Matter And
Matter And
Energy
Energy
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Chemical Reactions and Energy
•
All chemical changes are accompanied by a
change in energy
•
Energy
is either absorbed or released as the
chemical change takes place.
Energy is the
ability to do work.
Chemical Reactions and Energy
•
Energy is primarily released in the forms of
heat and/or light
•
Chemical reactions that release heat energy
are called
exothermic
reactions.
•
Chemical reactions that absorb heat energy
are called
endothermic
reactions.
Fundamental Chemical Laws—Law
of Conservation of Mass
•
The Law of Conservation of mass says that in
a chemical change, matter is neither created
nor destroyed. It would be equally correct to
call this the law of conservation of matter.
