Need help with chemistry problem

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

When a spring is compressed, the energy changes from kinetic to potential. which best describes what is causing this change?

Drug abuse will not lead to physical and psychological dependence. true or false ?