Hi can someone help me with this i would really appreciate it

What forms when chemical reactions combine pollution with sunlight?

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

One does not belong why? ice, gold ,wood ,diamond and table salt