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CHE2.4 Lewis Diagrams, Shapes, Polarity Flashcards | StudBud
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CHE2.4 Lewis Diagrams, Shapes, Polarity
CHE2.4 Lewis Diagrams, Shapes, Polarity
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CHE2.4 so far...
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Questions
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Answers
1
What is the approximate bond angle for bent (3-regions)?
109°
90°
180°
120°
2
A single covalent bond is sometimes known as a 'sigma' bond.
False
True
3
What does solubility of molecules usually depend on?
If both substances are polar
If both substances are non-polar
Opposite polarites
The same polarity (polar or non-polar)
4
A molecule is a substance containing...
non-metals only
A metal and a non-metal
Metals only
any small element
5
Which of these molecules do you expect to be polar?
N2
BF3
COCl2
CF4
6
Name the shape that contains 4 negative regions, with 3 bonded and one lone pair.
trigonal pyramidal
bent (3-regions)
trigonal planar
bent (4-regions)
7
A non-polar molecule can contain polar bonds.
True
False
8
A 'dipole' arises in a bond due to...
a difference in mass
a difference in oxidation state
a difference in electronegativity
similar electronegativity
9
What is the approximate bond angle for a trigonal planar?
180°
109°
90°
120°
10
Payment for your sciPad was due...
Next term
Last week
Next week
Today...
11
How many valence electrons must be drawn for Silicon?
3
6
4
5
12
Electronegativity refers to the tendency of an atom...
to form ionic bonds
to attract valence electrons
to form dipoles
To bind neutrons/protons
13
A covalent bond is...
An electrostatic charge
A shared pair of electrons
A shared electron
An intermolecular force
14
A non-polar molecule has no net dipole.
True
False
15
Which of these molecules would not be linear?
H2O
HCN
BeF2
CO2
16
A lone pair counts as one region of negative charge.
False
True
17
In a Lewis dot diagram, you must only draw the valence electrons for each atom
True
False
18
A double covalent bond is equivalent to two regions of negative charge.
True
False
19
How much do
most
of you owe me for a sciPad which is essential for Level 2 Chemistry?
$35
$25
$20
$30
20
What are 'dashes and wedges' used for?
To show short and long bonds.
To show intermolecular bonds.
To show bonds 'in' and 'out' the plane.
To indicate dipoles.
21
Which of the elements below would be the most electronegative?
O
H
Na
S
22
Which of these atoms may have exceptions to the Octet rule?
F
Be
C
Br
23
Name the shape that contains 4 negative regions, all bonded.
bent (4-regions)
trigonal pyramidal
tetrahedral
Linear
24
Identify the imposter (not a molecule)
NaK
XeF4
CO2
SiO2
25
How many valence electrons must be drawn for Nitrogen?
5
6
4
3
