Pure substances vs mixtures

Question 1

What is a pure substance?

Answer 1

Single element or a single compound that contains no other substances

Pure substances have a fixed melting and boiling point.

Question 2

What is a mixture?

Answer 2

Two or more different substances not chmeically combined

Mixtures are seen as impure substances

Question 3

What is an impure substance?

Answer 3

Substances/ mixtures that boild over a range of different temperatures.

Question 4

How can the melting and voiling points be shown?

Answer 4

• Hetaing curve
• Cooling curve

If there is a straight line that clearly defines a specphic melting/ boiling point temperature than the substance is pure but if there is not a clear straigh line which defines a spechpic melting and boiling point and shows varied temepratures the susbstance is impure.