Question

Which of the following is not a correct ionic formula unit?
Select one:
a. BaO
b. Ca3N2
c. KCl
d. LiS2

Answer 1

Is this just checking if the oxidation state is correct, like K is +1 and Cl is -1
Formula unit for potassium chloride
KCl

Answer 2

idk man, that's the whole question

Answer 3

What is the charge of a Lithium ion?

Answer 4

What is the charge of sulfur ion?

Answer 5

idk?

Answer 6

Lithium is in group 1, it has +1 charge
Sulfur is in the group 7, it has -2 chage

to form a group with these 2, the charges must balance, you need 2 lithiums and 1 sulfur

Answer 7

\[2Li ^{+1} +S ^{-1} --> Li _{2}S\]

Answer 8

They wrote \[LiS _{2}\] not right

Answer 9

Need to learn the oxidation states for common ions, that is the point of this i think

Answer 10

like Ba is +2 and O is -2, you need one of each atom

BaO the charges are neutral

Answer 11

Ca is +2
N is -3

You need 3 Ca +6 and 2 N -6 to balance the charges

\[Ca _{3}N _{2}\]

Answer 12

K +1
Cl -1
-------
1 of each to balance the charges

KCl

Answer 13

so lis2 is the anwser because all the others are correct and add up?

Answer 14

Right, Lithium is +1, Sulfur is -2, to make a neutral formula unit, you need 2 Lithium and 1 Sulfur

Li2S

Answer 15

thanks!

Answer 16

Do you have another you want to try while i am here?