Dinitrogen tetroxide – nitrogen dioxide chemical equilibrium Animation Play

Discontinuous variation Student activity Play

Discontinuous variation - activity Whiteboard exercise Play

Discovering matter Student activity Play

Discovering matter Whiteboard exercise Play

Displacement of metals from solutions of their salts by other metals Student activity Play

Distinguish between a physical and a chemical change Whiteboard exercise Play

Distinguish between a physical and a chemical changes Whiteboard exercise Play

Does a chemical compound have a constant composition? Whiteboard exercise Play

Does a chemical compound have a constant composition? Student activity Play

Domain of the sum, difference, product and quotient of functions  f  and  g  – activity Whiteboard exercise Play

Drugs affecting the nervous system Slideshow Play

Dynamic state of chemical equilibrium Student activity Play

Dynamic state of chemical equilibrium Whiteboard exercise Play

Early attempts to classify chemical elements Whiteboard exercise Play

Early attempts to classify chemical elements Whiteboard exercise Play

Early attempts to classify chemical elements Student activity Play

Early attempts to classify chemical elements (1) Student activity Play

Early attempts to classify chemical elements (2) Student activity Play

Effect of a change in reactant concentration on the rate of a chemical reaction Animation Play

Effect of concentration on chemical equilibrium Simulation Play

Effect of concentration on chemical equilibrium Student activity Play

Effect of concentration on the rate of chemical reactions Simulation Play

Effect of concentration on the rate of chemical reactions Student activity Play

Effect of emotions and physical effort on the respiratory system Animation Play