Chemical reactions that are characterized by or formed by giving off heat are:

An unstable physical mixture of two or more immiscible substances is a(n):

A freckle is an example of a mark on the skin called a:

A closed comedo is also known as a blackhead.  

During a relaxer strand test, hair that is pressed to the scalp and continues to curl is:

A substance, usually liquid, that dissolves another substance to form a solution is a(n):

The oxidation of haircolor is an example of a physical change.

Most organic substances do not burn because they do not cotain carbon.

A solution with a pH value of 7 indicates a(n):

Substances used to neutralize acids or raise the pH of many hair products are: