Ammonia (NH3NH_3NH3) is a common industrial refrigerant. It has a melting point of −78∘C-78^\circ\text{C}−78∘C and a boiling point of −33∘C-33^\circ\text{C}−33∘C.
A sample of pure ammonia is maintained inside a temperature-controlled cold storage chamber at a constant temperature of −40∘C-40^\circ\text{C}−40∘C.
What is the physical state of the ammonia under these conditions?
Gas
Liquid
Solid
Aqueous
27 exam-style questions on OCR GCSE Chemistry The particle model. Each one has a worked solution and a mark scheme showing where the marks go.