1.9. Classify each of the following as a pure substance or a mixture; if a mixture, indicate whether it is homogeneous or heterogeneous: (a) rice pudding, (b) seawater, (c) magnesium, (d) gasoline. 1.12 Give the chemical symbols for the following elements: (a) carbon, (b) sodium (c) fluorine, (d) iron, (e) phosphorus, (f) argon, (g) nickel, [...]