Endothermic

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• Absorption of heat
• Taking heat in

Exothermic

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• Release of heat

Mass

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http://hyperphysics.phy-astr.gsu.edu/hbase/mass.html

• A quantity of matter forming a body of indefinite shape and size, usually of relatively large size; lump
• Mass is not the same as weight

Law of Conservation of Mass

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• States that in any closed system the amount of mass will remain constant over time
• This means that matter can neither be created nor destroyed
• In a chemical reaction, the mass of the reactants you start with will equal the mass of the products once the reaction is complete
• Even when matter is transformed, the mass will remain constant

Chemical Formula

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• An expression which states the number and type of atoms present in a molecule of a substance.
• A representation of a substance using symbols for its constituent elements

Reactant

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• A substance that participates in a chemicalreaction 
• A substance that is present at the start of thereaction

Product

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• A substance obtained from another substance through chemical change

Coefficient

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http://balancingequations.info/Images/coefficient-subscript.jpg

• A number placed in front of a symbol or a formula in a chemical equation

Subscript

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• A distinguishing character or symbol written directly  beneath or next to and slightly below a letter or number
• Written below

Atom

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• The smallest component of an element having the chemical properties of the element
• Consisting of a nucleus containing combinations of neutrons and protons and one or more electrons bound to the nucleus by electrical attraction
• The number of protons determines the identity of the element.

Molecule

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• The smallest physical unit of an element or compound, consisting of one or more like atoms in an element and two or more different atoms in a compound

Periodic Table

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• A table of the elements, arranged in order of increasing atomic number, based on the periodic law
• Elements having similar chemical properties and electronic structures appear in vertical columns (groups)