Chemistry · BGCSE / Bonding and structure
StructuredPast exam questionForm 5 · BGCSE
The metals sodium and magnesium are found in period 3 of the Periodic Table. Sodium reacts with halogens to form sodium halides. The equation between magnesium and oxygen is 2Mg(s) + O₂(g) → 2MgO(s). This reaction is exothermic.
- aDescribe, by means of a simple diagram (drawn on paper), the lattice structure of an ionic compound such as sodium chloride. [2]
- bState the number of valency electrons in an atom of magnesium. [1]
- cUsing the ideas of bond breaking and bond forming explain why this reaction is exothermic. [3]
You'll mark your own answer against the marking guide when you hand it in.
Source: BEC BGCSE Chemistry 2013, Paper 3, Question 4
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