Chemistry Lesson 9 Instructional Resource 1 - Matter And...

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.