CHEM 1210 Chapter Notes - Chapter 3: Chemical Formula, Relative Atomic Mass, Stoichiometry

• School: Ohio State University
• Department: Chemistry
• Course: CHEM 1210
• Professor: Kroner Steven

Document Summary

Law of conservation of mass: an equal amount of matter exists before and after a reaction. Products: right of arrow, substances produced by reaction. Must have same number of atoms of each element to be correctly balanced. Use abbreviations in subscript parentheses to indicate state (g)= gas (l)= liquid (s)= solid (aq)= aqueous. Combination reaction: 2 or more substances react to form a product. Decomposition reaction: 1 substance reacts to form two or more substances. Combustion reaction: rapid reaction that produces a flame with o2 as the reactant. Formula weight: sum of atomic weights of atoms in the chemical formula of a substance. Elemental composition: percent composition of individual elements in a substance. Percent composition: (number of atoms of element*atomic weight of element)/ (fw) Mole (mol): unit based on amount of matter that contains same amount of (cid:862)objects(cid:863) as 12 g of pure 12c atoms. Avogadro"s number: number of atoms in 12 g pure 12c.