formula of ionic compounds

Question 1

what has to happen in an ionic compound?

Answer 1

the charges of the ions have to cancel out to leave an overall charge of zero

Question 2

In the ionic compounds sodium chloride

how have they cancelled it’s overall charge to zero?

Answer 2

Na+ and Cl-

= NaCl

Question 3

what is the formula for sodium oxide to cancel out the overall charge to zero?

Answer 3

Na+ and O-2
the charges have to cancel out the charge on one oxide ion
so we need 2 sodium ions now
Na x2 = Na2O

Question 4

calculate how to cancel the overall charge to zero of MAGNESIUM IODIDE
Mg2+ and I-

Answer 4

Mg2+ and (I- x2)
one magnesium and two Iodide
MgI2

Question 5

calculate how to cancel the overall charge to zero of LITHIUM CARBONATE
LI+ CO3 ^2-

Answer 5

Li2CO3

Question 6

calculate how to cancel the overall charge to zero of CALCIUM HYDROXIDE
CA2+ and OH-

Answer 6

Ca(OH)2

the brackets show that the hydroxide is being multiplied by 2 and not just the oxygen otherwise that would be incorrect

Question 7

calculate how to cancel the overall charge to zero of MAGNESIUM NITRATE
MG2+ and NO3^-

Answer 7

Mg(NO3)2