VSEPR Theory/Molecular Geometry

A covalent bond in which there is an unequal attraction for the shared electrons is.

• Nonpolar Bond

• Polar Bond

• Ionic Bond

• Metallic Bond

Answer explanation

A polar bond is formed when there is an unequal attraction for the shared electrons between atoms, resulting in a slight positive and negative charge distribution.

What is the VSEPR Theory?

• Chemical bonding that results from the sharing of electron pairs between two atoms.

• A mutual attraction between the nuclei and valence electrons of different atoms that binds the atoms together.

• States that repulsion between the sets of valence-level electrons surrounding an atom causes these sets to be oriented as far apart as possible.

• A charged group of covalently bonded atoms.

Answer explanation

States that repulsion between the sets of valence-level electrons surrounding an atom causes these sets to be oriented as far apart as possible.

Write the name for the following binary molecule: C₂H₆.

• Carbon Hydrogen

• Carbon Hexahydride

• Dicarbon Hexahydride

• Dicarbon Hexahydroxide

Answer explanation

The correct name for the binary molecule C2H6 is Dicarbon Hexahydroxide, as it consists of two carbon atoms and six hydrogen atoms.

What is the correct Lewis structure for SiF4?

• Diagram A

• Diagram B

• Diagram C

• Diagram D

Answer explanation

The correct Lewis structure for SiF4 is Diagram A because it shows Silicon with four Fluorine atoms bonded to it, satisfying the octet rule.

The VSEPR formula for a molecule of type AB₂E₂ tells you that the molecule is made up of

• a central atom A, with two B atoms and two E atoms bonded to it. The shape is Bent.

• a central atom A, with two B atoms bonded to it and two lone pairs. The shape is Bent.

• a central atom A, with two B atoms bonded to it by two bonding electron pairs. The shape is Tetrahedral.

• a central atom A, with two B atoms bonded to it and two lone pairs. The shape is Trigonal Pyramidal.

Answer explanation

The molecule AB2E2 has a central atom A with two B atoms bonded to it and two lone pairs, resulting in a Bent shape.

What is the correct name for the following ionic compound MgBr₂?

• Magnesium Bromine

• Bromine Magnesium

• Magnesium Bromide

• Bromine Magneside

Answer explanation

The correct name for the ionic compound MgBr2 is Magnesium Bromide, as it follows the naming convention for ionic compounds where the metal name (Magnesium) is followed by the non-metal name with an -ide ending (Bromide).

What shape does a water molecule form?

• Bent

• Linear

• Trigonal Planar

• Trigonal Pyramidal

Answer explanation

A water molecule forms a bent shape, which is the correct choice among the options provided.

When nickel combines with fluorine to form nickel (III) fluoride, the charge of the nickel ion is

• Ni⁺¹

• Ni⁺²

• Ni⁺³

• Ni⁺⁴

Answer explanation

When nickel combines with fluorine to form nickel (III) fluoride, the charge of the nickel ion is Ni⁺³.

Is the molecule to the right polar or nonpolar, why?

• Polar, because the molecule has symmetry, and the dipoles move outward.

• Polar, because the molecule lacks symmetry, and the dipoles move inward.

• Non-polar, because the molecule has symmetry, and the dipoles move outward.

• Non-polar, because the molecule lacks symmetry, and the dipoles move inward.

Answer explanation

Polar, because the molecule lacks symmetry, and the dipoles move inward.

Letter A and B are pointing to what type of intermolecular and intramolecular force in the figure below?

• A = intermolecular – hydrogen bond B = intramolecular – dipole – dipole

• A = intramolecular – covalent bond B = intermolecular – dipole – dipole

• A = intramolecular – covalent bond B = intermolecular – Hydrogen bond

• A = intermolecular – London-Dispersion Forces B = intramolecular – Ionic Bond

Answer explanation

A is pointing to an intramolecular covalent bond, while B is pointing to an intermolecular Hydrogen bond.