Credit: RHYS LEWIS, AHS, DECD, UNISA/SCIENCE PHOTO LIBRARY

Caption: Reaction forming hydrogen chloride. Animation showing the reaction between a mixture of molecules of the diatomic gas hydrogen (H2, grey) and the diatomic gas chlorine (Cl2, green) to form molecules of hydrogen chloride (HCl). Labels added to the animation highlight the reactants and product. The breaking and formation of the molecular bonds is also shown, with two molecules of hydrogen chloride forming from the reaction between a molecule of hydrogen and a molecule of chlorine. This is an example of the collision theory of chemical reactions. For the same reaction, with an explanation of activation energy, see clip K005/4857.

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