Advanced level 2026 littoral regional mock chemistry 2

Based on the image provided, here is the extracted data and structured questions for this chemistry section.

2.

(a) A carbonate of metal M has formula $M_2CO_3$. The equation for the reaction of $M_2CO_3$ with hydrochloric acid is given below.

$0.245\text{g}$ of $M_2CO_3$ was found to exactly neutralize $23.6\text{cm}^3$ of $0.15\text{M}$ hydrochloric acid.

• (i) Calculate the number of moles of hydrochloric acid.

• (ii) Calculate the number of moles of $M_2CO_3$.

• (iii) Calculate the relative molecular mass of $M_2CO_3$.

• (iv) Calculate the relative atomic mass of the metal M.

  (4 marks)

(b)

• (i) Name the theory that is used to explain the shapes of simple covalent molecules and ions.

• (ii) Complete the table below by either giving the shapes, bond angle or the species.

  | Species | Shape | Bond angle |

  | :— | :— | :— |

  | $CH_4$ | | |

  | | | $120^\circ$ |

  (3 marks)

(c) Identify the types of intermolecular forces in each of the following substances.

| Substance | Intermolecular force |

| :— | :— |

| Ammonia | |

| Hydrogen chloride | |

(2 marks)

(d) Water and ethanol mixture deviate positively from Raoult’s law and forms an azeotropic mixture.

• (i) What is an azeotropic mixture?

Would you like me to work through the calculations for the relative atomic mass of metal M or provide the VSEPR theory shapes for the table?