Democritus' and Dalton's atomic theories Student activity Play

Democritus's atomic theory Animation Play

Densities of straight-chain alkanes Illustration Play

Density Whiteboard presentation Play

Density Class activity Play

Density and the molecular structure of matter Student activity Play

Density of carbon dioxide Animation Play

Density of gases Student activity Play

Density of gases Whiteboard exercise Play

Depletion of the Earth's ozone layer Student activity Play

Depletion of the ozone layer Slideshow Play

Detecting carbon dioxide Animation Play

Detection of carbon dioxide Animation Play

Detection of carbon dioxide in air Slideshow Play

Determination of formulae of compounds Whiteboard exercise Play

Determination of molecular structure Student activity Play

Determining standard enthalpies of reaction Whiteboard exercise Play

Determining the composition of atomic nuclei Student activity Play

Determining the composition of atomic nuclei Whiteboard exercise Play

Determining the electron configuration of carbon Animation Play

Determining the electron configuration on the basis of the periodic table Student activity Play

Determining the empirical formula Animation Play

Determining the empirical formula Whiteboard exercise Play

Determining the empirical formula Student activity Play

Determining the molecular formula Animation Play