Assignment DK014 Session 2021/2022

ASSIGNMENT DK014
INDIVIDUAL TASK

TITLE: MOLECULAR GEOMETRY POSTER

Introduction:
There are 5 basic shapes in molecular geometry. BeH2 and BeHCl are compounds having 2
electron groups and linear structure with 180˚ angle. Even though both molecules can have
same electron groups and molecular shape, they can be differing in polarity. BeH2 is non-polar
molecule while BeHCl are polar molecule.

TASK:

Compound A and Compound B have same molecular shape and has no lone pair at the central
atom. A is a polar compound and B is a non-polar compound. Using appropriate examples given,
produce a poster representing Compound A and Compound B. The poster must comply with the
following criteria:

i. According to the basic shape of 5 or 6 electron groups, suggest a suitable molecular formula
of Compound A and Compound B.

ii. Draw the Lewis structures of each compound.
iii. By applying VSEPR theory, predict its molecular shape and show the bond angles in the

molecules.
iv. Describe the differences in polarity and dipole moment of the molecules.
v. State the type of intermolecular forces present in both compounds.

Guideline for student:
1. Refer to scoring rubric guidelines to complete the task given.
2. Consultation with the lecturer should be done at least once before submission date.
3. Your structures must be different with your friends.

Suggestion List Of Structures:

PCl5 PHClF3 PI2HCl SClF2H3 SeF3Cl2H
PCl4H SCl6
PCl2F3 PFHCl3 PI2HF2 SeF6 SHCl5
SeF4Cl SHF5
PI2F3 PF5 AsF5 SeHF5
AsI2 SHFCl4
AsHI4 PF2Cl3 AsCl5 SeH2F4 SH2F4
AsF2Cl4 SFCl5
AsF3Cl2 PF2ClH2 AsH5 SeH3F3 SHCl5
AsHCl4 SHI5
PF2I3 PFCl2H2 AsFH4 SeCl6 SHCl2F3
PCl3FI
PI5 AsClF4 SeHCl5 SF6
SFCl5
PHI4 AsHF4 SeClF5

PHF4 AsHCl4 SeH2FCl2

PHCl5 AsHClF3 SeH3Cl3

PFI4 AsFClH3 SeF3Cl3

PFCl4 AsCl2FH2 SeF2Cl4

RUBRIC FOR A
CHEMIST
SESSION

TITLE: MOLECULAR
ATTRIBUTE 1 –critical thinking, problem solving, info

SUBATTRIBUTE 1

1.1 Originality 1 required feature 2 re
Poster must include all of the following features: met.

i. The design and idea of the poster must be the
result of student’s own creation and originality.

ii. Poster must be clear and able to explain the
task given without the need for additional oral
explanation.

iii. Creative (eg: use suitable material/multimedia)
iv. Neat and tidy.
v. Colored poster.

1.2 Coherently written academic discourse Both compound Both
with different diffe
Draw the Lewis structures of each compound. basic shape with with
ALL incorrect Lew
i. Both compounds have SAME basic shape. Lewis structure.
ii. Show ALL lone pair electron for surrounding

atoms.

ASSIGNMENT
TRY DK014

2020/2021

GEOMETRY POSTER
ormation management and lifelong learning skills rubric

2 3 45

equired features 3 required features 4 required features Meet ALL

met. met. met. required features.

h compound with Both compound Both compound Both compound
erent basic shape with SAME basic with SAME basic with SAME basic
h only 1 correct shape with ALL shape with only 1 shape with ALL
wis structure. incorrect Lewis correct Lewis correct Lewis
structure. structure. structure.

Or

Both compound
with different basic
shape with ALL
correct Lewis
structure.

1.3 Problem identification State incorrect Pola
type only
State the type of intermolecular forces present. intermolecular inter
force for both
i. Polar molecule: London Forces, Dipole-Dipole compounds. Non-
Forces, Hydrogen Bond (if any). incor
inter
ii. Non polar molecule: London Forces. force

1.4 Analysis Meet at least 1 Mee
correct required corre
Describe the differences in polarity and dipole moment feature for BOTH featu
of the molecules. Each molecule must include the compounds. ONE
following features in any order:

i. Show the polar arrow in the molecular shape.
ii. Relate the bond dipole with resultant dipole

moment.
iii. State the resultant dipole moment, µ=0 or µ≠0.
iv. State the polarity of the molecules.

1.5 Application Meet at least 1 Mee
correct required corre
By applying VSEPR theory, predict its molecular shape feature for BOTH featu
and show the bond angles in the molecules. compounds. ONE
Each molecule must include the following features in
any order:

i. State name molecular shape clearly. Give 1 list of Give
ii. Draw the molecular shape correctly. references with refer
iii. Show bond angle in the drawing. Only 1 required ALL
feature met. featu
1.6 Relevance of references

List 2 references from any source (website, portal,
journal, text book or any relevant source) based on
APA format.

References includes the following:
i. Related to chemistry content.
ii. Minimum 2 types source of reference.

iii. Comply APA format.

ar molecule: State Polar molecule: Polar molecule: State ALL correct
y 1 correct type State only 1 correct State 2 type type of
rmolecular force. type intermolecular intermolecular force intermolecular
force. with only 1 correct. force for both
-polar: State compounds.
rrect type Non-polar: Give Non-polar: Give
rmolecular correct type correct type
es. intermolecular intermolecular
forces. forces.

et at least 2 Meet at least 3 Meet ALL Meet ALL
ect required correct required required features required features
ures for only features for ONE for only ONE
E compound. compound. compound.

et at least 2 Meet at least 2 Meet ALL Meet ALL
ect required correct required required features required features
ures for only features for both for only ONE for BOTH
E compound. compounds. compound. compounds.

e 1 list of Give 2 list of Give 2 list of Give 2 and above
rences and meet references and references with list of references
L required Only 1 required Only 2 required and meet ALL
ures. feature met. features met. required features.