State the formulae of the elements and compounds named in the subject content

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IGCSE Chemistry - Stoichiometry - Formulae

IGCSE Chemistry 0620 - Stoichiometry - Formulae

Objective

State the formulae of the elements and compounds named in the subject content.

Elements

The following are the formulae of the elements encountered in the IGCSE Chemistry syllabus:

Hydrogen: $H_2$
Carbon: C
Oxygen: $O_2$
Nitrogen: $N_2$
Sodium: $Na$
Magnesium: $Mg$
Aluminium: $Al$
Silicon: $Si$
Phosphorus: $P$
Sulfur: $S$
Chlorine: $Cl$
Potassium: $K$
Calcium: $Ca$
Iron: $Fe$
Copper: $Cu$
Zinc: $Zn$
Bromine: $Br$
Iodine: $I$

Common Compounds

The following are the formulae of common compounds encountered in the IGCSE Chemistry syllabus:

Compound Name	Formulae
Water	$H_2O$
Carbon Dioxide	$CO_2$
Carbon Monoxide	$CO$
Ammonia	$NH_3$
Nitric Acid	$HNO_3$
Sulfuric Acid	$H_2SO_4$
Hydrochloric Acid	$HCl$
Sodium Chloride	$NaCl$
Magnesium Oxide	$MgO$
Calcium Carbonate	$CaCO_3$
Sodium Hydroxide	$NaOH$
Potassium Hydroxide	$KOH$
Calcium Oxide	$CaO$
Sodium Sulphate	$Na_2SO_4$
Copper(II) Oxide	$CuO$
Iron(II) Chloride	$FeCl_2$
Iron(III) Oxide	$Fe_2O_3$
Zinc Oxide	$ZnO$
Silver Nitrate	$AgNO_3$

Note: It is crucial to memorize these formulae for successful problem-solving in stoichiometry. Pay attention to the valency of elements when determining the correct formulae.