Rates of water evaporation Slideshow Play

Ratio and proportion Class activity Play

Ratio and proportion Whiteboard presentation Play

Reactants' concentration and the reaction rate Animation Play

Reaction rate Class activity Play

Reaction rate Class activity Play

Reaction rate Whiteboard presentation Play

Reaction rate Whiteboard presentation Play

Reaction rate Student activity Play

Regulation of growth hormone secretion Slideshow Play

Regulation of heart rate by the nervous and endocrine systems Slideshow Play

Relative velocity vectors Student activity Play

Relative velocity vectors Whiteboard exercise Play

Repeated percentage change Class activity Play

Repeated percentage change Whiteboard presentation Play

Reproduction rate (fecundity) Whiteboard exercise Play

Reproduction rate (fecundity) Student activity Play

Respiration Student activity Play

Roasting turkey Animation Play

Role of adrenaline Slideshow Play

Role of growth hormone Slideshow Play

Second-order reaction Animation Play

Second-order reactions Student activity Play

Seed germination and plant growth Class activity Play

Seed germination and plant growth Whiteboard presentation Play