Population and sample Student activity Play

Population variance Student activity Play

Potassium manganate(VII) and potassium dichromate(VI) in redox titrations Student activity Play

Preparing a standard solution Animation Play

Preparing solutions of given concentrations Student activity Play

Proteins – sample foods Slideshow Play

Pumping an (inner) tube Whiteboard exercise Play

Radiation and a charge Animation Play

Radioactive decay Whiteboard exercise Play

Radioactive decay Student activity Play

Radioactive decay of Krypton-91 Whiteboard exercise Play

Random sampling Whiteboard exercise Play

Random sampling using a calculator Student activity Play

Reaction of potassium manganate(VII) with hydrogen peroxide Animation Play

Reactions between Period 3 elements and water Whiteboard exercise Play

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

Roentgen's experiment Animation Play

Root hair Whiteboard exercise Play

Root hairs Student activity Play

Roots Student activity Play

Sample antagonistic muscle pair Simulation Play

Sample compounds Slideshow Play

Sample endocrine glands Simulation Play

Sample food chains Illustration Play

Sample foods and nutritional components Whiteboard exercise Play