A reaction is carried out in water at 20 ∘C20\,^\circ\mathrm{C}20∘C. It makes three products, W, X and Y.
The table shows some information about the products.
| Product | Melting point (∘C^\circ\mathrm{C}∘C) | Boiling point (∘C^\circ\mathrm{C}∘C) | Soluble in water? |
|---|---|---|---|
| W | 772 | 1935 | yes |
| X | 1600 | 2230 | no |
| Y | -219 | -183 | no |
Which state symbols should be used for W, X and Y in the equation for the reaction?
W (aq), X (s), Y (g)
W (s), X (s), Y (l)
W (aq), X (aq), Y (g)
W (l), X (s), Y (g)
55 exam-style questions on OCR GCSE Chemistry 3.1 Introducing chemical reactions, covering 3.1.1 Writing formulae and balanced chemical equations, 3.1.2 Formulae of compounds from ions, and state symbols, 3.1.3 Conservation of mass and observed changes in mass, 3.1.4 Half equations and balanced ionic equations, 3.1.5 The mole and the Avogadro constant, and 3.1.6 Stoichiometry, limiting reactants and reacting masses. Each one has a worked solution and a mark scheme showing where the marks go.