AP Chemistry MCQ Unit 1-2

An alloy is a mixture of two or more elements, where at least one is a metal. Alloys have different properties than their constituent elements, such as increased strength or resistance to corrosion.

As the number of bonds between two atoms increases, bond strength increases while bond length decreases.

The bond angle in a tetrahedral molecular geometry is approximately 109.5 degrees.

HCO3- has a shorter C-O bond length compared to CO3^2- due to the presence of a hydrogen atom, which affects the electron distribution.

Na+ represents a sodium ion that has lost one electron, resulting in a positive charge.

The octet rule states that atoms tend to bond in such a way that they have eight electrons in their valence shell, achieving a stable electron configuration.

The molecular geometry of CO2 is linear, with a bond angle of 180 degrees.

Electronegativity is the ability of an atom to attract electrons in a bond. Differences in electronegativity between atoms can lead to polar or nonpolar covalent bonds.

A covalent bond is a chemical bond formed by the sharing of electron pairs between atoms.

Resonance structures are used to represent the delocalization of electrons in molecules where the bonding cannot be expressed by a single Lewis structure.