What is the lowest concentration of morphine that blocked naloxone binding, in standard notation?

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

Compare and contrast physical changes with chemical changes.

The ammonia molecule in the diagram has the observed bond orientation because