What happens to a sample of matter when it's particles lose kinetic energy?

Which formula can be used to calculate the molar mass of hydrogen peroxide

Which element has the lowest electronegativity? calcium(ca) gallium(ga) selenium(se) bromine(br)

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.