Who was the first person to propose that atoms existed

Asolution contains 225 g of sodium chloride, nacl, dissolved in enough water to make a 0.25 l of solution. what is the molarity of the solution? a. 3.88 m, b. 1.03 m, c. 1.5 m, d. 15.5 m

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

Summarize possible ways in which phases of matter could combine to form a solution.