# Question 77a01

May 3, 2016

$C a C {N}_{2}$

#### Explanation:

Equation

$C a {C}_{2} + {N}_{2} \to C a C {N}_{2} + C$ (at 1100C)

$C a C {N}_{2} \to$Calcium cyanamide used as fertilizer.

May 3, 2016

None of these, actually. You get calcium cyanamide (https://en.wikipedia.org/wiki/Calcium_cyanamide), "Ca(CN"_2")#.

#### Explanation:

Calcium cyanamide is not the same as calcium cyanide, which is $\text{Ca(CN")_2}$.

Cyanamide has two nitrogen atoms attached to one carbon like this:

${\text{N"^{-}="C"="N}}^{-}$

Two cyanide ions would of course have the nitrogen attached to separate carbon atoms and the negative charge formally on carbon not nitrogen:

$\text{C"^{-}-="N}$
$\text{C"^{-}-="N}$

Calcium cyanamide has several applications including a nitrogen source in soul fertilizer -- where cyanide would be a poor choice indeed!