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Chemistry 3&4

stoichiometry involves calculations based on chemical formulas and chemical equations
Law of conservation of mass is central to stoichiometry
atoms atoms are neither created nor destroyed in a chemical reaction. Atoms are simply rearranged to yield new substances
balancing chemical reactions formulas of reactants and products can't be changed
chemical equations balanced chemical reactions
physical state (g) gas (l) liquid (s) solid (aq) aqueous(water) solution
combustion reactions involve O2 as a reactant, typically form CO2 and H2O as products
relative atomic mass scale developed in a similar manner for all elements
O-16 atom mass 2.6560 * 10> -23 g
atomic mass unit (amu) the mass of one C-12 atom is assigned a value of 12 atomic mass units (amu), exactly
Avogadro's number 6.02*10>23
molar mass sum of the atomic mass of all atoms of the molecular formula of a molecular substance
percent composition of elements by mass divide the mass of each element in one mole of the compound by the molar mass of the compound, then multiply by 100 to get a percent
solution -homogeneous mixture of two or more substances - composed of a solvent with solutes dissolved
solvent substance that solutes are dissolved in
solute substances dissolved in the solvent to give a solution
solutes can be a gas, liquid, or solid
concentration amount of solute dissolved in a given quantity of solvent or solution
concentrate solution large amount of solute
dilute solution only a small amount of solute
quantitative description exact measurement of amount of the amount of solute in a given quantity of solvent or solution



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