Methane, CH4\mathrm{CH_{4}}CH4, melts at −182 ∘C-182\,^\circ\mathrm{C}−182∘C and boils at −162 ∘C-162\,^\circ\mathrm{C}−162∘C. A sample of pure liquid methane is heated steadily until it boils.
Statement 1: while it boils, the forces between methane molecules are overcome
Statement 2: while it boils, the covalent bonds between the carbon and hydrogen atoms are broken
Statement 3: the temperature stays at −162 ∘C-162\,^\circ\mathrm{C}−162∘C until all the liquid has boiled
Which statements are correct?
1 only
1 and 3 only
2 and 3 only
1, 2 and 3
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.