AP Chem Review Units 1 -4

Front

What are noble gases?

Back

Noble gases are a group of chemical elements that are odorless, colorless, monatomic gases with very low chemical reactivity. They include helium, neon, argon, krypton, xenon, and radon.

Front

What type of bonding results in materials with the highest melting and boiling points?

Back

Ionic bonding results in materials with the highest melting and boiling points due to the strong electrostatic forces between the positively and negatively charged ions.

Front

What is the Lewis Dot Structure for ammonia (NH3)?

Back

The Lewis Dot Structure for ammonia (NH3) shows a nitrogen atom (N) in the center with three hydrogen atoms (H) bonded to it, and a lone pair of electrons on the nitrogen.

Front

Which nickel compound contains the highest percentage of nickel by mass?

Back

NiO contains the highest percentage of nickel by mass compared to NiCl2, NiO2, and Ni3(PO4)2.

Front

Why is the F⁻ ion smaller than the O²⁻ ion?

Back

F⁻ is smaller than O²⁻ because F⁻ has a larger nuclear charge, which pulls the electrons closer to the nucleus.

Front

What is electronegativity?

Back

Electronegativity is a measure of the tendency of an atom to attract a bonding pair of electrons.

Front

What is the octet rule?

Back

The octet rule states that atoms tend to gain, lose, or share electrons in order to have eight electrons in their valence shell, achieving a stable electron configuration.

Front

What is the difference between ionic and covalent bonding?

Back

Ionic bonding involves the transfer of electrons from one atom to another, resulting in the formation of charged ions, while covalent bonding involves the sharing of electrons between atoms.

Front

What is a polar covalent bond?

Back

A polar covalent bond is a type of covalent bond where the electrons are not shared equally between the two atoms, resulting in a slight charge difference.

Front

What is the significance of the atomic number?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity and its position in the periodic table.