Honors Chemistry Unit 4 Practice Test

Front

What is the chemical formula for calcium hydrogen sulfite?

Back

Ca(HSO₃)₂

Front

Why do ionic compounds generally have high melting and boiling points?

Back

Because ionic bonds are strong and require a lot of energy to break.

Front

In a molecule with trigonal planar geometry, how many bonding pairs are around the central atom?

Back

3

Front

What is the name of the anion with the formula ClO₂⁻?

Back

chlorite ion.

Front

In a molecular structure, where is hydrogen typically found?

Back

as a terminal atom.

Front

Define ionic bond.

Back

A chemical bond formed between two ions with opposite charges.

Front

What is the significance of the octet rule in chemistry?

Back

Atoms tend to bond in a way that gives them eight valence electrons, achieving a stable electron configuration.

Front

What is the difference between a covalent bond and an ionic bond?

Back

Covalent bonds involve the sharing of electron pairs between atoms, while ionic bonds involve the transfer of electrons from one atom to another.

Front

What is the molecular geometry of a molecule with four bonding pairs and no lone pairs?

Back

Tetrahedral.

Front

What is the formula for calculating the number of valence electrons in an atom?

Back

The number of valence electrons is equal to the group number of the element in the periodic table.