Two substances P and Q have melting and boiling points shown. P: −114 ∘C-114\,^\circ\mathrm{C}−114∘C and 78 ∘C78\,^\circ\mathrm{C}78∘C; Q: 801 ∘C801\,^\circ\mathrm{C}801∘C and 1413 ∘C1413\,^\circ\mathrm{C}1413∘C. At 20 ∘C20\,^\circ\mathrm{C}20∘C, their states are
P solid, Q liquid
P liquid, Q gas
P gas, Q solid
P liquid, Q solid
84 exam-style questions on Edexcel GCSE Chemistry 3.1 States of matter, covering 3.1.1 The three states of matter and changes of state. Each one has a worked solution and a mark scheme showing where the marks go.