Question

The enthalpy (AH) is +624.7 kJ for the following reaction. How would you classify this reaction? (Explain)

SiO2(g) + 3C(s) --> SIC(s) +2CO(g)

A.exothermic: heat is lost by the system
B.endothermic: heat is gained by the system
C.endothermic: heat is lost by the system
D.exothermic: heat is gained by the system

Answer 1

Answer: The reaction
`SiO_(2)(g) + 3C(s) \rightarrow SiC(s) + 2CO(g); \Delta H = +624.7 kJ` is classified as endothermic: heat is gained by the system.

Step-by-step explanation:

A process or reaction in which heat is absorbed is called endothermic reaction.

For example, melting of ice is an endothermic process.

For an endothermic reaction the sign of
`\Delta H` is positive which means heat is gained by the system.

Here, the given reaction is as follows.

`SiO_(2)(g) + 3C(s) \rightarrow SiC(s) + 2CO(g); \Delta H = +624.7 kJ`

A process or reaction in which heat is released is called exothermic reaction.

For example, combustion reaction, freezing of water etc are exothermic process.

For an exothermic reaction the sign
`\Delta H` is negative which means heat is lost by the system.

Thus, we can conclude that the reaction
`SiO_(2)(g) + 3C(s) \rightarrow SiC(s) + 2CO(g); \Delta H = +624.7 kJ` is classified as endothermic: heat is gained by the system.