Classify the reaction endothermic or exothermic and give the change in enthalpy of the reaction.

Si (2) + 2 Cl₂ (g) $\displaystyle \to$  SiCl₄ (g) +  748 kJ

The heat energy in the reaction is Select an answer released absorbed .

This makes the reaction Select an answer endothermic exothermic .

So, the change in enthalpy would have a Select an answer positive negative sign.