e.g. the melting point of hydrogen sulphide Is -85 degrees and its boiling point is -61 degrees.


Anything below its melting point is a solid.
Anything above its melting point and below its boiling point is a liquid
Anything above it boiling point is a gas
25 degrees is above the boiling point (which is -61 degrees)
So this must be a.........

Tabitha Farrant
By elliott heath

An alkali is a compound with particular chemical properties including turning litmus blue and neutralizing acids
An alkali has a pH of more than 7

Tabitha Farrant
When do you normally start revising for exams?