What distinguishes one element from another?

Here's one way to follow the scientific method. place the missing steps in the correct position in the process.

Membrane vesicles containing an internal sodium chloride (nacl) concentration of 0.14 m are placed into separate beakers each containing a different solution. the first beaker contains 0.14 m sucrose, while the second beaker contains 0.14 m calcium chloride (cacl2). the temperature is 25°c. what is the solute potential inside the vesicles, expressed in units of mpa?

What materials must dams have to produce electricity, and what must occur?