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Suppose you have a crystal composed of the elements X and Y in which the radius ratio is approximately 1/2 so that the sodium chloride lattice is possible. Each ion is about the same size as Na^+ and Cl^-, respectively, but each is doubly charged, X^2+ and Y^2-. Would solid XY have a higher or lower melting point than solid NaCl? _____ The compound _____ meets these criteria and has a melting point of _____ Suppose you have a crystal composed of the elements A and B in which each ion has a charge of one, A^+ and B^-, like Na and Cl^-, but where the radii of A^+ and B^- are proportionally larger, but still approximately 1/2. Would solid AB have a higher or lower melting point than solid NaCl? _____ The compound _____ meets these criteria and has a melting point of _____
Expert Answer
Answer
4) XY has higher meltinig point than NaCl
The Compound CaS meets these criteria and has melting point of 2400 degree centigrade ( greater then the melting point of NaCl – 800 degrees centigrade)
5) AB has lower melting point than NaCl
The compounf AgBr meets these criteria and has a melting point of 432 degree centigrade.
