What is the term for a solid changing to gas, and gas changing to solid, with out becomming a liquid?

What are the concentrations of hydroxide and hydronium ions in a solution with a ph of 10.2?

Look at the spectrums of a star moving towards earth and a motionless star. which of these is a correct inference that can be draw from the observation of the two spectrums? (2 points) the spectrum of a motionless star is difficult to be viewed separately using oridinary telescopes. the spectrum of a motionless star is identical to the spectrum of a star which moves towards earth. the spectrum of a star shifts towards the red region when the star moves towards earth. the spectrum of a star shifts towards the blue region when the star moves towards earth.

Areaction is first order with respect to reactant x and second order with respect to reactant y. which statement describes the rate law for this reaction?