Chem 2017 p1 mistakes

define enthalpy of lattice formation

the enthalpy change when 1 mol of a solid ionic compound is formed from its gaseous ions

A calculation of the enthalpy of lattice formation of silver iodide based on a

perfect ionic model gives a smaller numerical value than the value calculated in

Question 1.2

Explain this difference.

Silver iodide has covalent character, forces holding bonds together are stronger

Predict whether the ph of magnesium hydroxide is larger than, smaller than or the same as the ph of calcium hydroxide

smaller because mg(oh)2 is less soluble

Describe a test to distinguish betweeen sodium oxide and phosphors oxide

-add water then litmus paper. Sodium blue phosphorus red

State why the chloride ions in [Cu(H2O)6]Cl2 are not ligands

No dative covalent bond between them and central metal ion

Explain why colorimetry cannot be used to determine the concentration of

solutions containing [CuCl2]−

Has a full 3d subshell, cant absorb visible light so is colourless