OCR Advanced GCE in Chemistry/Periodic Table: Period 3/Answers

1. Reaction with water - Hydrolysis:

SiCl₄(l) + 2H₂O(l) ---> SiO₂(s) + 4HCl(g)

White fumes hydrogen chloride gas

Acid base reaction - solid magnesium oxide dissolves

MgO(s) + HCl(aq) ---> MgCl(aq) + H₂O(l)

2. Intermediate - no

3. sodium

4. Use steam

5. PCl₃ - excess chlorine

6. see page