A) Which of the following is expected to have the largest lattice energy CaS or

Question

A) Which of the following is expected to have the largest lattice energy CaS or K20? and is it due to the size or number of ions, or the magnitude of the charges?

B) identify if it belongs to an ionic or covalent compound or both.
a. large difference in electronegativity between atoms_______
b. melting point at 834°C______
c. does not conduct electricity when melted______
d. does not conduct electricity as a solid_____

C) what are the values of the quantum numbers for one of the valence electrons in Sr?
a. n=_____
b. l=______
c. ml=_____
d. ms=_______

D) Determine the delta Hrxn for the following reaction: CCl4 (g)+ F2 (g)CF4 (g)+Cl2 (g)
bonds:          energy:
C-Cl                328
F-F                  155
C-F                  485
Cl-Cl                242

Explanation / Answer

a)

  The lattice energy depends on the size and charge of the ions. The smaller they are and the higher their charge the stronger the lattice energy.

between CaS and K2O, K and Ca have nearly comparable sizes, but Ca have +2 charge in comparison to +1 charge of K.

so CaS have higher lattice energy.

B)

a) ionic

b) ionic compounds have high melting point

c) covalent

d) both

C)

valence orbital is 5s.

so, n=5, l=o, ml=0, ms= +1/2

D)

delta H reaction= Eproduct - Ereactant.

Ereactants: 4x328 + 2x155= 1622

Eproduct: 4x485 + 2x242 = 2424

delta H reation= 802.

You havent given the units of energies of bonds. So whatever the units the bond energy have, delta H have the same

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