Semester 1 MidExam 2024

Front

What is the total number of protons and neutrons in the nucleus of an atom called?

Back

Mass number.

Front

What rule states that each of the p orbitals at a particular energy level must receive one electron before any can have two?

Back

Hund's rule.

Front

What is an example of a homogeneous mixture?

Back

Air.

Front

What do all atoms of the same element have in common?

Back

Atomic number.

Front

Which of the following is not a physical change: burning, boiling, cutting, or grinding?

Back

Burning.

Front

What is the definition of atomic number?

Back

The number of protons in the nucleus of an atom.

Front

What is the definition of a homogeneous mixture?

Back

A mixture that has a uniform composition throughout.

Front

What is the Pauli exclusion principle?

Back

No two electrons in an atom can have the same set of four quantum numbers.

Front

What is an example of a physical change?

Back

Boiling water.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change does not alter the substance's chemical composition, while a chemical change does.