CAP 2 PREP

Question 1

explain what are the two methods used to calculate the strength of an ionic bond

Answer 1

theoretical method -perfect ionic model: the idea that each ion is a perfect sphere /point charges. and is purely ionic so has no covalent character

experimental method -Born Haber cycle:
in this model ions are considered as polarisable. and bonding is ionic and some covalent character.

Question 2

describe how you would distinguish between seperate samples of the two stereoisomers

Answer 2

shine plane polarised light. enantomers will rotate in oppsoite directions.

Question 3

explain how a racemic mixture forms

Answer 3

it has a planar shape so nucleophile has equal chance of attacking from either side.so equal proportions of each enantiomer forming a racemic mixture.

Question 4

explain why there is an attraction between a C=C double bond and Br2

Answer 4

the covalent bond in C=C means it has high electron density. so the Br-Br becomes polarised and delta + Br is attracted to C=C.