of water to produce a supersaturated solution, what is the % by mass concentration of the solution?

Draw product reactions for botanic acid + ethanol H+,heat

• Analyse the therapeutic or chemical effects of isomerism. 

• Research the drugs thalidomide and ibuprofen, and their therapeutic effects. Both drugs have optical isomers: compare the structures and properties of the optical isomers in each case study. 

• Explain why one of these drugs is only available as a single optical isomer whilst the other is sold as a racemic mixture (a 50:50 mixture of both optical isomers). 

• Discuss the implications of having to separate a racemic mixture into its stereoisomers and the implications if the two stereoisomers are not separated, with reference to the two drugs.

Examine the importance and impact of isomerism in industry – research case studies in order to consider the formation of different isomers during manufacture,

• Thalidomide babies

• One of the isomers is a treatment for Parkinson’s disease

• Spearmint

• how their presence may influence the industrial process, the differences in properties that they might have, and the possible consequences of ignoring the presence of isomerism.

• Yield/cost/ health & safety

• 50:50 ratio (racemic mixture )- 

• D-isomer:L-isomer 

• Stereoisomers ( +/- = rotate the polarised light to the right +) or to the left (-)

• Stereospecificity 

• D (+) – dextrorotatory isomer

• L (-) – Laevorotatory isomer

If the hydrolysis of a lipid yields alcohol, fatty acid and sugar, it is

a- compound lipid

b-simple lipid

c-steroid

d-terpenene

PET has a Young's, Modulus of 3.5 GPa and PLGA 1.2 GPa. A polymer blend is prepared with 40:60 mixture (PET:PlGA) . What is the Young's, Modulus of this blend (use mixture rule). Calculate the percent load borne by PET when the blend is subjected to a load. If after 10 days, half of PET and one third of PLGA had degraded, what is the Young's Modulus of this blend.