Which of the following substances (A,B,C,D) are impure? (select 2 answers) 

Substance Melting point (°C) 

Two or more substances mingled together, but not chemically combined are known as a _______

An _________ is made up of one or more of the same kind of atom chemically combined. 


A _________ is made up of different kinds of atoms chemically combined. 

Which of the following is a pure substance?