applied chemistry

1. Estimate the solubility of calcium carbonate at 25C in the presence of 0.09MCaCl2(aq). [7] 2. Will BaSO4 precipitate from a solution containing 1.5104MBa+2, barium ion, if enough soluble salt, Na2SO4, is added to make the solution 2.5104M in SO42 ? [7] 3. Describe oxidation reaction and use a rust of iron as an example. [5] 4. Describe the formation of a char coal. Motivate your answer with chemical reactions. [5] 5. List three possible disadvantages when a car owner replaces the manufacturer's recommended gasoline with methanol. [3]