Dissolution of substances in water Animation Play

Effect of substances dissolved in water Slideshow Play

Electrolytic dissociation (2) Student activity Play

Electronegativity and the nature of bonds (1) Student activity Play

Electrophiles as Lewis acids Animation Play

Electrophiles, nucleophiles and carbocations Student activity Play

Elements and non-elements – sorting substances Whiteboard exercise Play

Exchange of substances with the external environment Animation Play

Experiment on energy substances of the organism and cell respiration Simulation Play

Explosive substances Slideshow Play

Finding the polar coordinates of the points Animation Play

Flammability of organic substances Animation Play

Flammable substances Slideshow Play

Flow of substances in a plant Slideshow Play

Food – nutrients; stimulants and foreign substances Whiteboard exercise Play

Food – nutrients; stimulants and foreign substances Student activity Play

Foreign substances Slideshow Play

Harmful substances Slideshow Play

Hazardous substances Student activity Play

How plants obtain the substances necessary for life Slideshow Play

How to find the equation of a tangent from a point to a circle? Animation Play

Hydrogen atoms on oxygen or nitrogen are usually not coupled to their neighbours Animation Play

Hydrogen bond and dispersion forces Animation Play

Hydrogen bonding Student activity Play

Hydrogen bonding and boiling points Animation Play