# Reactivity of Silicon [closed]

$$\ce{SiO2 + 2C ->[2200°C] Si + 2CO}$$(Ref)

In this reaction, C is apparently displacing Si from SiO2. Does this mean C is more reactive than Si? But Si is more electropositive than C. What is the explanation for this? Where will Si be placed in the reactivity series?

• It depends. What temperature? – MaxW Jan 13 at 3:57
• @MaxW I made the changes – Shub Jan 13 at 4:00
• Reactivity is not a thing at all. Also, CO2 does not form in your reaction, nor does your reference say so. – Ivan Neretin Jan 13 at 6:10

Let's compare the boiling points of these substances. Silicon is boiling at $$2355°$$C. Carbon is boiling at $$4200°$$C. $$\ce{SiO2}$$ is boiling at $$2590°$$C. So at $$2200°$$C, $$\ce{CO}$$ is the only gaseous substance. Whatever the change of enthalpies or the electronegativities, its formation is favored.
$$\ce{2SiO_2 + SiC <-> 3SiO(g) + CO(g)}$$ $$\ce{SiO_2 + Si(l) <-> 2SiO(g)}$$ $$\ce{SiO(g) + SiC <-> Si(l) + CO(g)}$$ $$\ce{SiO(g) + 2C <-> SiC + CO(g)}$$
There is no reasonable answer to your question, because that reaction does not happen in a single step, it is not displacing anything. Though, the fact that you have to pour a spectacular number megawatts into the process for it to continue does suggest that $$\ce{Si}$$ is not "more reactive" though.