Chemistry Final 2018

When atoms combine to form a molecule by sharing electrons, what type of bonds are formed?

• covalent

• hydrogen

• ionic

• polar ionic

A metallic bond is formed between

• a metal atom and a hydrogen atom

• a metal atom and a nonmetallic atom

• a metal atom and a noble gas

• two metal atoms

The bonds found in C2H4 are

• covalent

• ionic

• metallic

• polar

Which is a covalent compound

• Mg3N2

• NaCl

• NaF

• SiF4

Salts are compounds that form a crystal lattice. Which types of bonds are responsible for this lattice formation?

• covalent

• hydrogen

• ionic

• polar

The electrostatic attraction between atoms in a salt is

• strongest when the ions are small

• weakest when one of the ions is hydrogen (atomic number 1)

• strongest when one of the ions is potassium (atomic number 19)

• strongest when one of the ions is iodine (atomic number 53)

At room temperature, which substance has the weakest intermolecular forces?

• oxygen

• salt

• steel

• uranium

Why are Lewis dot structures used?

• to show what type of bonds are formed

• to show valence electrons

• to show electronegativity values

• to show intermolecular forces

Fluorine has seven electrons in its Lewis dot structure. What is the electron configuration for fluorine?

• 1s²2s²

• 1s²2s²2p³

• 1s²2s²2p⁴

• 1s²2s²2p⁵

The electron configuration for an atom of iron is [Ar] 3d⁶4s². Which is the correct Lewis dot structure for iron?