Schrodinger's cloud model for electrons is an alternate theory to Bohr's orbit model. True or False

Which of the following is true about an object in free fall? its acceleration depends on its mass. it has no inertia. it pulls on earth, and earth pulls on it. its momentum is constant.

The long handle on a rake is a(n) a. lever b. screw c. wedge d. inclined plane

If the chemical properties of a substance remain unchanged and appearance or shape of a substance changes it is called a ?