AP Chemistrymediummcq1 pt
Which solid should have the highest melting point?
A.NaCl, held together by strong ionic attractions
B.Cu, held together by metallic bonding
C.SiO2, a network covalent solid
D.CO2, whose polar C=O bonds attract strongly
Explanation
Core Concept
Melting temperature reports how much energy is needed to pull a solid apart. Quartz is a network covalent solid: silicon-oxygen covalent bonds link every atom into one continuous framework, so melting means breaking true chemical bonds throughout the crystal, requiring temperatures near 1700 degrees Celsius. Sodium chloride melts near 800 degrees because only electrostatic ion attractions must be overcome, copper near 1085 degrees with its metallic bonding, and CO2 separates into free molecules far below room temperature using nothing but weak dispersion forces.
Correct Answer
CSiO2, a network covalent solid
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