Pyramids Student activity Play

Pythagorean theorem in 3-dimensional space Student activity Play

Radio waves Student activity Play

Radioactive decay Student activity Play

Radioactivity Student activity Play

Radioactivity Animation Play

Radioactivity – time relationship Illustration Play

Rate of change on the straight line Student activity Play

Rate of radioactive decay Animation Play

Ratio of two quantities of different kinds Student activity Play

Ratio of two quantities of different kinds Whiteboard exercise Play

Reaction of ammonia with water Animation Play

Reaction of ethanoic acid with water Animation Play

Reaction of metal ions with alkalis Student activity Play

Reaction with sodium hydroxide Animation Play

Reactions between Group 1 and 2 metals and water Student activity Play

Reactions of acids and bases Whiteboard presentation Play

Reactions of acids and bases Class activity Play

Reactions of amides Student activity Play

Reading from graphs Student activity Play

Reading the graph Student activity Play

Rectilinear motion and circular motion Animation Play

Relationship between air resistance and speed Student activity Play

Relationship between air resistance and speed Whiteboard exercise Play

Relationship between distance and time Animation Play