Lab: shapes of covalent molecules & polarity



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Shapes of Covalent Molecules and Polarity LAB1
Chemical Bonding-answers
Formula



Lewis
Structure



Shared
e-Pairs



Unshared
e- Pairs



Total
e-Pairs



Molecular Shape



Structural Formula



Polarity



HCl



H – Cl :



1



0



1



Linear



H – Cl



Polar



Further Investigations:

1. On the basis of this experiment and your classwork, predict the


a. type of bonding b. molecular shape c. molecular polarity
for each of the following compounds (construct a table):
(1) HBr (3) BaCl2 (5) CI4
(2) SCl2 (4) NH3 (6) AlH3

2. Calculate the electronegativity difference and indicate the type of bond for


the following attractions:
(a) Na - Br (c) Se – O (e) Mg – Cl
(b) C - H (d) Br – Br (f) Al - I

3. What does the term isomer mean?


Key




Formula



Lewis
Structure



Shared
e-Pairs



Unshared
e- Pairs



Total
e-Pairs



Molecular Shape



Structural Formula



Polarity



HCl







1



0 or 3



1 or 4



Linear



H – Cl



Polar

HBr



1

0 or 3

1 or 4

Linear

H – Br

Polar

H2O



2

2

4

Bent



Polar

NH3



3

1

4

Trigonal Pyramidal



Polar

SO3



3

0

3

Trigonal Planar



Non
Polar

CO2



2

2

4

Linear



Polar

H2CO



3

0

3

Trigonal Planar



Polar

C2H2



2

0

2

Linear



Non
Polar

CH4



4

0

4

Tetra
hedral



Non
Polar

HClO



2

2

4

Bent



Polar

O2



2

2

4

Linear

O – O

Non
Polar

AlH3
Ionic



Ionic

Ionic

Ionic

Crystal
Lattice



Ionic

CH3Cl



4

0

4

Tetra
hedral



Polar

HCOOH
Omit



3

0

3

Trigonal Planar



Polar

CO32-



3

0

3

Trigonal Planar



Non
Polar

NH4+



4

0

4

Tetra
hedral



Non
Polar



Further Investigation
1. On the basis of this experiment and your classwork, predict the
a. type of bonding b. molecular shape c. molecular polarity
for each of the following compounds (construct a table):
(1) HBr (3) BaCl2 (5) CI4
(2) SCl2 (4) NH3 (6) AlH3

Compound

Bond
Type

Molecular
Shape

Polarity

HBr

Covalent

Linear

Polar

SCl2

Covalent

Bent

Polar

BaCl2

Ionic

Crystal Lattice

Ionic

NH3

Covalent

Trigonal Pyramidal

Polar

CI4

Covalent

Tetrahedral

Non-Polar

AlH3

Ionic

Crystal Lattice

Ionic

2. Calculate the electronegativity difference and indicate the type of bond for


the following attractions:
(a) Na - Br (c) Se – O (e) Mg – Cl
(b) C - H (d) Br – Br (f) Al - I

Elements

Electronegativity
Difference

Bond Type

Na - Br




Ionic

C - H




Covalent (Non-Polar)

Se – O




Covalent (Polar)

Br – Br




Covalent (Non-Polar)

Mg – Cl




Ionic

Al - I




Ionic

3. What does the term isomer mean?


Any of two or more compounds, radicals, or ions that contain the same number of atoms of the same elements but differ in structural arrangement and properties.


Example

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