Purity

Question 1

What does pure mean?

Answer 1

Only made up of a single element or compound.

Question 2

When is something not pure anymore and what is that called?

Answer 2

If you have more than one compound present or different elements, then you have got a mixture, and it is impure

Question 3

What does every pure substance have?

Answer 3

A specific sharp melting point and boiling point. eg pure ice melts at 0 degrees and pure water boils at 100 degrees

Question 4

How can you tell if a substance is a mixture or pure?

Answer 4

Impure substances will melt over a range of temperatures, while a pure substance will have a horizontal lune on a graph (sharp)