MOLECULAR CHEMISTRY EXAMINATION QUESTIONS
AND CORRECT ANSWER WITH EXPLANATION GRADED
A+ STUDY GUIDE SOUTHERN NEW HAMPSHIRE
UNIVERSITY
1. Molecular chemistry is the study of:
A. Molecules and their structure and behavior
B. Weather systems
C. Rock formation
D. Astronomy
Answer: A
Rationale: It focuses on molecular composition and interactions.
2. A molecule is:
A. Two or more atoms bonded together
B. A single proton
C. A neutron only
D. A free electron
Answer: A
Rationale: Basic chemical unit of compounds.
3. Covalent bonding involves:
A. Sharing electrons
B. Transferring electrons
C. Losing protons
D. Gaining neutrons
Answer: A
Rationale: Electron sharing between atoms.
4. Molecular formula shows:
A. Number of each atom in a molecule
B. Shape of molecule only
C. Charge only
D. Mass only
Answer: A
Rationale: Composition of a molecule.
,5. Empirical formula represents:
A. Simplest whole-number ratio of atoms
B. Exact molecular structure
C. 3D shape
D. Electron arrangement only
Answer: A
Rationale: Simplified composition.
6. Structural formula shows:
A. Arrangement of atoms and bonds
B. Only atoms present
C. Only charge
D. Only mass
Answer: A
Rationale: Connectivity of atoms.
7. Molecular geometry is determined by:
A. Electron pair repulsion
B. Atomic mass
C. Temperature only
D. Pressure only
Answer: A
Rationale: VSEPR theory.
8. VSEPR theory explains:
A. Shape of molecules
B. Atomic mass
C. Nuclear structure
D. Ionic charge
Answer: A
Rationale: Electron pair repulsion model.
9. Linear molecular shape has bond angle:
A. 180°
B. 90°
C. 120°
D. 109.5°
Answer: A
Rationale: Straight-line geometry.
, 10. Tetrahedral geometry has bond angle:
A. 109.5°
B. 90°
C. 180°
D. 120°
Answer: A
Rationale: sp³ hybridization angle.
11. Water molecule shape is:
A. Bent
B. Linear
C. Square planar
D. Trigonal planar
Answer: A
Rationale: Lone pair repulsion.
12. Carbon dioxide shape is:
A. Linear
B. Bent
C. Tetrahedral
D. Pyramidal
Answer: A
Rationale: No lone pairs on carbon.
13. Ammonia (NH₃) shape is:
A. Trigonal pyramidal
B. Linear
C. Square planar
D. Octahedral
Answer: A
Rationale: Lone pair on nitrogen.
14. Methane (CH₄) shape is:
A. Tetrahedral
B. Linear
C. Bent
D. Planar
Answer: A
Rationale: sp³ hybridized carbon.
AND CORRECT ANSWER WITH EXPLANATION GRADED
A+ STUDY GUIDE SOUTHERN NEW HAMPSHIRE
UNIVERSITY
1. Molecular chemistry is the study of:
A. Molecules and their structure and behavior
B. Weather systems
C. Rock formation
D. Astronomy
Answer: A
Rationale: It focuses on molecular composition and interactions.
2. A molecule is:
A. Two or more atoms bonded together
B. A single proton
C. A neutron only
D. A free electron
Answer: A
Rationale: Basic chemical unit of compounds.
3. Covalent bonding involves:
A. Sharing electrons
B. Transferring electrons
C. Losing protons
D. Gaining neutrons
Answer: A
Rationale: Electron sharing between atoms.
4. Molecular formula shows:
A. Number of each atom in a molecule
B. Shape of molecule only
C. Charge only
D. Mass only
Answer: A
Rationale: Composition of a molecule.
,5. Empirical formula represents:
A. Simplest whole-number ratio of atoms
B. Exact molecular structure
C. 3D shape
D. Electron arrangement only
Answer: A
Rationale: Simplified composition.
6. Structural formula shows:
A. Arrangement of atoms and bonds
B. Only atoms present
C. Only charge
D. Only mass
Answer: A
Rationale: Connectivity of atoms.
7. Molecular geometry is determined by:
A. Electron pair repulsion
B. Atomic mass
C. Temperature only
D. Pressure only
Answer: A
Rationale: VSEPR theory.
8. VSEPR theory explains:
A. Shape of molecules
B. Atomic mass
C. Nuclear structure
D. Ionic charge
Answer: A
Rationale: Electron pair repulsion model.
9. Linear molecular shape has bond angle:
A. 180°
B. 90°
C. 120°
D. 109.5°
Answer: A
Rationale: Straight-line geometry.
, 10. Tetrahedral geometry has bond angle:
A. 109.5°
B. 90°
C. 180°
D. 120°
Answer: A
Rationale: sp³ hybridization angle.
11. Water molecule shape is:
A. Bent
B. Linear
C. Square planar
D. Trigonal planar
Answer: A
Rationale: Lone pair repulsion.
12. Carbon dioxide shape is:
A. Linear
B. Bent
C. Tetrahedral
D. Pyramidal
Answer: A
Rationale: No lone pairs on carbon.
13. Ammonia (NH₃) shape is:
A. Trigonal pyramidal
B. Linear
C. Square planar
D. Octahedral
Answer: A
Rationale: Lone pair on nitrogen.
14. Methane (CH₄) shape is:
A. Tetrahedral
B. Linear
C. Bent
D. Planar
Answer: A
Rationale: sp³ hybridized carbon.
