8.16—The reasons for the trends in thermal stability of the nitrates and the carbonates of the elements in Groups 1 and 2

Understand the reasons for the trends in thermal stability of the nitrates and the carbonates of the elements in Groups 1 and 2 in terms of the size and charge of the cations involved.

Use —the reasons for the trends in thermal stability of the nitrates and the carbonates of the elements in groups 1 and 2 to connect the rule to the data and decision in the question.

This matters because —the reasons for the trends in thermal stability of the nitrates and the carbonates of the elements in groups 1 and 2 determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply —the reasons for the trends in thermal stability of the nitrates and the carbonates of the elements in groups 1 and 2 to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: —The reasons for the trends in thermal stability of the nitrates and the carbonates of the elements in Groups 1 and 2 is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.