Multiplying linear expressions – mental method Student activity Play

Multiplying linear expressions – method I Student activity Play

Multiplying linear expressions – method II Student activity Play

Multiplying natural numbers Animation Play

Multiplying natural numbers using the written method Student activity Play

Multiplying natural numbers using the written method Whiteboard exercise Play

Names and chemical symbols of isotopes Animation Play

Names and symbols of elements Animation Play

Natural and artificial methods of contraception Slideshow Play

Nervous and chemical regulation of respiratory movements Student activity Play

Neutralising acid Simulation Play

New methods of controlling plant diseases Illustration Play

Newton's method Animation Play

Newton's method Student activity Play

Newton's method step by step Animation Play

Non-polar molecules Animation Play

Non-stoichiometric ratio of quantities of reactants Student activity Play

Not all collisions are effective Whiteboard exercise Play

Not all collisions are effective Student activity Play

Not all reactions involve collisions Student activity Play

Numerical integration – Simpson's rule Class activity Play

Numerical integration – Simpson's rule Whiteboard presentation Play

Observation of the temperature changes of the system during a chemical reaction Animation Play

One-number representation of data Student activity Play

Other nastic movements – chemonasty and seismonasty Student activity Play