Determine as geometrias usando a teoria vsepr. Indique o (s) ângulo (s) de ligação aproximado (s) em cada molécula e determine se cada molécula é polar ou não polar a) BCl3 b) PCl5 c) NCl3 d) SO3 e) XeF4 f) HBF2?

a) #"BCl"_3#

Deixamos como exercício para o aluno fazer este.

b) #"PCl"_5#

Outro exercício, mas aqui está um link para o estrutura de #"PBr"_5# para ajudá-lo.

c) #"NCl"_3#

(i) Lewis structure

https://cluster13-files.instructure.com/courses/986898/files/31116480/course%20files/003%20Chapter%209%20Chemical%20Bonding%20I%3A%20%20Lewis%20Theory/Electron%20Dot%20Structures/07048%20bbluejpg
(from usflearn.instructure.com)

This is an #"AX"_3"E"# molecule.

(ii) Shape — Trigonal pyramid

http://file2.answcdn.com/answ-cld/image/upload/h_320,c_fill,g_face:center,q_60,f_jpg/v1401098305/ql7oh2p4szvm3yphhcp5png
(from www.answers.com)

(iii) Bond angles — slightly less than 109.5°

(iv) Polarity — polar

(D) #"SO"_3#

(i) Lewis structure

(from gallery4share.com)

This is an #"AX"_3# system.

(ii) Shape — Trigonal planar

http://glencoe.mcgraw-hill.com/sites/dl/free/007874637x/514757/trigonal_planarjpg
(from www.suggestkeyword.com)

(iii) Bond angles — 120°

(iv) Polarity — nonpolar

All bond dipoles cancel, therefore

e) #"XeF"_4#

(i) Lewis structure

http://images.tutorvista.com/cms/images/101/lewis-dot-structure-of-xef4png
(from chemistry.tutorvista.com)

This is an #"AX"_4"E"_2# structure.

(ii) Shape — square planar

(iii) Bond angles — 90°

(iv) Polarity — nonpolar

f) #"HBF"_2#

(i) Lewis structure

(from www.uwplatt.edu)

This is an #"AX"_3# structure.

(ii) Shape — Trigonal planar

(iii) Bond angles — Approximately 120°.

(iv) Polarity — polar