Element X combines with oxygen to form an ionic compound: X2O and is a metal, to what group will X belong based on its charge. Could X be a transition metal? Why or why not?

Scientist wants to react a barium chloride salt with an acid. to speed up the reaction, the scientist crushes the barium chloride salt until it is a fine powder. this speeds up the reaction by a. increasing the ph of the salt. b. increasing the surface area of the salt. c. increasing the pressure of the salt. d. increasing the temperature of the salt. im thinking more a not 100% sure

In which phase(s) do the molecules take the shape of the container?

What are the similarities of physical and chemical change ?