Here's why:
* Silicon chloride (SiCl4) is highly reactive with water: When exposed to air, SiCl4 reacts vigorously with water vapor present in the atmosphere. This reaction produces hydrochloric acid (HCl) and silicon dioxide (SiO2), which are both highly corrosive and volatile. The HCl gas is responsible for the steamy fumes you observe.
* The reaction:
SiCl4(l) + 2 H2O(g) → SiO2(s) + 4 HCl(g)
* Carbon is relatively inert: Carbon is much less reactive than silicon chloride. It does not readily react with water or moisture in the air. Therefore, it does not produce any visible fumes.
In summary: Silicon chloride is highly reactive with moisture and produces hydrochloric acid gas, causing the steamy fumes. Carbon, on the other hand, is relatively inert and does not react with moisture, resulting in no visible fumes.
