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Unit 3
Physical and Chemical Changes Notes
Term | Definition |
---|---|
physical change | a change that affects one or more physical properties of a substance. |
chemical change | occurs when one or more substances change into entirely new substances with different properties. |
chemical properties | describe which chemical changes can or cannot happen to that substance. |
law of conservation of mass | states that in ordinary chemical and physical changes, mass is not created or destroyed. |
law of conservation of energy | states that energy cannot be created or destroyed. |
endothermic | changes that absorb energy. |
exothermic | changes that release energy. |