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

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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