Organic Chemistry Answers

A researcher used a combustion method to analyze a compound use as a anti-knock additive in gasoline a 9.394mg sample of the yielded 31.154 of CO2 and 7.977mg of water in the combustion. calculate the percentage composition of the compound and determine it empirical formula

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 & displayed formulae and 

• photographs of 3D models of stereoisomers (draw the optical isomers in 3D). 

• 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) – draw the linear structures for the monosaccharides

• and starch with cellulose. Compare different stereoisomers of the same molecular formula, considering any difference in physical or chemical properties that exist.

Define a potentiometric titration and draw a schematic graph of a redox potentiometric titration.

Calculate the amount of chlorine gas evolved during the electrolysis of molten potassium 

chloride on passing a current of 0.5 A for two hours through it.

The cell reaction for a galvanic cell is given below: 

 Zn(s) + 2Ag+

 (aq) →Zn2+ (aq) + 2Ag(s) 

i) Write the half-cell reactions at the anode and the cathode. 

ii) Calculate the value of cell emf under standard conditions; use data from Table 7.1. 

 iii) Will the reaction be spontaneous as written?

Differentiate between voltaic and electrolytic cells.

What are transference numbers and how are they related to ionic mobilities?

Use projection lines to indicate stereochemistry of 1-methylcyclohexene + HBr + H2O2

structure of the major product of 1-methylcyclohexene + HBr + H2O2  with proper conformation or configuration