Chemistry Fall Semester Exam 2024

Front

What is the primary property responsible for the formation of cubic lattice structures in ionic compounds like NaCl?

Back

Ionic bonds form between common positively and negatively charged ions in such a way as to keep like-charged ions far apart and oppositely charged ions close together.

Front

What is the oxidation number of sulfur in H2SO4?

Back

-2

Front

What is the common name for NH3?

Back

Ammonia

Front

What is the oxidation number of manganese in MnO₄⁻?

Back

+7

Front

What are the oxidation numbers in the compound Fe₂O₃?

Back

Fe = +3, O = -2

Front

Define ionic bond.

Back

An ionic bond is a type of chemical bond that occurs between positively and negatively charged ions, resulting from the transfer of electrons.

Front

What is the significance of oxidation numbers in compounds?

Back

Oxidation numbers indicate the degree of oxidation of an atom in a compound, helping to determine the electron transfer in redox reactions.

Front

Explain the concept of a crystal lattice.

Back

A crystal lattice is a three-dimensional arrangement of atoms or ions in a crystalline material, characterized by a repeating pattern.

Front

What is the oxidation state of oxygen in most compounds?

Back

-2

Front

What is the formula for calculating oxidation numbers in a neutral compound?

Back

The sum of the oxidation numbers of all atoms in a neutral compound is 0.