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Energy & Changes

Unit 4: Energy & Chemical Changes

TermDefinition
chemical change A change in matter where the original substances turn into new substances with different properties. Burning, rusting, cooking.
combustion A chemical reaction between substances, usually including oxygen accompanied by giving off heat.
conduction Movement of heat through matter. The transfer of heat by touching two things together (Direct contact).
convection Transfer of heat by the movement of fluids (liquids or gases). Hot fluid rises, while cold fluid sinks.
endothermic Chemical changes that absorb energy and become cooler. More energy is required to break the bond.
exothermic A chemical change that may produce heat energy, (heat exits).
physical change Changes in matter where the chemical composition is not changed. Cutting, ripping, mixing.
precipitate A solid that forms and sinks to the bottom of a liquid after a chemical reaction.
radiation Transfer of heat or energy transmitted in waves. Sunlight, microwave, bonfire.
specific heat The amount of heat needed to raise the temperature of 1 gram of a substance by 1 degree Celsius
thermal energy Energy generated by a source and measured by heat.
Created by: MrsBurton2024
 

 



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