Chemical Interactions

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Presentation transcript:

Chemical Interactions Unit 1 Chemical Interactions

Particles in Motion What is kinetic energy? Moving objects, like particles, have energy Movement energy is called kinetic energy The amount of kinetic energy an object has depends on its mass and the speed it is moving

Changing Kinetic Energy When particles speed up kinetic energy increases Particles in substances move faster when they are heated Heat increases kinetic energy

What happens when gases heat up? Heated gas particles move faster and bump against each other so they have greater kinetic energy Heated gas expands

What happens when liquids heat up? Heated liquid particles move faster and have greater kinetic energy Heated liquid expands

What happens when solids heat up? Heated solid particles vibrate faster and have greater kinetic energy Heated solid expands

What happens when particles cool? When particles of matter are cooled they move slower and have less kinetic energy Cooled matter contracts http://www.fossweb.com/delegate/ssi-wdf-ucm-webContent/Contribution%20Folders/FOSS/multimedia_ms_1E/ChemicalInteractions/molecules/particles.html