Homework Help: Chemistry (please check)

Posted by Abi on Friday, April 15, 2011 at 11:18pm.

1)Which of the following compounds has the largest lattice energy:
LiF
LiCl
NaF
NaCl

2)Which of the following compounds has the most ionic character in its bonding:
CaBr2
GeBr4
KBr
GaBr3

3)Using the electronegativity table on page 364 of your text, which end of the B-N bond is negative?
B
N
neither
both

4)The O-H bond in a water molecule is:
nonpolar covalent
ionic
polar covalent
ionic covalent

My answers are:
1)LiF
2)KBr
3)N
4)polar covalent

I just want to be completely sure of these answers before submitting them, since I just get one opportunity to do so. If someone could check this, it would be deeply appreciated. Also, if something is wrong, please explain... Thanks

Chemistry (please check) - DrBob222, Saturday, April 16, 2011 at 1:47pm
#1 is a little confusing with the use of the word largest. I think it is common practice to list LiF as the largest lattice energy but technically it is the smallest number.
Lattice energies are as follows:
LiF = -1036 kJ/mol
NaF = -923 kJ/mol
LiCl = -853 kJ/mol
NaCl = -787 kJ/mol
Therefore, I think you answer to #1 is ok but do keep the negative in mind.

2, 3, and 4 look ok to me.

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