I need help with my science work :)

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

How many moles of oxygen gas are produced from the decomposition of six moles of potassium chlorate

What is the area in square meters of 448 g ai foil that has a thickness of 23921 nm? the density is 2.70 g/cm