Endothermic and Exothermic Reactions
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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