Endothermic and Exothermic Reactions

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System

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materials involved in the chemical reaction

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Surrounding

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everyrhing else in the universe

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10 Terms

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System

materials involved in the chemical reaction

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Surrounding

everyrhing else in the universe

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Open-System

both matter and energy can freely cross from the system to the surrounding and back again

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Closed-System

energy can cross the boundary but matter cannot

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Isolated -System

neither matter nor energy can cross between the system and the surroundings

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Physical Change

molecules may be rearranged but no new substance is produced (eg. cutting, texture, shape, dissolving in water, changes in state)

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Chemical Change

A change in matter that produces one or more new substances (eg. gas is produced, light is given off, change in temp, etc)

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Endothermic reaction

When more energy is absorbed by the system than is released into the surroundings (eg. melting ice, photosynthesis)

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Exothermic Reaction

When more energy is released into the surrounding than is absorbed by the system (eg. combustion, solidification, bond making)

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Rate or Reaction

The speed of reaction