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?