Pure and impure substances

Question 1

A pure substance is made of only one type of what?

Answer 1

One type of element or one type of compound

Question 2

A pure substance cannot be what?

Answer 2

Appear substance can’t be separated into anything simpler without a chemical reaction

Question 3

A pure substance has a fixed what and what points?

Answer 3

A pure substance has a fixed melting and boiling points

Question 4

What change the melting point and boiling points?

Answer 4

Impurities