HONORS Chemistry First Semester Final Exam Review 24/25

Front

What varies between isotopes of an element?

Back

Neutrons and atomic mass.

Front

What is a characteristic of gases?

Back

Gases have fast-moving particles.

Front

What properties can only be observed when a substance changes into a different substance?

Back

Chemical properties.

Front

What is the atomic mass of an element?

Back

The weighted average of the masses of the isotopes of the element.

Front

How many electrons does Beryllium have?

Back

4.

Front

What is an isotope?

Back

Atoms of the same element with different numbers of neutrons.

Front

Define atomic number.

Back

The number of protons in the nucleus of an atom.

Front

What is a physical change?

Back

A change that does not alter the chemical composition of a substance.

Front

What is a chemical change?

Back

A change that results in the formation of new chemical substances.

Front

What is the difference between mass and weight?

Back

Mass is the amount of matter in an object; weight is the force exerted by gravity on that mass.