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physical properties

properties that don't involve changes in composition


physical state of a substance depends on this


substance that changes to a gas easily at room temperature


amount of matter contained in a unit of volume

chemical properties

properties that can be observed only when there is a change in the composition of a substance


a substance's tendency to break down into different substances

law of conservation of mass

states that in a chemical change matter is neither created nor destroyed


the capacity to do work

exothermic reactions

chemical reactions that give off heat energy

endothermic reactions

chemical reactions that absorb heat energy

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