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...Main ideas physical and chemical properties can be used to identify substances how i distinguish between e shape density solubility odor melting point boiling color acidity basicity combustibility reactivity determine the identity of an unknown substance by comparing its those known compare changes including in size state that are result reactions or temperature formation a precipitate gas matter undergo composition does not change different formed students know when is broken apart combined at least one new reaction has occurred differentiate observed measured without changing kind being studied following help...