System
materials involved in the chemical reaction
Surrounding
everyrhing else in the universe
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System
materials involved in the chemical reaction
Surrounding
everyrhing else in the universe
Open-System
both matter and energy can freely cross from the system to the surrounding and back again
Closed-System
energy can cross the boundary but matter cannot
Isolated -System
neither matter nor energy can cross between the system and the surroundings
Physical Change
molecules may be rearranged but no new substance is produced (eg. cutting, texture, shape, dissolving in water, changes in state)
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)
Endothermic reaction
When more energy is absorbed by the system than is released into the surroundings (eg. melting ice, photosynthesis)
Exothermic Reaction
When more energy is released into the surrounding than is absorbed by the system (eg. combustion, solidification, bond making)
Rate or Reaction
The speed of reaction