Why Is Calcium Fluoride, Ca , a High Melting

question 80

Multiple Choice

Why is calcium fluoride, Ca , a high melting point crystalline solid while tin (IV) chloride, , is a volatile liquid?

• A) There is no theory to predict the physical property of melting point. Melting point temperatures are empirically determined.
• B) Actually, we would predict these results to be the opposite. Since each metal is combined with a group 17 halogen, the heavier metal (tin) combination should have the higher melting point.
• C) Ca is a small, linear, non-polar molecule, while is a huge tetrahedral structure. Therefore the bonds in calcium fluoride tend to give it a higher melting point temperature.
• D) Ionic compounds formed by elements on opposite sides of the periodic table, like , tend to have higher melting points than more covalently bonded structures, like .

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