2. Realicen las representaciones de Lewis (más la ecuación de formación en caso de que sea iónica o las fórmulas semidesarrolladas en caso de que sea covalente) de las siguientes

moléculas: a)CO2 b)NH3 c)H2 d)H2S e)NaBr f)MgI2 g)K2Se h)Li2S i)O2 j)N2

k)P2O5 l)SO3 m)HCl n)CuO ñ)Fe2O3 (el hierro con tres electrones en el último nivel)​

a

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.