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CMY 117 2021
Faculty of Natural and Agricultural Sciences
Fakulteit Natuur- en Landbouwetenskappe
Lefapha la Disaense tša Tlhago le Tomo
Practical 2: Additional Questions
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This document does NOT need to be submitted anywhere
Instructions
These additional practice questions will not form a part of the marking
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Complimentary information can be found within the “Practical 2” folder on ClickUP.
For all your working, you are expected to follow the steps numbered (1) through to (11) set out in the tables below.
For Lewis dot structures, use different symbols for the valence electrons of the central atom and different terminal atoms.
Show all lone pairs.
For anions add electron(s) to the most electronegative atom(s); for cations remove the electron from the least
electronegative atom (remember to use brackets to indicate the charge of the molecule).
Be reminded of the octet rule that needs to be followed, and exceptions to the octet rule from period 3 onwards.
For the three-dimensional (3-D) Lewis line structure drawings use lines, wedges and broken lines (dashes) for bonds, show
all lone pairs (also on terminal atoms) and, - bond angles.
Bond angles must be shown between three atoms, never show bond angles where a lone pair is included (discussed in
lectures)
Show all individual dipole moments on the 3-D sketch, as well as the resultant dipole moment if applicable (only necessary
for neutral molecules).
Step (11) should be left out when molecules are charged; consequently, dipole moments and resultant dipole moments are
not required to be shown.
>> GROUP D: Additional questions
Additional questions (will not be marked) to work through in your own time for practice:
Formula
𝑨𝑿𝟒 𝑬
Lewis dot structure
Construct a neutral molecule with this general formula, using sulphur (𝑆) as the central atom
(𝐴) and any other suitable non-metals (except hydrogen) as terminal atoms (𝑋).
3-D Lewis line structure (with bond angles)
Electron pair geometry
Molecular geometry
Note: Multiple answers are possible for this question (tests your ability to follow instructions)
1
Group A&B-type questions:
AsCl4 BrO2F
SF6
NO2F
IF2 ICl2 SnCl2
H3O +
ClO2 IO2 TeCl4
CO3 2 SnCl2
NOCl
XeO4
AsH3
IO2F2 SFO3 BeF2
COS
SeOF2
XeS2O2
NO3 NH2 -
SbCl3
SiF6 2 BiCl4 +
SeO4 2 AsBr2Cl
SO3
SCN CHIBrCl
HIO2
HNO2
Group C-type questions:
HClO4
HNO3
2