Rate of change in the natural logarithmic function Simulation Play

Rate of change on the straight line Student activity Play

Rate of change on the straight line Whiteboard exercise Play

Rates of change Whiteboard presentation Play

Rates of change Class activity Play

Ratio of two quantities of different kinds Student activity Play

Ratio of two quantities of different kinds Whiteboard exercise Play

Ratio of two quantities of the same kind Student activity Play

Ratio of two quantities of the same kind Simulation Play

Reaction conditions and enthalpy change Slideshow Play

Reaction of zinc metal with hydrochloric acid Animation Play

Reaction yields Student activity Play

Reactions between halogens and metals Student activity Play

Reactions between Period 3 elements and water Whiteboard exercise Play

Reactions between Period 3 elements and water (2) Student activity Play

Reactions involving phase changes Animation Play

Reactions occurring on the surface of a solid catalyst Student activity Play

Reactions of complex ions Student activity Play

Reading from graphs Student activity Play

Reading from graphs Whiteboard exercise Play

Real gases Student activity Play

Recent changes in the Earth's temperature Slideshow Play

Recognising reducing agents Simulation Play

Recognising reducing agents Student activity Play

Recombination in bacteria Animation Play