What is the formula for calculating formal charge?

Valence electrons – (lone electrons + ½ shared electrons)

Which of the following statements about resonance is correct?

Resonance structures differ only in the arrangement of electrons.

What is the difference between electron geometry and molecular geometry?

Molecular geometry excludes lone pairs, electron geometry includes them.

What is the main principle of VSEPR theory?

Electron pairs repel each other to minimize repulsion.

What is the main reason for drawing resonance structures?

To describe delocalized electrons in a molecule

What do resonance structures represent?

All possible structures of the same molecule

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CHEM PASS#19

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Questions 20

Answers

1
What is the molecular geometry of CH₄?
Bent
Trigonal planar
Tetrahedral
Linear
2
What is the formula for calculating formal charge?
Valence electrons – (lone electrons + ½ shared electrons)
Total electrons – (bonding electrons + lone electrons)
None of the above
Valence electrons – (bonding electrons + nonbonding electrons)
3
What molecular geometry does a molecule with 2 bonding pairs and 1 lone pair have?
Tetrahedral
Linear
Trigonal pyramidal
Bent
4
Which of the following statements about resonance is correct?
Resonance structures always have the same stability.
Resonance structures differ only in the arrangement of electrons.
Resonance structures are in equilibrium.
Resonance structures have different molecular formulas.
5
Which molecule is an example of a trigonal bipyramidal structure?
NH₃
XeF₄
PCl₅
CH₄
6
Which molecule can exhibit resonance?
CH₄
O₃
H₂O
CO₂
7
Which molecule has a linear shape?
NH₃
H₂O
CH₄
CO₂
8
What is the difference between electron geometry and molecular geometry?
Electron geometry is based on resonance structures.
Molecular geometry excludes lone pairs, electron geometry includes them.
They are always the same.
Molecular geometry includes formal charges.
9
What is the total formal charge of a neutral molecule?
Cannot be determined
Depends on the molecule
1
0
10
What is the main principle of VSEPR theory?
Electron pairs repel each other to minimize repulsion.
Electrons orbit the nucleus in fixed paths.
Bond angles are determined by the type of atoms.
Electrons in the same shell attract each other.
11
What is the formal charge of oxygen in a molecule of CO₂?
0
2
1
3
12
What is the main reason for drawing resonance structures?
To minimize energy calculations
To explain molecular polarity
To describe delocalized electrons in a molecule
To predict molecular geometry
13
What is the electron geometry of SF₆?
Trigonal bipyramidal
Octahedral
Tetrahedral
Linear
14
What do resonance structures represent?
All possible structures of the same molecule
Different molecules
Isomers
A single, most stable structure
15
What is the molecular geometry of XeF₄?
Octahedral
Bent
Square planar
Tetrahedral
16
What is the geometry of NH₃ according to VSEPR?
Bent
Trigonal pyramidal
Tetrahedral
Trigonal planar
17
Which molecule has zero formal charges on all atoms?
H₃O⁺
NH₄⁺
CO₂
O₃
18
What is the bond angle in a trigonal planar molecule?
120°
109.5°
90°
180°
19
How are resonance structures connected in diagrams?
With dashed lines
With double-headed arrows
No connection is shown
With single-headed arrows
20
Which formal charge is preferred when drawing a Lewis structure?
Positive charges on less electronegative atoms
Negative charges on more electronegative atoms
Positive charges on more electronegative atoms
Both b and c

CHEM PASS#19 Flashcards | StudBud