The action of T lymphocytes Animation Play

The action of the immune system against bacterial infections Slideshow Play

The action of wind and water Animation Play

The action spectrum of photosynthesis Illustration Play

The actions of antibiotics and their significance in medicine Whiteboard exercise Play

The addition of hydrogen to alkenes Animation Play

The antagonistic actions of glucagon and insulin Illustration Play

The causes and control of plant diseases Slideshow Play

The effect of water hardness on the cleansing action of soap and detergents Slideshow Play

The energy changes during the course of a chemical reaction Animation Play

The First and the Third Law of Motion Class activity Play

The First and the Third Law of Motion Whiteboard presentation Play

The force of reaction Class activity Play

The force of reaction Whiteboard presentation Play

The forces are identical in magnitude Animation Play

The Friedel–Crafts alkylation Animation Play

The heart and physical effort Slideshow Play

The hydrogenation of alkenes or alkynes Animation Play

The mechanism of catalyst action Animation Play

The methods of cracking Animation Play

The same magnitude Student activity Play

The same magnitude Whiteboard exercise Play

The synthesis of magnesium iodide Animation Play

The Third Law of Motion Student activity Play

The Third Law of Motion Whiteboard exercise Play