Write the formula equation from the word equation. Include physical states. Magnesium metal is placed into a hydrobromic acid solution, forming hydrogen gas and aqueous magnesium bromide. formula equation: When heated, solid calcium chlorate decomposes into solid calcium chloride and releases oxygen gas. formula equation: Solutions of barium bromide and sodium phosphate combine to form solid barium phosphate and aqueous sodium bromide. formula equation: Solutions of silver nitrate and aluminum iodide are mixed together, forming solid silver iodide and aqueous aluminum nitrate. formula equation: