CHEM 1201 Chapter : Chapter 3
Document Summary
Read the + sign as reacts with and the arrow as produces. Reactants substances to the left of the arrow or starting substances . Products chemical formula to the right of the arrow represent substances produced from the reaction. Coefficients indicate the relative numbers of molecules of each kind involved in the reaction (coefficient 1 is not written, just assumed) Equations must have an equal number of atoms on both sides of the equation = balanced the number of atoms is obtained by multiplying each subscript in a chemical formula by the coefficient for the formula. For most purposes, a balanced equation should contain the smallest possible whole- number coefficients. *never change subscripts when balancing an equation placing a coefficient in front of a formula changes the amount of the substance and not its identity. Use symbols (g), (l), (s), and (aq) for substances that are gases, liquids, solids, and dissolved in aqueous (water) solution, respectively.
