Why do elements emit different flame colors

You are making a solution of calcium chloride dissolved in water. you add solid, stir, and it dissolves. you add just a spatula tip full, stir, and the solid does not dissolve. how could you describe the solutions before and after adding the spatula tip amount

Calculate the mass of silver needed to react with chlorine to produce 126g if silver chloride?

The biosphere of the earth is made up of what compound? organic or inorganic?