Question

5. The table below gives formulas for some ionic compounds formed when cations (X, Y, Z) combine with anions (A, L, D, F).

a. What are the charges for each cation and anion (4 points)
b. Write formulas for compounds 1-4 (2 points)

Answer 1

cation - ( x, y ,z)

Anion - ( A,L, D,F )

consider : P+m - cation

Q^n- : Anion

(1) x + A : xa^2

x^2, A- —> xa2

x + L : XL , x^2 + L^2- —> XL

x + D : (1) x + f = XF : x^2 + F^2-

(2) Y + A = (2) Y + L : Y2L : ( Y+, L^-2 —> Y2L )

Y + D : Y3D : Y+, D3- : Y3d

Y+ F : Y^+ + F^-2 = Y2F (3)

(4)

Z + A : z^3+ + A- —> ZA3 (Z+L= 4)

Z + D : ZD : Z ^+3, D^3- —> ZD

Z + F : Z2f3 : Z^3+ + F^2- —-> Z3F2

*

X^2, y^+1, Z^+3 - cation

A^-1, L^-2, D^-3, F^-2 : Anion

part B

1 : x^2 + D^3- = X3D2

2 : Y+ A : Y^+ + A - = YA

3 : Y + F : Y^+ + F^2- = YF2

4 : Z+ L = z^3 + L^2- = Z2L3