10-05-10 - Lecture 4 - Chapter3

10-05-10 - Lecture 4 - Chapter3 - LawofConservationofMass...

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Law of Conservation of Mass Because the same atoms are present in a reaction at the beginning and at the end, the amount of mass in a system does not change. chemical equations must be balanced they must have the same number of atoms of the same kind of atom on both sides stoichiometric coefficients 2 H 2 (g) + O 2 (g) → 2 H 2 O (g)
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Meaning of Chemical Equations 4 Al (s) + 3 O 2 (g) → 2 Al 2 O 3 (s) This equation means: 4 Al atoms + 3 O 2 molecules give 2 units of Al 2 O 3 BUT it also means: 4 moles of Al + 3 moles of O 2 give
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Chemical Equations To write a chemical reaction, you need to know: 1. All the reactants and their formulas 2. All the products and their formulas 3. The states of the reactants and products (g) for gas, (l) for liquid, (s) for solid, (aq) for aqueous (water) solution 1. Is there a catalyst involved? Or is a high temperature required? 2. Stoichiometric coefficients identifying the
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This note was uploaded on 01/05/2011 for the course CHEM 6A taught by Professor Pomeroy during the Fall '08 term at UCSD.

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10-05-10 - Lecture 4 - Chapter3 - LawofConservationofMass...

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