Chemistry Unit Review

Front

What is the chemical formula for water?

Back

H2O

Front

What is a molecule?

Back

A group of atoms joined together by chemical bonds.

Front

Oxygen, Nitrogen, Hydrogen, and Calcium are all examples of ______________________.

Back

elements.

Front

What type of mixture is characterized by a uniform composition throughout?

Back

homogeneous.

Front

Which one of the following is a compound? NaCl, O2, Hydrogen, He2

Back

NaCl.

Front

What is the smallest unit of an element that retains the properties of that element?

Back

Atom.

Front

What is a chemical bond?

Back

A force that holds atoms together in a molecule.

Front

What is the difference between a mixture and a compound?

Back

A mixture is a combination of substances that can be separated, while a compound is a substance formed when two or more elements chemically bond.

Front

What is an ion?

Back

A charged particle that has either lost or gained one or more electrons.

Front

What is the process of a solid turning into a liquid called?

Back

Melting.