Elements Of Life

Elements of Life 11/09/08 Ions we should know: OH ⁻ Hydroxide NO₃⁻ Nitrate HN₄⁺ Ammonium SO₄ ²⁻ Sulphate CO₃²⁻ Carbonate Compounds we should know: HCl- Hydrochloric Acid H₂SO₄ -Sulphuric Acid HNO₃ -Nitric Acid NaOH- Sodium Hydroxide NH₃ -Ammonia Positive and negative charges need to balance each other out. E.g. Potassium Bromide K⁺ Br⁻ =KBr Lead²⁺ Sulphate Pb²⁺ SO₄²⁻ =PbSO₄ Copper⁺ Oxide Cu⁺ O²⁻ =Cu₂O Sodium Carbonate Na⁺ C⁴⁻ =Na₄C Balancing Equations Na₂SO₄ + MgCl₂ 2NACl + MgSO₄ All elements need to be equal on both sides. 4 Oxygen on the left means you need 4 Oxygen on the right. Elements that hang around in pairs when on their own are: All of group 7: F₂, Cl₂, Br₂, I₂, At₂ Also H₂, N₂, O₂