Balancing & Word Equations

Phase symbols

• are subscripts that indicate the phase of the chemical
• Al(s), H2O(l), H2(g), AgNO3(aq)->dissolved in water

Chemical equations from word equations

•  in chemistry 11, a solution means something is dissolved in water,      therefore the phase is aqueous
•  must include phase symbols and balance the equation
•  diatomic molecules: H2, N2, O2, F2, Cl2, Br2, I2
•  polyatomic molecules: P4, S8
•  a solution of barium phosphate is mixed with aqueous sodium sulphate to yield solid barium sulphate and aqueous sodium phosphate

                Ba3(PO4)2 (aq) + 3 Na2SO4 (aq) -> 3 BaSO4 (s) + 2 Na3PO4 (aq)

                                                                                                                           -Eva