Summary AQA A level chemistry- All Chemical equations

Chemical equations:
Group 2:

M2+ + 2 H2O ⟶ M(OH)2 + H2

SO42– + Ba2+ ⟶ BaSO4

CaCO3 + ½ O2 + SO2⟶ CaSO4 + CO2
CaO + 2 H2O + SO2 + ½ O2 ⟶ CaSO4ᐧ2 H2O

Group 7: (see above for tests)

NaCl + H2SO4 ⟶ NaHSO4 + HCl

2 NaBr + 2 H2SO4 ⟶ SO2 + Na2SO4 + Br2 + 2 H2O

8 H+ + 8 I– + H2SO4 ⟶ H2S + 4 H2O + 4 I2

Cl2 + H2O ⇌ HCl + HClO

NaClO + H2O ⇌ Na+ + OH– + HClO

2 Cl2 + 2 H2O ⇌ 4 HCl + O2




Period 3 Oxides:
Element Formation Observation Equation with pH of Melting point
(Ascending Equation water aqueous order and
order of solution structure
Electroneg
ativity)

Na 4Na (s) + O2 (g) Orange Na2O + H2O ⟶ 13 4th (Giant ionic)
⟶ 2Na2O (s) flame 2 NaOH
White solid

Mg 2Mg (s) + O2 White flame MgO + H2O ⟶ 8 1st (Giant ionic)