mid year science review

Chemistry , earth history , infectious disease

Chemistry Unit

Groups and Periods

Groups are the the columns on the periodic table that goes up and down / vertical .

Periods are horizontal rows on the periodic table .

Law of conversation of matter

The law of conservation of mass states that matter cannot be created or destroyed it can only be transferred from state to state .
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Elements , compounds , mixtures

Compounds - two or more atoms combined Mixture -