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Ethylene glycol (C2H6O2) is a non-volatile and non-electrolyte compound with a density of 1.11 g.cm–3 at 25.0°C. Calculate the volume ethylene glycol that must be added to 675 cm3 of water to reduce the vapor pressure by 3.82% at 25.0°C. The density and vapor pressure of pure water at 25.0°C are 1.02 g.cm–3 and 23.8 torr respectively
• 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, 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
• Examine the importance and impact of isomerism in industry – research case studies in order to consider the formation of different isomers during manufacture, 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
Explain stereoisomerism and the different types that exist (i.e. geometric and optical). Give simple and naturally occurring examples of each type to illustrate your explanations, including structural formulae and photographs of 3D models of stereoisomers. For geometric stereoisomerism, include cis and trans (Z and E) stereoisomers of unsaturated fatty acids (e.g. oleic acid and elaidic acid). For optical isomerism, include amino acids (e.g. L-alanine and D-alanine), sugars (e.g. glucose and galactose) and starch with cellulose. Compare different stereoisomers of the same molecular formula, considering any difference in physical or chemical properties that exist.
which is better base and why? -C(trible bond)-N or CH3O- ?
which is the name of CH3CH2CH(CH2Br)CH2CH2CH3?Which is the main chain?
How much heat is needed to completely vapourize 3.6 g of propane (C3H8) at its boiling point?
Given: ΔHvap = 15.7 kJ/mol
Synthesis of 2 methylpentanoic acid from malonic ester
I need 2 adhesive joints and for each one make the list of the proposed parameters for quality control. Specify the type of stress applied to the joint and the adhesive stress. For each test describe the test method (in short - the principle, the device, the specimens used, what is measured).
for example for the adhesive with which a magnet is glued to a figurine. I do the shock test for the adhesive.
