chem

[BodybldgDoc]

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Which of the following compounds consistently have the highest melting points?
A.dipoles
B.alkanes
C.molecular crystals
D.salts
E.metals

what do you think guys?

 

[REH]

I'm going to go with E.metals

 

[Awuah29]

E is the right answer

 

[sickeye29]

why cant the answer be D- salts, i thought salts generaly have the highest Bp and Mp

 

[Lonely Sol]

why cant the answer be D- salts, i thought salts generaly have the highest Bp and Mp

but compare to metals, its no match!!!

 

[BodybldgDoc]

The answer at the back says D. I too first picked E as the answer. But I'm not sure whether its D or E. This problem is from the barrons practice test.

 

[Lonely Sol]

Yea, I guess i was wrong, it must be salt because when you think about it, salt is formed by joining a metal and a non-metal (ionic bond), and if you arrange many particles together, it forms a crystal lattice, which gives the compound a great deal of stability. Crystal lattice stability also accounts for its high melting point.

See if the question only said, which one has high melting point then it could be either metal or salt, depending upon the compound, for example, NaCl has m.p of 808° C while Titanium is about 1600° C. But the question said which one is consistently have highest melting point, then its an ionic bond, which is salts.

 

[BodybldgDoc]

Yea, I guess i was wrong, it must be salt because when you think about it, salt is formed by joining a metal and a non-metal (ionic bond), and if you arrange many particles together, it forms a crystal lattice, which gives the compound a great deal of stability. Crystal lattice stability also accounts for its high melting point.

See if the question only said, which one has high melting point then it could be either metal or salt, depending upon the compound, for example, NaCl has m.p of 808° C while Titanium is about 1600° C. But the question said which one is consistently have highest melting point, then its an ionic bond, which is salts.

You are right Lonely Sol. thanks for the explanation.