Complete the reactions<br>(i) $$\text{CaO} + \text{C} \xrightarrow{\Delta} \text{A} + \text{B}$$<br>(ii) $$\text{A} + \text{N}_2 \xrightarrow[\text{furnace}]{\text{electric}} \text{D} + \text{graphite}$$<br>(iii) $$\text{D} + \text{H}_2\text{O} \rightarrow \text{E} + \text{NH}_3$$<br>Identify the compound A __________, B __________, D __________, E __________

PLACEHOLDER ANSWER - the answer is four compounds. (i) $$\text{CaO} + 3\text{C} \rightarrow \text{CaC}_2 + \text{CO}$$, so A is $$\text{CaC}_2$$ and B is CO. (ii) $$\text{CaC}_2 + \text{N}_2 \rightarrow \text{CaCN}_2 + \text{C}$$, so D is calcium cyanamide $$\text{CaCN}_2$$. (iii) $$\text{CaCN}_2 + 3\text{H}_2\text{O} \rightarrow \text{CaCO}_3 + 2\text{NH}_3$$, so E is $$\text{CaCO}_3$$.