Questions about the physical changes Whiteboard exercise Play

Quicklime and slaked lime Student activity Play

Radiation of heat Student activity Play

Radio waves and microwaves Student activity Play

Radioactive waste disposal Slideshow Play

Radiocarbon dating Whiteboard exercise Play

Radiocarbon dating Student activity Play

Radiocarbon dating Simulation Play

Rate of change in the natural logarithmic function Simulation Play

Rate of change on the straight line Student activity Play

Rate of glomerular filtration and amount of ingested water Simulation Play

Rate of photosynthesis and water balance of a plant Slideshow Play

Rates of water evaporation Slideshow Play

Rational equations Whiteboard exercise Play

Reabsorption and tubular secretion Student activity Play

Reabsorption in the renal tubules Chart Play

Reabsorption of water in the proximal tubule Whiteboard exercise Play

Reabsorption of water in the proximal tubule Student activity Play

Reactants and products Whiteboard exercise Play

Reaction between alkenes and bromine water Animation Play

Reaction between copper and nitric(V) acid Animation Play

Reaction between metals and acids Student activity Play

Reaction conditions and enthalpy change Slideshow Play

Reaction course under changing environmental conditions Animation Play

Reaction of ammonia with hydrogen chloride Animation Play