Chemistry Unit Test

Front

What is a physical property?

Back

A characteristic of a substance that can be observed without changing its chemical composition, such as color, odor, or melting point.

Front

What happens to an atom when it loses electrons?

Back

It becomes positively charged, as the number of protons exceeds the number of electrons.

Front

What is found in the nucleus of an atom?

Back

Protons and neutrons are found in the nucleus, while electrons orbit around it.

Front

What changes in an atom when it becomes an ion?

Back

The number of electrons changes, resulting in a net charge.

Front

What is the charge of a neutron?

Back

A neutron has no charge; it is neutral.

Front

What is the charge of a proton?

Back

A proton has a positive charge.

Front

What is the charge of an electron?

Back

An electron has a negative charge.

Front

What is the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

Front

What is the mass number of an atom?

Back

The mass number is the total number of protons and neutrons in the nucleus.

Front

What is an ion?

Back

An ion is an atom or molecule that has gained or lost one or more electrons, resulting in a net charge.