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Matter and Energy
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Matter and Energy Elements- smallest thing matter can be broken down into. Chemical rxn: NaCl > Na + Cl (decomposition reaction) Each element has a unique symbol 90 elements exist in nature Compound- combination if 2 or more elements A particular compound will always combine in the same mass ratio Water reaction in a 1: 8 ratio ***** know elements 1-36 mixture- combination of elements and/or compounds elements and compounds are pure substances Types of mixtures: Homogeneous- same ratio throughout. Example. Milk Requires physical change to separate Heterogeneous- opposite. Example chocolate chip cookie, pepperoni pizza Reactants: - put in sealed vessel } Law of Conservation - after rxn they are the same weight } of Mass In a given chemical compound the elements combine in the same proportion by mass Atomic Theory (John Dalton) 1.
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Paper Information
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Title: Matter and Energy
Words: 633
Rating: None
Pages: 2.5
submitted by: blkcece
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