The number of solutions of a quadratic equation Whiteboard exercise Play

The quadratic formula Class activity Play

The quadratic formula Whiteboard presentation Play

The reactions between some cations and hydroxide solutions Student activity Play

The reactions between some cations and hydroxide solutions Whiteboard exercise Play

The solutions of a quadratic equation Whiteboard exercise Play

Types of electrolytes Animation Play

Types of ion present in aqueous solutions Whiteboard exercise Play

Types of ion present in aqueous solutions Student activity Play

Types of salt Illustration Play

Water solutions of certain metal salts are acidic Animation Play

Water solutions of sulphuric acid and sulphurous acid Whiteboard exercise Play

What types of ions are found in aqueous solutions Animation Play

Why are water solutions of metal salts usually acidic? Animation Play

Why does zinc displace copper from solutions of copper salts? Animation Play

Why salts of strong acids and strong bases produce neutral solutions Animation Play

Why two acids or bases of equal concentrations may have different pHs Student activity Play