Writing Formulae of Ionic Compounds Worksheet

Flashcards based on the Chemistry Form 4 worksheet from Gaborone Senior Secondary School regarding the rules and specific formulae for writing ionic compounds.

Sodium chloride

An ionic compound with the chemical formula $NaCl$.

Magnesium ion charge

The electrical charge of a magnesium ion is $+2$.

Calcium oxide

An ionic compound with the chemical formula $CaO$.

Aluminium chloride

An ionic compound with the chemical formula $AlCl_3$.

Oxide ion charge

The electrical charge of an oxide ion is $2-$.

Magnesium nitride

An ionic compound with the chemical formula $Mg_3N_2$.

Potassium sulphate

An ionic compound with the chemical formula $K_2SO_4$.

Polyatomic ion

An ion composed of more than one atom, such as the carbonate ion in $CaCO_3$ or the ammonium ion in $NH_4Cl$.

Ammonium chloride

An ionic compound with the chemical formula $NH_4Cl$.

Calcium nitrate

An ionic compound with the chemical formula $Ca(NO_3)_2$.

Ionic Formula Rule

The rule stating that in an ionic compound, the total positive charge must equal the total negative charge.

Sodium oxide

An ionic compound with the chemical formula $Na_2O$.

Aluminium oxide

An ionic compound with the chemical formula $Al_2O_3$.

Aluminium sulphide

An ionic compound with the chemical formula $Al_2S_3$.

Sodium carbonate

An ionic compound with the chemical formula $Na_2CO_3$.

Ammonium sulfate

An ionic compound with the chemical formula $(NH_4)_2SO_4$.

Magnesium hydroxide

An ionic compound with the chemical formula $Mg(OH)_2$.

Ammonium phosphate

An ionic compound formed from $NH_4^+$ and $PO_4^{3-}$ ions with the formula $(NH_4)_3PO_4$.

Brackets in Formulae

Used in chemical formulas to indicate that there is more than one of a specific polyatomic ion, such as the two nitrate ions in $Ca(NO_3)_2$.

Magnesium Oxide Simplification

The formula is written as $MgO$ instead of $Mg_2O_2$ because ionic formulas should reflect the simplest whole-number ratio of ions.

Calcium phosphate

An ionic compound formed from $Ca^{2+}$ and $PO_4^{3-}$ ions with the formula $Ca_3(PO_4)_2$.

Iron(III) chloride

An ionic compound with the chemical formula $FeCl_3$.

Copper(II) sulfate

An ionic compound with the chemical formula $CuSO_4$.

Monatomic ion

An ion consisting of only a single atom.