general chemistry concept on how to write chemical formulae

1. MRSM PC 1
2011 = form 4
How to write CHEMICAL FORMULA
Name …………………………………………………class…………………..teacher……
1) FORMULA OF ION
POSITIVE ION (ANION) AND NEGATIVE ION ( CATION)
Complete table below
Negative Formula in Positive ion Formula in
ion compound charge compound Charge
Oxide Sodium
Hydroxide Potassium
Nitrate NO3 -1 -1 Magnesium Mg 2+ +2
Sulphate Zinc
Carbonate Copper(II) Cu 2+ +2
Chloride Calsium
Bromide Silver
Iodide Ammonium
Chromate Aluminium
Stanum(II)
Dichromat
e
2) Write the chemical formula of compound
Example:
Chemical formula of Aluminium Carbonate
- State Aluminium ion and Carbonate ion
−2
Al 3+ CO3
balance the charge so need 2 aluminium ion and 3 carbonate ion
−2
2 Al 3+
3 CO3

2. 2
so the chemical formula is Al2( CO3)3
Complete the table below
Metal ion Oxide Hydroxide chloride
Sodium
Potassium
Calcium Ca(OH)2
Zinc
Aluminium
Metal ion Oxide Hydroxide chloride
Ferum(II)
Ferum(iii)
Copper(II)
Silver
Ammonium

3. 3
Metal ion Bromide Iodide sulphate Carbonate
Sodium
Potassium
Calcium
Zinc
Aluminium
Metal ion Bromide Iodide sulphate Carbonate
Ferum(II)
Ferum(III)
Copper(II)
Silver
Ammonium