Solving the inequalities using the test-point method Student activity Play

Spontaneous chemical modifications of nitrogenous bases Slideshow Play

Sridhara's method of finding the roots of a quadratic equation Whiteboard exercise Play

Sridhara's method of finding the roots of a quadratic equation Student activity Play

Staining by Gram's method Animation Play

Standard entropy values Animation Play

State of chemical equilibrium Animation Play

Statements about chemical reactions Whiteboard exercise Play

Statements about least useful chemical reactions Whiteboard exercise Play

Statements about the importance of chemical reactions Whiteboard exercise Play

Statements about types of chemical reactions Whiteboard exercise Play

Static equilibrium and dynamic equilibrium Audio text Play

Statistical problem specification Student activity Play

Statistics – diagram Simulation Play

Structural and molecular formulae of chemical compounds Animation Play

Structure determination by chemical methods: an example Animation Play

Subtracting decimals using the written method Whiteboard exercise Play

Subtracting decimals using the written method Student activity Play

Subtracting natural numbers using the written method Student activity Play

Subtracting using the written method Animation Play

Subtracting using the written method Animation Play

Sundew – an insectivorous plant Animation Play

Symbols and formulae in chemical reactions Animation Play

Systematic sampling Student activity Play

Temperature dependence of reaction rates Student activity Play