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

Caption: Activation energy in chemical reactions. Animation showing the importance of bond energies and activation energies in a chemical reaction. This is an example of the collision theory of chemical reactions. The animation shows the reaction between the diatomic gas hydrogen (H2, grey) and the diatomic gas chlorine (Cl2, green) to form molecules of hydrogen chloride (HCl). The animation starts by zooming in to show the bond energy of 432 kilojoules per mole (kJ/mol) for a hydrogen molecule and the bond energy of 240 kJ/mol for a chlorine molecule. These bond energies combined are the activation energy of 672 kJ/mol for this reaction. The animation then shows a collision with an energy below the activation energy, and hence no reaction occurring. The animation then shows ultraviolet light (UV photons, purple) raising the energy of the gas molecules. This raises the collision energy above the activation energy, and the reaction is shown taking place. The final part of the animation shows a bond energy of 428 kJ/mol for a hydrogen chloride molecule.

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Keywords: activation energy, animated, animation, bond breaking, bond energy, bond formation, bonds, chemical, chemistry, chlorine, cl2, colliding, collision, collision theory, collisions, educational, energies, enthalpies, enthalpy, gas, gases, graphic, h2, hcl, hydrogen, hydrogen chloride, illustration, kinetic energy, molecular, molecule, molecules, no-one, nobody, physical chemistry, product, products, reactant, reactants, reacting, reaction, reaction kinetics, reactions, school science, ultraviolet light, uv photons, white background

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Activation energy in chemical reactions

K005/4857 Rights Managed

Downloadable master

Duration: 00:01:00.01

Frame size: 1920x1080

Frame rate: 24

Audio: No

Format: QuickTime, Photo JPEG 100%, progressive scan, square pixels

File size: 234.9M

Original

Capture format: QuickTime Animation

Codec: Animation

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