200.0 mL of aqueous nitric acid is mixed with 300.0 mL of 0.200 M Mg(NO3)2 solution to give a solution with a nitrate ion concentration of 0.500 M. What is the concentration of the nitric acid

Joan writes four numbers on the board in standard form, and then she writes their scientific notation

Which description best characterizes the motion of particles in a solid?

Suppose that some of the compound spilled out of the crucible after it was heated. would that cause the percent by mass of water in the compound determined by the experiment to be too low, too high, or unchanged? briefly explain your answer.