7.64] An element X reacts with oxygen to form XO 2 and with chlo - rine to form

Question

7.64] An element X reacts with oxygen to form XO 2 and with chlo - rine to form XC l 4 . XO 2 is a white solid that melts at high tem- peratures (above 1 0 0 0 ° C ). Under usual conditions, XC l 4 is a colorless liquid with a boiling point of 5 8 ° C . ( a ) XC l 4 re - acts with water to form XO 2 and another product. What is the likely identity of the other product? ( b ) Do you think that element X is a metal, nonmetal, or metalloid? (c) By using a sourcebook such as the CRC Handbook of Chemistry and Physics, try to determine the identity of element X

Explanation / Answer

(a) The likely identity of the other compound is an acid, HCl

(b) The element X is a metalloid

(c) Identity of X would be Si (silicon)

reaction with O2,

SiCl4 + O2 ---> SiO2 + 2Cl2

SiO2 : melting point > 1000 oC

SiCl4 : boiling point : 58 oC

reaction with water,

SiCl4 + 2H2O --> SiO2 + 4HCl

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