1) Which is correct considering the magnitude of lattice energy? a) AlCl 3 > AlB

Question

1) Which is correct considering the magnitude of lattice energy?

a) AlCl3 > AlBr3

b) CaCl2 > CaF2
c)RbI > RbCl

d) FeCl2 > FeCl3

2) In forming an ionic bond:

a) electrons are transferred from an atom with low ionization energy to an atom with high electron affinity.

b) electrons are transferred from an atom with low ionization energy to an atom with low electron affinity.

c) electrons are transferred from an atom with high ionization energy to an atom with high electron affinity.

d) electrons are transferred from an atom with high ionization energy to an atom with low electron affinity.

I answered all the questions but really don't know the answer for these two :-/

Explanation / Answer

(1) The answer is:

(a) AlCl3 > AlBr3


Since Cl- is smaller than Br- and both have -1 charge

=> charge density (= charge/size) of Cl- is larger than Br-

=> electrostatic attraction for Al3+ is greater for Cl-

=> AlCl3 has larger lattice energy than AlBr3


(2) The answer is:

a) electrons are transferred from an atom with low ionization energy to an atom with high electron affinity.


When ionic bonds form:

An atom needs to lose electrons to become cation => low ionization energy required

An atom needs to gain electrons to become anion => high electron affinity required

Related Questions

Navigate

• Browse (All)
• Browse 1
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.