Purity

Question 1

What is meant by purity in chemistry?

Answer 1

Usually you refer to a substance as being pure you mean that nothing has been added to it, so it’s in its natural state, e.g. pure milk or beeswax

Question 2

Chemical definition for purity

Answer 2

In chemistry, a pure substance is something that only contains one compound or element throughout - not mixed with anything else.

Question 3

What can melting or boiling points tell us how pure a substance is?

Answer 3

A chemically pure substance will melt or boil at a specific temperature
Test for purity would be to measure its boiling/melting point and then compare it with the melting/point of the pure substance (found in a data book). The purer the sample is the closer it is to the actual points
Impurities in your sample will lower the melting point and increase the melting range, also increase the boiling point and boiling at a range of temperatures