Advanced level 2026 South West mock Chemistry 2
Advanced level 2026 South West mock Chemistry 2
SECTION A: PHYSICAL AND GENERAL CHEMISTRY
1. (a) (i) What is a standard solution?
(ii) What mass of sodium carbonate ($\text{Na}_2\text{CO}_3$) is needed to prepare $500\text{ cm}^3$ of $0.2\text{ moldm}^{-3}$ solution?
(iii) How much water is needed to dilute the solution in a (ii) to $0.04\text{ moldm}^{-3}$?
b) In a titration experiment, $25\text{ cm}^3$ of sodium chloride solution completely reacted with $20\text{ cm}^3$ of a $0.1\text{ moldm}^{-3}$ solution of silver nitrate.
(i) Which indicator is suitable for this titration?
(ii) Calculate the molarity of the sodium chloride solution.
c) Complete the table below by filling in the coordination number and the number of particles present for the unit cells mentioned:
| Type of unit cell | Coordination number | Number of particles per unit cell |
| Cubic close pack or face centered cubic | ||
| Body centered cubic |
d) A Born Haber cycle is used to calculate the lattice energy of an ionic compound
(i) What do you understand by lattice energy?
