Unit 7 Quiz

1.(20) a) In drawing Lewis structures for the following componds whichone would have oxygen as the central atom?

a) NO2

b) N2O

c) OF2

d) SOCl

b) Which one of the following groups of elements is arranged in orderof increasing electronegativity ?

a) K< Rb< Cs< F

b) Cl < S < Si < Al

c) C < N < O < F

d) F< Cl < Br < I

c) Based on VSEPR Theory, what is the predicted molecular shape of SCl2?

a) triangular planar

b) T-shaped

c) linear

d) tetrahedral

e) angular (bent)

d) Based on VSEPR Theory, what is the predicted molecular shape of CCl4?

a) triangular planar

b) T-shaped

c) linear

d) tetrahedral

e) angular (bent)

e) Based on VSEPR Theory, what is the predicted molecular shape of ICl4(-) ion ?

a) triangular planar

b) angular (bent)

c) octahedral

d) tetrahedral

e) square planar

2. (6)What are the estimated bond anbles of sites 1, 2 and 3 in the structuregiven below

Angle # 1 = _____

Angle # 2 = _____

Angle # 3 = _____

3.(20) Draw appropriate Lewis strucutres for:

a) Methanol , CH3OH

b) Formic acid, HCOOH

c) H2CS

d) ClO3 (-) ion Hint " Cl" is the central atom inthis structure.

e) Three possible resonance structures for PO3 (-) ion.

4. (4) Why is this "picture" of a methane molecule, CH4depicted like this and the ones surrounding Joe Chemist ?